SSM整合步骤

HUC思梦

发布于 2020-09-03 16:01:55

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发布于 2020-09-03 16:01:55

文章被收录于专栏：HUC思梦的java专栏HUC思梦的java专栏

第一步：mybatis和spring整合

mybatis-spring-1.2.2：是mybatis官方出的包：

mybatis的包：

mybatis和spring的整合包：

spring及springmvc的包：

Dao

Spring配置文件：

applicationContext.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
    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-3.1.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.1.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">

    <!-- 引用配置文件 此处使用的是dbcp连接池-->
    <context:property-placeholder location="classpath:db.properties" />  
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${mysql.driver}" />
        <property name="url" value="${mysql.url}" />
        <property name="username" value="${mysql.username}" />
        <property name="password" value="${mysql.password}" />
        <property name="maxActive" value="30" />
        <property name="maxIdle" value="5" />
    </bean>
</beans>

applicationContext-dao.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
    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-3.1.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.1.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">
   
   <!-- 会话工厂 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 加载mybatis的配置文件 -->
        <property name="configLocation" value="classpath:mybatis/sqlMapConfig.xml"></property>
    </bean>

    <!-- mapper扫描器，这里由于没有在sqlMapConfig配置mapper，所以必须保证mapper和dao接口在同一个目录且同名 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="yycg.**.dao.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> 
    </bean>
   
   <!-- 如果采用自动扫描器则不用手动设置工厂bean
    <bean id="useryyMapper2" class="org.mybatis.spring.mapper.MapperFactoryBean">  
       <property name="mapperInterface"  
           value="yycg.dao.mapper.UserMapper" />  
       <property name="sqlSessionFactory" ref="sqlSessionFactory" />  
  </bean> -->
   
   
</beans>

sqlmapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

<!—使用自动扫描器时，mapper.xml文件如果和mapper.java接口在一个目录则此处不用定义mappers -->
<mappers>
  <package name="cn.itcast.mybatis.mapper" />
</mappers>
</configuration>

Mapper编写的三种方法

接口实现类继承SqlSessionDaoSupport

使用此种方法需要编写mapper接口，mapper接口实现类、mapper.xml文件

1、在sqlMapConfig.xml中配置mapper.xml的位置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

<mappers>
     <!-- 通过resource扫描user.xml -->
    <mapper resource="cn/itcast/ssm/dao/old/User.xml"/>
      <!-- 扫描 cn.itcast.ssm.dao.mapper包下的mapper接口 -->
    <package name="cn.itcast.ssm.dao.mapper" />   
</mappers>

</configuration>

2、定义mapper接口

3、实现类继承了SqlSessionDaoSupport

mapper方法中可以this.getSqlSession()进行数据增删改查。

4、 spring 配置

<!-- mybatis运行环境 -->
<!-- 配置会话工厂，由spring管理 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <!-- mybatis全局配置文件 -->
    <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
</bean>

<!-- 原始编写dao的方法 -->
<bean id="userDao" class="cn.itcast.ssm.dao.old.UserDaoImpl">
   <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

使用org.mybatis.spring.mapper.MapperFactoryBean

1、在sqlMapConfig.xml中配置mapper.xml的位置

如果mapper.xml和mappre接口的名称相同且在同一个目录，这里可以不用配置

2、定义mapper接口

注意

1)、mapper.xml中的namespace为mapper接口的地址

2)、mapper接口中的方法名和mapper.xml中的定义的statement的id保持一致

3、 Spring中定义

<!-- 通过代理对象方法生成mapper实现对象
此种方法需要每个mapper进行配置，麻烦，不使用此方法
 -->
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
   <!-- 指定mapper地址 -->
   <property name="mapperInterface"   value="cn.itcast.ssm.dao.mapper.UserMapper" />  
   <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
</bean>

使用mapper扫描器

1、 mapper.xml文件编写，

注意：

mapper.xml中的namespace为mapper接口的地址

mapper接口中的方法名和mapper.xml中的定义的statement的id保持一致

如果将mapper.xml和mapper接口的名称保持一致则不用在sqlMapConfig.xml中进行配置

2、定义mapper接口

注意mapper.xml的文件名和mapper的接口名称保持一致，且放在同一个目录

3、配置mapper扫描器

<!-- 使用mapper自动扫描器 
自动将mapper包中的mapper扫描出来，注册到spring容器中，bean的id是mapper的类名(第一个字母小写)
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
   <!-- 指定mapper扫描的包 -->
   <property name="basePackage" value="cn.itcast.ssm.dao.mapper"></property>
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>

