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SpringMVC学习笔记（三）：handlerMapping的三种方式及Controller三种配置

2017-05-27 01:03 417 查看

方式一：根据beanName找到对应的Controller

前端jsp中代码

<a href="user.do?mapType=1">根据beanName找到对应的Controller</a><br/>

springmvc-servlet.xml配置：

<!-- 根据beanName找到对应的Controller -->
<bean name="/user.do" class="com.lin.controller.UserController"></bean>

方式二：根据URL找到对应的Controller

前端jsp中代码

<a href="userInfo.do?mapType=2">根据URL找到对应的Controller</a><br/>

springmvc-servlet.xml配置：

<!-- 根据URL找到对应的Controller -->
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/userInfo.do">userController</prop>
</props>
</property>
</bean>
<bean id="userController"  class="com.lin.controller.UserController"></bean>

方式三：根据Controller类名找到对应的Controller

前端jsp中代码

<a href="userController.do?mapType=3">根据Controller类名找到对应的Controller</a><br/>

springmvc-servlet.xml配置：

<!-- 根据控制类的类名找到对应的Controller，访问时类名首字母小写 -->
<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean>
<bean class="com.lin.controller.UserController"></bean>

疑问：

不知道为什么我将其他两种的配合注释掉了，重启servers,另外两种方式还是有效的。

实例：

request.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 'request.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>

<a href="user.do?mapType=1">根据beanName找到对应的Controller</a><br/>
<a href="userInfo.do?mapType=2">根据URL找到对应的Controller</a><br/>
<a href="userController.do?mapType=3">根据Controller类名找到对应的Controller</a><br/>
<p>${resp}</p>
</body>
</html>

UserController.java

package com.lin.controller;

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

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

public class UserController extends AbstractController {

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest arg0,
HttpServletResponse arg1) throws Exception {
// 后台输出
System.out.println("接收到request:" + arg0.getParameter("mapType"));
//将前端传过来的类型又传回去显示
ModelAndView mav = new ModelAndView("request");
mav.addObject("resp","ok response type :" + arg0.getParameter("mapType"));
return mav;
}

}

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_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>SpringMVC03</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

springmvc-servlet.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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> 
<!-- 配置Controller -->

<!-- 根据beanName找到对应的Controller -->
<!-- <bean name="/user.do" class="com.lin.controller.UserController"></bean>
-->

<!-- 根据URL找到对应的Controller -->
<!-- <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/userInfo.do">userController</prop>
</props>
</property>
</bean>
<bean id="userController"  class="com.lin.controller.UserController"></bean>
-->

<!-- 根据控制类的类名找到对应的Controller，访问时类名首字母小写 -->
<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean>
<bean class="com.lin.controller.UserController"></bean>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 配置前缀 -->
<property name="prefix" value="/"></property>
<!-- 配置后缀 -->
<property name="suffix" value=".jsp"></property>
</bean>

</beans>

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