SpringMVC【入门】篇(转载自https://blog.csdn.net/qq_40181435/article/details/105599178)

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发布于 2020-06-11 16:40:16

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发布于 2020-06-11 16:40:16

文章被收录于专栏：用户6093955的专栏用户6093955的专栏用户6093955的专栏

对应视频教程：https://www.bilibili.com/video/BV1Sb411s7qa?p=1

SpringMVC第一篇

什么是SpringMVC？
- 概念 Spring MVC属于SpringFrameWork的后续产品，已经融合在Spring Web Flow里面。Spring 框架提供了构建 Web 应用程序的全功能 MVC 模块。使用 Spring 可插入的 MVC 架构，从而在使用Spring进行WEB开发时，可以选择使用Spring的Spring MVC框架或集成其他MVC开发框架，如Struts1(现在一般不用)，Struts 2(一般老项目使用)等。
- 三层框架
  - Model（模型）：数据模型，提供要展示的数据，因此包含数据和行为，可以认为是领域模型或 JavaBean 组件（包含数据和行为），不过现在一般都分离开来：Value Object（数据）和服务层（行为）。也就是模型提供了模型数据查询和模型数据的状态更新等功能，包括数据和业务。
  - View(视图)：负责进行模型的展示，一般就是我们见到的用户界面，客户想看到的东西。
  - Controller(控制器)：接收用户请求，委托给模型进行处理（状态改变），处理完毕后把返回的模型数据返回给视图，由视图负责展示。
- SpringMVC运行原理

SpringMVC入门
- 搭建开发环境
  - Tomcat下载及安装教程
  - 第一步，创建工程：正常创建maven工程，选择webapp（注意是maven下的）
  在这里插入图片描述
  - 第二步：创建之后再main下创建java和resources两个文件夹（我这里是直接创建文件夹类型就给定义好了，如果创建出来是普通的文件夹，可以右键文件夹选择Mark Directory as然后选择相应类型：java选择Sources Root，resources选择Resources Root ）
  在这里插入图片描述
  - 第三步：在pom.xml中添加依赖
  在这里插入图片描述
  - 第四步：配置web.xml文件（前端配置器）
  在这里插入图片描述
  - 第五步：在resources文件夹下创建配置文件
  在这里插入图片描述
- 编写入门程序
  - 首先在index.jsp文件中添加一个超链接标签用于跳转
  在这里插入图片描述
  - 然后新建一个controller类：方法返回值可做跳转页面的文件名
  在这里插入图片描述
  - 在springmvc.xml主配置文件中进行配置
  在这里插入图片描述
  在WEB-INF下创建文件夹pages，并在pages中创建跳转页面success.jsp
  在这里插入图片描述
  - 配置web.xml
  在这里插入图片描述
  - 开启tomcat运行测试，运行结果
  在这里插入图片描述
  运行原理解析
  在这里插入图片描述
补充：

 @RequestMapping
    /**
     * 作用：用于建立请求URL和处理请求方法之间的对应关系（及时能够响应index.jsp的超链接请求）
     * 作用范围：可以作用在方法上，也可以作用在类上   如：user/hello
     *
     * 属性：
     *      *name：用处不大*
     *      value：指定映射路径，作用与path相同
     *      path：指定映射路径，作用与value相同
     *      method：指定当前方法/类可以接收什么样的请求方式
     *          method = {RequestMethod.POST,RequestMethod.GET}
     *      params:指定限制请求参数的条件。它支持简单的表达式。要求请求的参数的key和value必须配置的一模一样
     *          如：params = {"accountName"}，则请求参数必须有accountName：如：<a href="user/hello？accountName=hehe">点击链接跳转</a>
     *             params = {"accountName=heihei"}，则请求参数必须是accountName=heihei：如：<a href="user/hello？accountName=heihei">点击链接跳转</a>
     *             params = {"money！100"}，表示请求参数中的money不能是100
     *      headers：用于指定限制请求消息头的条件
     *
     *      注意：
     *          以上属性只要出现2个或以上时，他们的关系是与关系
     */

请求参数的绑定（非常重要）

1. 请求参数邦定入门

/*param.jsp*/
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

<title>Title</title>

</head>

<body>

<a href="param/testParam?username=user&password=123456">请求参数绑定</a>

</body>

</html>

package it.mvc.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author: 东方老赢
 * @Date: 2020/4/19 14:18
 */
@Controller
@RequestMapping("param")
public class ParamController {

    @RequestMapping("testParam")
    public String testParam(String username,String password){
        System.out.println("执行了");
        System.out.println(username);
        System.out.println(password);
        return "success";
    }
}

运行结果

2. 请求参数绑定实体类型

//1.创建user实体类
package it.mvc.domain;
import java.io.Serializable;
/**


@Author: 东方老赢


@Date: 2020/4/19 14:42

*/

public class User implements Serializable {

private String uname;

private Integer age;
public String getUname() {

return uname;