4、使用扫描器后从spring容器中获取mapper的实现对象

扫描器将接口通过代理方法生成实现对象，要spring容器中自动注册，名称为mapper 接口的名称

Service

UserManager接口

编写UserManagerService接口，如下：

public interface UserManagerService {

    /**
     * 根据id查询用户
     */
    public User findUserById(String id) throws Exception;
}

public class UserManagerServiceImpl implements UserManagerService {

    @Autowired
    UserMapper userMapper;
    
    @Override
    public User findUserById(int id) throws Exception {
        return userMapper.selectUserById(id);
    } 

}

Spring配置文件：

将userManager在spring配置文件进行配置

applicationContext--service.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
    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-3.1.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.1.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">

    <!-- 用户管理-->
    <bean id="userManagerService" class="cn.itcast.mybatis.service.impl.UserManagerServiceImpl" />
   
</beans>

Serivce测试：

ApplicationContext applicationContext;
    
    protected void setUp() throws Exception {
        applicationContext = new ClassPathXmlApplicationContext(
                new String[]{
                        "spring/applicationContext.xml",
                        "spring/applicationContext-dao.xml",
                        "spring/applicationContext-service.xml"
                }
                );
        
    }
    public void testFindUserById() throws Exception {
        UserManagerService userManagerService = (UserManagerService)applicationContext.getBean("userManagerService");
        System.out.println(userManagerService.findUserById(1));
    }

事务控制：

配置

在applicaitonContext.xml中配置事务管理器

<!-- 事务控制 -->
    <bean id="txManager-base"
    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <tx:advice id="txAdvice-base" transaction-manager="txManager-base">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="get*" read-only="true" />
            <tx:method name="select*" read-only="true" />
            <tx:method name="find*" read-only="true" />
        </tx:attributes>
    </tx:advice>

    <aop:config proxy-target-class="true">
        <aop:advisor
            pointcut="execution(* cn.itcast.**.service.impl.*.*(..))"
            advice-ref="txAdvice-base" />
    </aop:config>

事务测试

在一个service方法中先执行更新，再执行插入，插入一个违反唯一约束的记录，如果数据不回滚则说明事务没有控制。

Action

spingmvc.xml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:mvc="http://www.springframework.org/schema/mvc"
    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-3.1.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.1.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">

   
    <!-- 注解驱动 --> 
    <mvc:annotation-driven/>
    <!-- 组件扫描，用于控制层 -->
    <context:component-scan base-package="cn.itcast.mybatis.action" />
    
    <!-- 视图解析器 -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
        
    <!-- 拦截器 -->
    <!-- <mvc:interceptors>
        多个拦截器,顺序执行
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <bean class="cn.itcast.project.yycg.base.filter.LoginInterceptor"></bean>
        </mvc:interceptor>
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <bean class="cn.itcast.project.yycg.base.filter.PermissionInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors> -->
    
    
</beans>

编写UserAction.java

/**
 * 用户管理
 * @author Thinkpad
 *
 */
@Controller
@RequestMapping("/user")
public class UserAction {
    
    @Autowired
    UserManagerService userManagerService;
    
    /**
     * 用户修改
     * @param model
     * @param id
     * @return
     * @throws Exception
     */
    @RequestMapping("/useredit")
    public String useredit(Model model,int id)throws Exception{
        User user = userManagerService.findUserById(id);
        model.addAttribute("user", user);
        return "useredit";
    }
    /**
     * 用户修改提交
     * @param user
     * @return
     * @throws Exception
     */
    @RequestMapping("/usereditsubmit")
    public String usereditsubmit(User user)throws Exception{
        userManagerService.saveUser(user);
        return "success";
    }

//其它方法略
//……

}

注意：学会如果在action中调用service，处理结果返回用户。

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>mybatis_03</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/spring/applicationContext.xml,/WEB-INF/classes/spring/applicationContext-*.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <filter>
    <filter-name>SpringCharacterEncodingFilter</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>SpringCharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring/springmvc-servlet.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.action</url-pattern>
  </servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>