06SpringMvc_适配器

适配器的主要功能是去找控制器。Action实现了什么接口

本文案例实现的功能是：在页面上输入中文名字，然后在另外一个网页上显示出来。

案例结构：

1.EmpAction代码如下，这个是控制器：

package com.guigu.shen.Action3;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

/*

 *
 * 控制器是实现Controller接口的类
 *
 *
 */
public class EmpAction implements Controller{

    @Override
    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        ModelAndView modelAndView=new ModelAndView();
        //设置编码方式：
        request.setCharacterEncoding("utf-8");

        //获取员工的姓名
        String username=request.getParameter("username");
        System.out.println("员工的姓名"+username);
        //将员工的姓名封装到ModelAndView中去。
        modelAndView.addObject("message", username);
        //将正式路径名封装到ModelAndView中。
          modelAndView.setViewName("/jsp/success.jsp");

        return modelAndView;
    }

}

2.SpirngMvc_003.xml文件代码如下：

<?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"
      xmlns:mvc="http://www.springframework.org/schema/mvc"
      xsi:schemaLocation="

      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd

      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
>
     <!-- 控制器(程序员)（必须配置） -->

<bean id="userActionID" class="com.guigu.shen.Action3.EmpAction"></bean>

 <!-- 映射器 

 与之前的BeanNameUrlHanderMapping不同这次采用的是SimpleUrlHandlerMapping映射器。

 -->
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

  <property name="mappings">

    <props>
    <!--
             依次写四个请求。并把之前的   <bean id="userActionID" class="com.guigu.shen.Action2.UserAction"></bean> 的id写入
     -->
      <prop key="/showuser.action">userActionID</prop>

    </props>
 </property>

</bean>  

 <!-- 如果Action汇总书写的是视图逻辑名称，那么视图解析器就必须配置（解释一下什么是视图逻辑名称：就是类似Struts2中的，"success"）
               如果Action中配置的是视图真实名称，那么视图解析器就可选配置(解释一下什么是视图真实名称，就是"/jsp/success.jsp")
 -->

 <bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver">

 </bean>
</beans>

3.springmvc.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:context="http://www.springframework.org/schema/context"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xmlns:tx="http://www.springframework.org/schema/tx"
      xmlns:mvc="http://www.springframework.org/schema/mvc"
      xsi:schemaLocation="

      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd

      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd

      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
>
<import resource="com/guigu/shen/Action3/springmvc_003.xml"/>
</beans>

4.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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>SpringMvc_10day_self</display-name>
  <servlet>
  <!--这个名字可以随便取得，但是这个名字取了之后，以后在 WEB-INF下面创建SpirngMVC的配置文件是，命名必须以这个开头，

  所以这里取名叫做DispatcherServlet，那么之后的xml文件取名必须为DispatcherServlet-servlet.xml（一个字都不能差）

  -->
  <servlet-name>DispatcherServlet</servlet-name>
  <servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <!-- 通知DispatcherServlet去指定目录下找到springmvc.xml配置文件 -->
 <!--
 注意这里的  <param-name>contextConfigLocation</param-name>一个字母都不能有错
 一旦有错就会去WEB-INF下面去找
  -->
          <init-param>
               <param-name>contextConfigLocation</param-name>
              <param-value>classpath:springmvc.xml</param-value>
          </init-param>
 </servlet>
 <servlet-mapping>
   <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>*.action</url-pattern>

 </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>
</web-app>

6.index.xml

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP ‘index.jsp‘ starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  <body>
  <form action="${pageContext.request.contextPath}/showuser.action" method="post">
  用户的姓名：<input type="text" name="username" >
          <input type="submit" value="提交">

  </form>
  </body>
</html>

运行结果：正确