}
public void setUname(String uname) {

this.uname = uname;

}
public Integer getAge() {

return age;

}
public void setAge(Integer age) {

this.age = age;

}
@Override

public String toString() {

return "User{" +

"uname='" + uname + ''' +

", age=" + age +

'}';

}

}

//2.创建Account实体类，并引用user实体类

package it.mvc.domain;

import java.io.Serializable;

/**
 * @Author: 东方老赢
 * @Date: 2020/4/19 14:32
 */
public class Account implements Serializable {
    private String username;
    private String password;

//    实体类中有引用实体类
    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "Account{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", user=" + user +
                '}';
    }
}

//在ParamController中创建方法，接受参数为实体类

 @RequestMapping("saveParam")
    public String saveParam(Account account){
        System.out.println("执行了");
        System.out.println(account);
        return "success";
    }

<%-- 使用表单提交的方式提交信息 --%>

<body>
<form action="param/saveParam" method="post">
    账户<input type="text" name="username"/><br/>
    密码<input type="text" name="password"/><br/>
<%--    实体类中有引用实体类的传参--%>
    姓名<input type="text" name="user.uname"/></br>
    年龄<input type="text" name="user.age"/></br>
    <input type="submit" value="提交">
</form>
</body>

测试结果：

在这里如果你输入中文就会发现控制台输出乱码，这时我们就要配置解决中文乱码的过滤器 在主配置文件web.xml中加入下列代码（==注意！！==要写在前端控制器之前，否则排列顺序不对，web-app标签会标红）

<!--配置解决中文乱码的过滤器-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

乱码问题就解决啦

3. 请求参数绑定集合类型

与上述步骤基本一致，这里只展示不同部分

//实体类中引用集合，添加get、set和toString方法
private List<User> list;

private Map<String,User> map;
<span class="token keyword">public</span> List<span class="token generics function"><span class="token punctuation">&lt;</span>User<span class="token punctuation">&gt;</span></span> <span class="token function">getList</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> list<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setList</span><span class="token punctuation">(</span>List<span class="token generics function"><span class="token punctuation">&lt;</span>User<span class="token punctuation">&gt;</span></span> list<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>list <span class="token operator">=</span> list<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> Map<span class="token generics function"><span class="token punctuation">&lt;</span>String<span class="token punctuation">,</span> User<span class="token punctuation">&gt;</span></span> <span class="token function">getMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> map<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMap</span><span class="token punctuation">(</span>Map<span class="token generics function"><span class="token punctuation">&lt;</span>String<span class="token punctuation">,</span> User<span class="token punctuation">&gt;</span></span> map<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>map <span class="token operator">=</span> map<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<form action="param/saveParam" method="post">
    账户<input type="text" name="username"/><br/>
    密码<input type="text" name="password"/><br/>
<%--    实体类中有集合传参--%>
    姓名<input type="text" name="list[0].uname"/></br>
    年龄<input type="text" name="list[0].age"/></br>
    姓名<input type="text" name="map['one'].uname"/></br>
    年龄<input type="text" name="map['one'].age"/></br>
    <input type="submit" value="提交">
</form>

运行结果

4.自定义类型转换器代码编写

问题：网页传参都是String格式，而SpringMVC在传参的过程中自动进行了类型转换，但是也有个别案例。
	如：默认可转换的日期格式为 yyyy/MM/dd，如果输入日期格式为 yyyy-MM-dd，则会报错

代码编写：（SpringMVC为我们提供了一个接口，用于我们自己编写转换代码）

1.在User实体类中加入Date属性，并添加get、set方法（此处就不展示了）

//2.创建字符串转化类
package it.mvc.utiles;
import org.springframework.core.convert.converter.Converter;
import java.text.DateFormat;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;
/**

@Author: 东方老赢
@Date: 2020/4/19 17:19

将字符串转换为指定格式日期

*/

public class StringToDateConverter implements Converter<String, Date> {

@Override

public Date convert(String s) {

if (s == null){

throw new RuntimeException("没有数据！！！");

}

DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

try {

return df.parse(s);

} catch (ParseException e) {

throw new RuntimeException("数据类型转换出现错误！！！");

}

}

}

<!--3.在主配置文件springmvc.xml文件中配置-->

<!--    配置自定义类型转换器-->
    <bean id="conversionServiceFactoryBean" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
<!--                配置路径-->
                <bean class="it.mvc.utiles.StringToDateConverter"></bean>
            </set>
        </property>
    </bean>

<!--    开启springmvc框架注解支持  手动开启类型转换-->
    <mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>

//4.添加转换方法

 @RequestMapping("StringToDate")
    public String StringToDate(User account){
        System.out.println("执行了");
        System.out.println(account);
        return "success";
    }

