SpringMVC中HandlerAdapt的作用

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1.在spring 配置文件中配置HanlerAdapt

SimpleControllerHandlerAdapter：表示所有实现了org.springframework.web.servlet.mvc.Controller接口的Bean可以作为

Spring Web MVC中的处理器，基于这种特性，我们来实现基于xml的SpringMVC的配置。

2.在web.xml中配置DispatchServlet总控制器，并且配置初始化参数。

配置详情如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:config/spring.xml</param-value>
    </init-param>
</servlet>
<servlet-mapping>
     <servlet-name>spring</servlet-name>
     <url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

3.在spring.xml中配置如下：

<?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: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-3.0.xsd
  http://www.springframework.org/schema/mvc
  http://www.springframework.org/schema/mvc/spring-mvc-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 ">

<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>


<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

4.HelloAction中的代码如下所示：

package chang.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
public class HelloAction implements Controller {
public ModelAndView handleRequest(HttpServletRequest arg0,
   HttpServletResponse arg1) throws Exception {
  ModelAndView a=new ModelAndView();
  a.setViewName("hello");
  return a;
}
}

5.hello.jsp页面如下：

<%@ 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 'hello.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">

</head>

<body>
    Welcome SpringMVC ! <br>
</body>
</html>

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