毕业实习day4——SSM搭建的实操

以修改用户前的查询为例

编写Mapper.xml

   <!-- 修改前查询 -->
    <select id="findUserById" parameterType="java.lang.Integer" resultType="com.zhongruan.bean.user"> //parameterType：参数类型  resultType：返回值类型
        select * from  tb_user where id = #{id}
    </select>

编写 service （service+ impl）

  	//修改前查询
    user findUserById(int id);

@Override
    public user findUserById(int id) {
        return userDao.findUserById(id);
    }

配置 Spring - MVC.xml 和 web.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-4.3.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.3.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

    <!-- 1.注解扫描位置-->
    <context:component-scan base-package="com.zhongruan.controller" />

    <!-- 2.配置映射处理和适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

    <!-- 3.视图的解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>

<?xml version="1.0" encoding="UTF-8"?>
  <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns="http://xmlns.jcp.org/xml/ns/javaee"
           xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
           version="3.1">

    <!-- 配置加载类路径的配置文件 -->
    <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>

    <!-- 配置监听器 -->
    <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
      <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>

    <!-- 解决中文乱码过滤器 -->
    <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>/*
    

    
    
      dispatcherServlet
      org.springframework.web.servlet.DispatcherServlet
      
      
        contextConfigLocation
        classpath:spring-mvc.xml
      
      
      1
    
    
      dispatcherServlet
      *.do
    

  

写Controller

//修改前查询
    @RequestMapping("/findUserById.do")
    public ModelAndView findUserById(int id){
        //1.调用service  获取结果
        user user = userService.findUserById(id);

        //2.实例化一个ModelAndView
        ModelAndView mv = new ModelAndView();
        mv.addObject("user",user);
        mv.setViewName("user-update");

       return mv;
    }