//5.表单提交测试
<form action="param/StringToDate" method="post">
    账户<input type="text" name="uname"/><br/>
    密码<input type="text" name="age"/><br/>
   生日 <input type="text" name="birthday"><br/>
    <input type="submit" value="提交">
</form>

运行通过说明你成功啦！

细节：怎么通过SpringMVC获取Servlet原生API

<%--1.编写超链接--%>
    <a href="param/getServlet">获取servlet原生API</a>

 /**
     * 2.获取Servlet原生API
     * @param request
     * @param response
     * @return
     */
    @RequestMapping("getServlet")
    public String getServlet(HttpServletRequest request, HttpServletResponse response){
        System.out.println("执行了");
        System.out.println(request);
    HttpSession session <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>session<span class="token punctuation">)</span><span class="token punctuation">;</span>

    ServletContext servletContext <span class="token operator">=</span> session<span class="token punctuation">.</span><span class="token function">getServletContext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>servletContext<span class="token punctuation">)</span><span class="token punctuation">;</span>

    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

运行结果：

常用注解？
@RequestParam()

作用：把请求中指定名称的参数给控制器形参赋值（即网页传参名称与方法中参数名不一致时可用）属性：

value：请求参数中的名称
required：请求参数中是否必须提供此参数。默认值为true。表示必须提供，不提供会出错

<a href="anno/testRequestParam?name=haha">testRequestParam</a>

  @RequestMapping("/testRequestParam")
    public String testRequestParam(String username){
        System.out.println(username);
        return "success";
    }

运行结果：

细节：当添加了注解之后，网页传参的参数名称必须与注解中的一致，否则会报错

@RequestBody()

作用：用于获取请求体内容。直接使用得到的是 key=value&key=value结构的数据（get方式不适用）属性：

required：是否必须有请求体，默认为true。当取值为true时，get请求方式会报错。如果取值为false，get请求得到的是null

<form action="anno/testRequestBody" method="post">
    用户：<input type="text" name="username"><br/>
    密码：<input type="text" name="password"><br/>
    <input type="submit" value="提交">
</form>

 @RequestMapping("/testRequestBody")
    public String testRequestBody(@RequestBody String body){
        System.out.println(body);
        return "success";
    }

运行结果：

@PathVariable()

作用：用于绑定url中的占位符。例如：请求url中/delete/{id}，这个{id}就是占位符。（url支持占位符是spring3.0之后加入的，是springmvc支持restful风格url的一个重要标志）属性：

value：用于指定url中占位符的位置
required：是否必须提供占位符

<a href="anno/testPathVariable/10">testPathVariable</a>

 @RequestMapping("/testPathVariable/{sid}")
    public String testPathVariable(@PathVariable(name = "sid") String id){
        System.out.println(id);
        return "success";
    }

运行结果：

HiddenHttpMethodFilter过滤器

作用：由于浏览器form表单只支持get与post请求，而default、put等method并不支持，spring3.0添加了一个过滤器，可以将浏览器请求改为指定的请求方式，发送给我们的控制器方法，使得支持get、post、put与delete请求
使用方法：
- 第一步：在web.xml中设置过滤器
- 第二步：请求方式必须使用post请求
- 第三步：按照要求提供_method请求参数，该参数的取值就是我们需要的请求方式
@RequestHeader()（用处不大）

作用：用于获取请求消息头属性：

value：提供消息头名称
required：是否必须有此消息头

注：使其开发中一般不用

<a href="anno/testRequestHeader">testRequestHeader</a>

 @RequestMapping("/testRequestHeader")
    public String testRequestHeader(@RequestHeader(value = "Accept") String header){
        System.out.println(header);
        return "success";
    }

运行结果

@CookieValue()（用的也较少）

作用：用于把指定cookie名称的值传入控制器方法参数属性：

value：指定cookie的名称
required：是否必须有cookie

<a href="anno/testCookieValue">testCookieValue</a>

 @RequestMapping("/testCookieValue")
    public String testCookieValue(@CookieValue(value = "JSESSIONID") String cookie){
        System.out.println(cookie);
        return "success";
    }

运行结果：

@ModelAttribute()‘’

作用：该注解是springmvc4.3版本之后加入的，他可以用于修饰方法和参数

出现在方法上：表示当前方法会在控制器执行之前执行。它可以修饰没有返回值的方法，也可以修饰有具体返回值的方法
出现在参数上，获取指定的数据给参数赋值

属性：

value：用于获取数据的key。key可以是POJO的属性名称，也可以是map结构的key

应用场景：

当表单提交数据不是完整的实体类数据时，保证没有提交数据的字段使用数据库对象原来的数据例如：我们在编辑一个用户时，用户有一个创建信息的字段，该字段的值是不允许被修改的。在提交表单数据是肯定没有此字段的内容，一旦更新会把该字段内容置为null，此时就可以使用此注解解决问题

<form action="anno/testModelAttribute" method="post">
    用户：<input type="text" name="uname"><br/>
    密码：<input type="text" name="age"><br/>
    <input type="submit" value="提交">
</form>

