1,处理器的第二种配置方式
<!--配置handler -->
<bean id="/FirstController" class="com.songyan.controller.FirstController"></bean>
<bean id="logoon" class="com.songyan.controller.LoginHandler"> </bean>
<!--映射器 -->
<bean
class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
<!--映射器2 -->
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="login1">logoon</prop>
</props>
</property>
</bean>
<!--适配器 -->
<bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
<!--适配器2 -->
<bean
class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" />
<!--解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView"></property>
<property name="prefix" value="WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
2,LoginHandler
package com.songyan.controller; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.springframework.web.HttpRequestHandler; public class LoginHandler implements HttpRequestHandler { public void handleRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
request.setAttribute("username", username);
request.setAttribute("password", password);
request.getRequestDispatcher("login.jsp").forward(request, response);
} }
3,login.jsp
<%@ 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 'login.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="login1" method="post">
用户名:<input type="text" name="username" >${username }<br><br>
密码:<input type="text" name="password">${password}<br><br>
<input type="submit" value="login">
</form>
</body>
</html>
4,流程
(1)在浏览器输入要访问的URL(login.jsp)--->页面跳转到login.jsp页面
(2)在login.jsp 页面填充数据后,提交-->通过Action的参数设置(login1)
(3)提交的请求被前端控制器拦截,通过设置的配置文件的位置找到springmvc-servlet.xml文件
(4)前端控制器会调用处理器映射器,根据action中的参数找到login1(与prop 中的key对应)
(5)根据匹配的key值对应value(这里就是指的logoon)
(6)再根据value值找到对应的Handler
(7)调用handler,由于handler中的跳转语句,跳转到login.jsp页面