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

来源：互联网发布：saber软件百度云编辑：程序博客网时间：2024/05/19 17:51

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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