  @RequestMapping("/testModelAttribute")
        public String testModelAttribute(User user){
            System.out.println(user);
            return "success";
        }
<span class="token comment">/**
 * 该方法会先执行，与表单提交重复的内容会被表单覆盖，表单没有的内容原封不动的传上去
 * @param uname
 * @return
 */</span>
<span class="token annotation punctuation">@ModelAttribute</span>
    <span class="token keyword">public</span> User <span class="token function">showUser</span><span class="token punctuation">(</span>String uname<span class="token punctuation">)</span><span class="token punctuation">{</span>
        System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"showUser执行了"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//通过用户名查询数据库（模拟）</span>
        User user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        user<span class="token punctuation">.</span><span class="token function">setUname</span><span class="token punctuation">(</span>uname<span class="token punctuation">)</span><span class="token punctuation">;</span>
        user<span class="token punctuation">.</span><span class="token function">setAge</span><span class="token punctuation">(</span><span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        user<span class="token punctuation">.</span><span class="token function">setBirthday</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> user<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

 @RequestMapping("/testModelAttribute")
        public String testModelAttribute(@ModelAttribute("abc") User user){
            System.out.println(user);
            return "success";
        }

    /**
     * 未带参数的方法需要添加到 map中
     * @param uname
     * @param map
     */
    @ModelAttribute
    public void showUser(String uname, Map<String,User> map){
        System.out.println("showUser执行了");
        //通过用户名查询数据库（模拟）
        User user = new User();
        user.setUname(uname);
        user.setAge(20);
        user.setBirthday(new Date());
        map.put("abc",user);
    }

运行效果：表单只提交了两项，覆盖掉了showUser（）方法中的相同参数的两项，方法中未重复的日期参数则会原封不动的传上去

@SessionAttributes()

作用：用于多次执行控制器方法间的参数共享属性：

value：用于指定存入的属性名称
type：用于指定存入的数据类型

    /**
     * 存入session
     * @param model
     * @return
     */
    @RequestMapping("/testSessionAttributes")
    public String testSessionAttributes(Model model){
        model.addAttribute("msg","东方老赢");
        return "success";
    }
<span class="token comment">/**
 * 获取session
 * @return
 */</span>
<span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/getSessionAttributes"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> String <span class="token function">getSessionAttributes</span><span class="token punctuation">(</span>ModelMap modelmap<span class="token punctuation">)</span><span class="token punctuation">{</span>
    String msg <span class="token operator">=</span> <span class="token punctuation">(</span>String<span class="token punctuation">)</span> modelmap<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">"msg"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * 删除session
 * @return
 */</span>
<span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/delSessionAttributes"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> String <span class="token function">delSessionAttributes</span><span class="token punctuation">(</span>SessionStatus status<span class="token punctuation">)</span><span class="token punctuation">{</span>
    status<span class="token punctuation">.</span><span class="token function">setComplete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<a href="anno/testSessionAttributes">testSessionAttributes</a>
<a href="anno/getSessionAttributes">getSessionAttributes</a>
<a href="anno/delSessionAttributes">delSessionAttributes</a>

运行：

SpringMVC第二篇

响应数据和结果视图
- 返回值分类

 /**
     * 使用Model
     * @param model
     * @return
     */
    @RequestMapping("/testModel")
    public String testModel(Model model){
        User user = new User();
        user.setUsername("东方老赢");
        user.setPassword("123456");
        user.setAge(20);
        model.addAttribute(user);
        return "success";
    }
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<span class="token comment">/**
 * 使用jsp
 */</span>
<span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/testVoid"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">testVoid</span><span class="token punctuation">(</span>HttpServletRequest request<span class="token punctuation">,</span> HttpServletResponse response<span class="token punctuation">)</span> <span class="token keyword">throws</span> ServletException<span class="token punctuation">,</span> IOException <span class="token punctuation">{</span>
    <span class="token comment">//编写请求转发的程序</span>

//        request.getRequestDispatcher("/WEB-INF/pages/success.jsp").forward(request,response);


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    <span class="token comment">//重定向(重定向无法请求/WEB-INF/pages中的jsp文件)</span>

//        response.sendRedirect(request.getContextPath()+"/response.jsp");


