springMVC中的控制器映射器handlerMapping

注:有几种不同的控制器映射器实现类，分别为BeanNameUrlHandlerMapping、SimpleUrlHandlerMapping、和RequestMappingHandlerMapping等等。

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>01-springMVCPrimary</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 注册中央调度器 -->
  <servlet>
  	<servlet-name>springMVC</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<!-- 指定springMVC的配置文件的位置和路径 -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springMVC.xml</param-value>
  	</init-param>
  	<!-- 表示启动服务器就创建该对象，不设置的话，那么就在请求到达时，创建该对象 -->
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springMVC</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  
</web-app>

2、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.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
        
        <!-- 注册处理器映射器 -->
		<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
			<!-- 方式1
			<property name="mappings">
				<props>
					<prop key="/my.do">myController</prop>
					<prop key="/hello.do">myController</prop>
					<prop key="/world.do">myController</prop>
				</props>
			</property>
			 -->
			 <!--方式2  -->
			 <property name="urlMap">
			 	<map>
			 		<entry key="/my.do" value="myController"/>
			 		<entry key="/hello.do" value="myController"/>
			 		<entry key="/world.do" value="myController"/>
			 	</map>
			 </property>
		</bean>        
        
        <!--注册处理器  -->
		<bean id="myController" class="com.handlers.MyController"/>		 
		 
</beans>

3、MyController

package com.handlers;

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 MyController implements Controller {

	@Override
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		
		ModelAndView mv = new ModelAndView();
		mv.addObject("message", "Hello SpringMVC World!");
		mv.setViewName("/WEB-INF/jsp/welcome.jsp");
		return mv;
	}

}