第二篇 SSM运行Demo

tanoak

发布于 2018-06-06 11:51:35

3590

发布于 2018-06-06 11:51:35

文章被收录于专栏：java闲聊java闲聊

首先我们了解一下项目结构

Snipaste_2018-01-14_16-33-12.png

本次我们返回到浏览器的为Json数据，所以要增加3个jar包

<dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.8.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.8.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.8.0</version>
    </dependency>

编写Dao层 Mapper接口

@Repository
public interface HelloMapper extends BaseMapper<Hello>{

   Hello findById(@Param("id") int id);  
}

Mapper.xml文件

<mapper namespace="com.tanoak.dao.HelloMapper">
  <!--查看所有用户-->
  <select id="findById" resultType="com.tanoak.entity.Hello">
  SELECT * FROM hello WHERE id=#{id}
   </select> </mapper>

Snipaste_2018-01-14_16-40-30.png

接下来就是写上Server层，这个就不多解释了，直接上代码

public interface ITestService {

   /**
 * Result 仅供测试用的方法 */  Hello test();   
}

实现层

@Service public class TestServiceImpl implements ITestService{

  @Resource
  private HelloMapper helloMapper ;
  @Override
  public Hello test() {
      return helloMapper.findById(1);
  }

Controller层

@Controller @RequestMapping("/test")
public class TestController {

    @Resource
  private ITestService testService ;
  @RequestMapping("/json")
    @ResponseBody
  public Hello testHello(){
        return testService.test() ;
  }
}

最后，然后配置web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>   <web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"  version="3.0"
  metadata-complete="true">
 <!--Spring监听-->
 <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener> 
<context-param> 
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-config.xml</param-value>
 </context-param>
 <!--日志文件-->
 <context-param>
 <param-name>log4jConfigLocation</param-name>
 <param-value>classpath:log4j.properties</param-value>
 </context-param> 
 <!-- 编码过滤器 --> 
<filter>
 <filter-name>encodingFilter</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>encodingFilter</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping>
<!--SpringMVC-->
<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-mvc.xml</param-value>
  </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
 </servlet>
<servlet-mapping> <servlet-name>SpringMVC</servlet-name>
  <!-- 此处也可以配置成 *.do 形式 -->
  <url-pattern>/</url-pattern>
 </servlet-mapping>
</web-app>

完成访问