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    <span class="token comment">//设置中文乱码</span>
    response<span class="token punctuation">.</span><span class="token function">setCharacterEncoding</span><span class="token punctuation">(</span><span class="token string">"UTF-8"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    response<span class="token punctuation">.</span><span class="token function">setContentType</span><span class="token punctuation">(</span><span class="token string">"text/html;charset=UTF-8"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token comment">//直接会进行响应</span>
    response<span class="token punctuation">.</span><span class="token function">getWriter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span><span class="token string">"东方老赢"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment">/**
 * 使用ModelAndView
 */</span>
<span class="token annotation punctuation">@RequestMapping</span><span class="token punctuation">(</span><span class="token string">"/testModelAndView"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> ModelAndView <span class="token function">testModelAndView</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    ModelAndView mv <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ModelAndView</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    User user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    user<span class="token punctuation">.</span><span class="token function">setUsername</span><span class="token punctuation">(</span><span class="token string">"东方老赢"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    user<span class="token punctuation">.</span><span class="token function">setPassword</span><span class="token punctuation">(</span><span class="token string">"123456"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    user<span class="token punctuation">.</span><span class="token function">setAge</span><span class="token punctuation">(</span><span class="token number">20</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    mv<span class="token punctuation">.</span><span class="token function">addObject</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
    mv<span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"success"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> mv<span class="token punctuation">;</span>
<span class="token punctuation">}</span>


SpringMVC框架提供的转发和重定向
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    @RequestMapping("/testForwardOrRedirect")
    public String testForwardOrRedirect(){
        //请求的转发
//        return "forward:/WEB-INF/pages/success.jsp";
        //重定向
        return "redirect:/response.jsp";
    }

SpringMVC框架提供的转发和重定向

 @RequestMapping("/testForwardOrRedirect")
    public String testForwardOrRedirect(){
        //请求的转发
//        return "forward:/WEB-INF/pages/success.jsp";
        //重定向
        return "redirect:/response.jsp";
    }

在webapp下创建js文件夹，导入jquery.min.js
在这里插入图片描述
导入json需要的jar包

<!--    json字符串与Javabean对象相互转换过程中，需要用到jackson的jar包-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.0</version>
    </dependency>

编写JavaScript代码

<script src="js/jquery.min.js"></script>
    <script>
        // 页面加载，绑定单击事件
        $(function () {
            $("#btn").click(function () {
                //ajax异步请求
                $.ajax({
                    url:"user/testAjax",
                    contentType:"application/json;charset=UTF-8",
                    data:'{"username":"东方老赢","password":"123456","age":"22"}',
                    dataType:"json",
                    type:"post",
                    success:function (data) {
                        //data服务器端响应的json数据，进行解析
                        alert(data);
                        alert(data.username);
                        alert(data.password);
                        alert(data.age);
                    }
                })
            });
        });
    </script>

编写controller代码，模拟服务器响应

/**
     * @RequestBody：服务器接收到的json格式的数据解析成实体类型
     * @ResponseBody：服务器响应时将返回的数据解析成json格式
     *
     * @param user
     * @return
     */
    @RequestMapping("/testAjax")
    public @ResponseBody User testAjax(@RequestBody User user){
        //客户端发送ajax请求，传的是ajax字符串，后端把json字符串封装到user对象中
        System.out.println(user);
        //做响应，模拟查询数据库
        user.setUsername("东方老赢");
        user.setPassword("654321");
        user.setAge(25);
        return user;
    }

SpringMVC实现文件上传
- 文件上传的回顾
- 文件上传的必要前提：
1. form表单的enctype取值必须是：multipart/form-data（enctype：是表单请求正文的类型）
2. method的属性取值必须是Post
3. 提供一个文件选择域 <input type=“ file ”/>
- 文件上传的原理分析：当form表单的enctype取值不是默认值之后，request.getParameter( ) 将失效 enctype = “application/x-www-from-urlencoded”（即默认值）时，form表单的正文内容是：
  - key = value&key = value&key = value
  当form表单的enctype取值为 multipart/form-data 时，请求正文的内容就变成
  - 每一部分都是MIME类型描述的正文 ================================7de1a433602ac 分界符 Content- Disposition:form-data;name=“userName” 协议头 aaaa 协议正文 ================================7de1a433602ac 分界符 Content- Disposition : form-data ; name = “file”;filename = “C:\xxx\xxx\b.txt” Content-Type：text/plain 协议类型（MIME类型） bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb ================================7de1a433602ac
借助第三方组件实现文件上传： commons-fileupload-x.x.x.jar、commons-io-x.x.jar
- SpringMVC传统方式文件上传

<dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

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 <form action="user/fileupload1" method="post" enctype="multipart/form-data">
        浏览文件<input type="file" name="upload"/><br/>
        <input type="submit" value="上传"/>
    </form>

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  @RequestMapping("/fileupload1")
    public String fileupload1(HttpServletRequest request) throws Exception {
        System.out.println("成功执行 传统文件上传");
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    <span class="token comment">//使用fileupload组件完成文件上传</span>
    <span class="token comment">//上传的位置</span>
    String path <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getServletContext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getRealPath</span><span class="token punctuation">(</span><span class="token string">"/uploads/"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//判断该路径是否存在</span>
    File file <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//不存在则创建该文件夹（在工程target文件夹下）</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>file<span class="token punctuation">.</span><span class="token function">exists</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        file<span class="token punctuation">.</span><span class="token function">mkdirs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">//解析request对象，获取上传文件项</span>
    DiskFileItemFactory factory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DiskFileItemFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    ServletFileUpload upload <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServletFileUpload</span><span class="token punctuation">(</span>factory<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//解析requesth得到一个list集合</span>
    List<span class="token generics function"><span class="token punctuation">&lt;</span>FileItem<span class="token punctuation">&gt;</span></span> items <span class="token operator">=</span> upload<span class="token punctuation">.</span><span class="token function">parseRequest</span><span class="token punctuation">(</span>request<span class="token punctuation">)</span><span class="token punctuation">;</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>items<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//遍历</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span>FileItem item <span class="token operator">:</span> items<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//进行判断，当前item对象是否是上传文件项</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>item<span class="token punctuation">.</span><span class="token function">isFormField</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//为true，书名普通表单项</span>
            System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"普通表单项"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
            <span class="token comment">//为false说明上传文件项</span>
            <span class="token comment">//获取上传文件的名称</span>
            System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"上传文件项"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            String name <span class="token operator">=</span> item<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//完成文件上传</span>
            item<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>path<span class="token punctuation">,</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//删除临时文件</span>
            item<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

SpringMVC跨服务器方式文件上传

添加jar包

<!--    允许跨服务器上传文件-->
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-core</artifactId>
      <version>1.18.1</version>
    </dependency>
    <dependency>
      <groupId>com.sun.jersey</groupId>
      <artifactId>jersey-client</artifactId>
      <version>1.18.1</version>
    </dependency>
  </dependencies>
添加新表单

添加新表单

<form action="user/fileupload3" method="post" enctype="multipart/form-data">
        浏览文件<input type="file" name="upload"/><br/>
        <input type="submit" value="Springmvc跨服务器文件上传"/>
    </form>

创建新工程模拟图片服务器，并部署tomcat测试是否成功
在这里插入图片描述
在这里插入图片描述
Controller代码

@RequestMapping("/fileupload3")
    public String fileupload3(MultipartFile upload) throws Exception {
        System.out.println("成功执行 Springmvc跨服务器文件上传");
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    String path <span class="token operator">=</span> <span class="token string">"http://localhost:9090/fileupload_war/uploads/"</span><span class="token punctuation">;</span>
    <span class="token comment">//获取上传文件的名称</span>
    String name <span class="token operator">=</span> upload<span class="token punctuation">.</span><span class="token function">getOriginalFilename</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//创建客户端的对象</span>
    Client client <span class="token operator">=</span> Client<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//和图片服务器进行连接</span>
    WebResource webResource <span class="token operator">=</span> client<span class="token punctuation">.</span><span class="token function">resource</span><span class="token punctuation">(</span>path<span class="token operator">+</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">//完成文件上传</span>
    webResource<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>upload<span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

运行测试即可

细节：Tomcat默认不能进行delete和put，需要修改 readonly 属性；具体教程

SpringMVC的异常处理
- 异常处理思路
Controller调用service，service调用dao，异常都是向上抛出的，最终有DispatcherServlet找异常处理器进行一场的处理

package com.mvc.exception;
/**




@Author: 东方老赢




@Date: 2020/4/23 11:02

*/

public class SysException extends Exception {


//存储提示信息

private String message;


@Override

public String getMessage() {

return message;

}


public void setMessage(String message) {

this.message = message;

}


public SysException(String message) {

this.message = message;

}

}

编写异常处理器

package com.mvc.exception;
import org.springframework.web.servlet.HandlerExceptionResolver;

import org.springframework.web.servlet.ModelAndView;


import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**

*




异常处理器





@Author: 东方老赢




@Date: 2020/4/23 12:02

*/

public class SysExceptionResolver implements HandlerExceptionResolver {

@Override

public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {

//获取到异常对象

SysException sysException = null;

if (e instanceof SysException){

sysException = (SysException) e;

}else {

sysException = new SysException("系统正在维护。。。");

}


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 <span class="token comment">//创建ModelAndView对象</span>
 ModelAndView mv <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ModelAndView</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 mv<span class="token punctuation">.</span><span class="token function">addObject</span><span class="token punctuation">(</span><span class="token string">"errorMsg"</span><span class="token punctuation">,</span>sysException<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 mv<span class="token punctuation">.</span><span class="token function">setViewName</span><span class="token punctuation">(</span><span class="token string">"error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token keyword">return</span> mv<span class="token punctuation">;</span>

}

}

配置异常处理器

<!--    配置异常处理器-->
    <bean id="sysExceptionResolver" class="com.mvc.exception.SysExceptionResolver"></bean>

SpringMVC中的拦截器
- 拦截器的作用
SpringMVX中的拦截器类似于Servlet中的过滤器Filter，用于对处理器进行预处理和后处理谈到拦截器，还要提一个词——拦截器链（Interceptor Chain）。拦截器链就是将拦截器按一定顺序联结成一条链。在访问被拦截的方法和字段之时，拦截器链中的拦截器就会按其之前定义的顺序被调用拦截器预过滤器的区别：
- 过滤器是servlet规范中的一部分，任何java web工程都可以用
- 拦截器是SpringMVC框架自己的，只有使用了SpringMVC框架的工程才能使用
- 过滤器在url-patten 中配置 /* 之后，可以对所有要访问的资源进行拦截。
- 拦截器只会拦截访问的控制器的方法，如果访问的是 jsp、html、css、image或者js是不会进行拦截的
- 细节：他也是AOP思想的具体应用
- 想要自定义拦截器，必须要求实现：HandlerInterceptor接口

package com.mvc.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;


import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


/**




@Author: 东方老赢




@Date: 2020/4/23 18:01

*/

public class MyIntercepter1 implements HandlerInterceptor {


/**



预处理，controller方法执行前

return true:放行，执行下一个拦截器。如果没有，执行conroller方法

return false：不放行


@param request

@param response

@param handler

@return

@throws Exception

*/

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

System.out.println("Interceptor运行成功");

return true;

}

}

配置拦截器（springmvc.xml）

<!--配置拦截器-->
    <mvc:interceptors>
    <!--配置单个拦截器-->
        <mvc:interceptor>
        <!--要拦截的具体方法
                path = /user/* 表示拦截当前类下的所有方法
                path = /**  表示拦截所有方法-->
            <mvc:mapping path="/user/*"/>
                <!--不要拦截的方法-->
            <!--<mvc:exclude-mapping path=""/>-->
                <!--配置拦截器对象-->
            <bean class="com.mvc.interceptor.MyIntercepter1"></bean>
        </mvc:interceptor>
    </mvc:interceptors>

运行测试

拦截器中的方法

1.preHandle：是controller方法执行之前拦截的方法

可以使用request或者response跳转到指定页面
return true放行，执行下一个拦截器，如果没有拦截器，则直接执行controller中的方法
return false 不放行，不会执行controller中的方法

2.postHandle：是controller方法执行后执行的方法，在JSP视图执行前

可以使用request或者response跳转到指定页面
如果指定了跳转的页面，那么controller方法跳转的页面将不会显示

3.postHandle：是在JSP执行后执行

request或者response不能再跳转页面了

第三篇重头戏：SSM整合

搭建整合环境
- 整合说明：SSM整合可以用多种形式，这里选用XML+注解方式
在这里插入图片描述

1.首先创建一个数据库

CREATE TABLE ssm(
	    id  INT PRIMARY KEY AUTO_INCREMENT,
	    NAME VARCHAR(20),
	    money DOUBLE
	);

2.创建Maven工程，导包

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.version>5.0.2.RELEASE</spring.version>
    <mysql.version>5.1.6</mysql.version>
    <mybatis.version>3.4.5</mybatis.version>
  </properties>
<dependencies>

<!--    spring-->

<!--AOP相关技术-->

<dependency>

<groupId>org.aspectj</groupId>

<artifactId>aspectjweaver</artifactId>

<version>1.6.8</version>

</dependency>


Copy
  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>AOPjar包<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>aop<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>context容器<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>context<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>mvc相关jar包<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>web<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>webmvc<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>单元测试<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>test<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>事务<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>tx<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>JDBC技术<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>jdbc<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>spring<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>单元测试<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>junit<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>junit<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">4.11</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>compile<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>Mysql驱动jar包<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>mysql<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>mysql<span class="token operator">-</span>connector<span class="token operator">-</span>java<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>mysql<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>Servlet相关jar包<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>javax<span class="token punctuation">.</span>servlet<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>servlet<span class="token operator">-</span>api<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">2.5</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>provided<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>javax<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>jsp<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>jsp<span class="token operator">-</span>api<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">2.0</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>provided<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>页面 el、jstl表达式<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>jstl<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>jstl<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">1.2</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

<!--      log  strat-->

<dependency>

<groupId>log4j</groupId>

<artifactId>log4j</artifactId>

<version>1.2.17</version>

</dependency>

<dependency>

<groupId>org.slf4j</groupId>

<artifactId>slf4j-log4j12</artifactId>

<version>1.7.12</version>

</dependency>

<!--      log  end-->


Copy
  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>Mybatis相关jar包组件<span class="token operator">--</span><span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>mybatis<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>mybatis<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span>$<span class="token punctuation">{</span>mybatis<span class="token punctuation">.</span>version<span class="token punctuation">}</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>spring整合mybatis所需jar包<span class="token operator">--</span><span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>mybatis<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>mybatis<span class="token operator">-</span>spring<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">1.3</span><span class="token number">.0</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

  <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>数据库连接池：c3p0<span class="token operator">--</span><span class="token operator">&gt;</span>
  <span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>c3p0<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>c3p0<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">0.9</span><span class="token number">.1</span><span class="token number">.1</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>type<span class="token punctuation">&gt;</span></span>jar<span class="token operator">&lt;</span><span class="token operator">/</span>type<span class="token operator">&gt;</span>
      <span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>compile<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
  <span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

</dependencies>

3.搭建环境

Spring框架代码的编写
配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--    开启注解扫描 只需要处理service和dao-->

<context:component-scan base-package="com.ssm">

<!--        配置哪些注解不扫描-->

<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>

</context:component-scan>

</beans>

package com.ssm.service.impl;
import com.ssm.dao.IAccountDao;

import com.ssm.domain.Account;

import com.ssm.service.IAccountService;

import org.springframework.stereotype.Service;


import java.util.List;


/**



账户业务层


@Author: 东方老赢

@Date: 2020/4/24 9:29

*/


@Service("accountService")

public class AccountServiceImpl implements IAccountService {

@Override

public List<Account> findAll() {

System.out.println("业务层，查询所有。。。");

return null;

}


Copy
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">saveAccount</span><span class="token punctuation">(</span>Account account<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"业务层，保存账户。。。"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}


Copy
package com.ssm.test;

import com.ssm.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @Author: 东方老赢
 * @Date: 2020/4/24 9:46
 */
public class TestSpring {

    @Test
    public void run1(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("SpringConfig.xml");
        IAccountService accountService = (IAccountService) ac.getBean("accountService");
        accountService.findAll();
    }
}

Spring整合SpringMVC框架
- 首先编写SpringMVC框架（详情见上）
  - 细节：springmvc.xml配置注解扫描

<!--    开启注解扫描，只扫描Controller注解-->
    <context:component-scan base-package="com.ssm">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

<!--  配置spring的监听器，默认只加载WEB-INF目录下的配置文件-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--  但是由于SpringConfig.xml配置文件不在WEB-INF目录下，所以需要指定路径-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:SpringConfig.xml</param-value>
  </context-param>
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package com.ssm.controller;
import com.ssm.service.IAccountService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;


/**




账户web





@Author: 东方老赢




@Date: 2020/4/24 9:30

*/

@Controller

@RequestMapping("/account")

public class AccountController {


@Autowired

private IAccountService accountService;


@RequestMapping("/findAll")

public String findAll(){

System.out.println("表现层：查询所有。。。");

accountService.findAll();

return "success";

}

}

运行结果

Spring整合Mybatis框架
首先编写Mybatis框架，详情见：如果你读完这篇文章，恭喜你！你的Mybatis入门了！
测试通过后开始整合（在SpringConfig.xml中整合）

--Spring整合Mybatis框架-->
    <!--配置连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
    <!--配置SqLSessionFactory工厂-->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
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<span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>配置AccountDao接口所在包<span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token operator">&lt;</span>bean id<span class="token operator">=</span><span class="token string">"mapperScannerConfigurer"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"org.mybatis.spring.mapper.MapperScannerConfigurer"</span><span class="token operator">&gt;</span>
    <span class="token operator">&lt;</span>property name<span class="token operator">=</span><span class="token string">"basePackage"</span> value<span class="token operator">=</span><span class="token string">"com.ssm.dao"</span><span class="token operator">&gt;</span><span class="token operator">&lt;</span><span class="token operator">/</span>property<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>bean<span class="token operator">&gt;</span>

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package com.ssm.dao;

import com.ssm.domain.Account;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Author: 东方老赢
 * @Date: 2020/4/24 9:25
 */
@Repository
public interface IAccountDao {
    @Select("select * from ssm")
    List<Account> findAll();

    @Select("insert into ssm(name,money) values(#{name},#{money})")
    void saveAccount(Account account);
}

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package com.ssm.service.impl;

import com.ssm.dao.IAccountDao;
import com.ssm.domain.Account;
import com.ssm.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 账户业务层
 *
 * @Author: 东方老赢
 * @Date: 2020/4/24 9:29
 */

@Service("accountService")
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;

    @Override
    public List<Account> findAll() {
        System.out.println("业务层，查询所有。。。");
        return accountDao.findAll();
    }

    @Override
    public void saveAccount(Account account) {
        System.out.println("业务层，保存账户。。。");
        accountDao.saveAccount(account);
    }
}

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package com.ssm.controller;

import com.ssm.domain.Account;
import com.ssm.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

/**
 * 账户web
 *
 * @Author: 东方老赢
 * @Date: 2020/4/24 9:30
 */
@Controller
@RequestMapping("/account")
public class AccountController {

    @Autowired
    private IAccountService accountService;

    @RequestMapping("/findAll")
    public String findAll(Model model){
        System.out.println("表现层：查询所有。。。");
        List<Account> list = accountService.findAll();
        model.addAttribute("list",list);
        return "success";
    }
}

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<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    成功
    <c:forEach items="${list}" var="account">
        ${account.name}
        ${account.money}
    </c:forEach>
</body>
</html>

运行结果：