求解决！springMVC入门案例中出现的问题

Question

一、配置的jar包：

二、springMVC配置：

1.mvc.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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
	
	<!--1、开启注解管理对象IOC注解（重点掌握） :扫描包，扫描的是controller层-->
	<context:component-scan base-package="com.henu.controller" />
	<!--2、开启注解开发mvc(映射访问路径) MVC注解-->
	<!--配置注解驱动（重点掌握），会默认加载上边两个HandlerMapping,HandlerAdapter；使controller层注解生效-->
	<mvc:annotation-driven></mvc:annotation-driven>
</beans>

2.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>SpringMVC</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>
  <servlet>
		<servlet-name>mvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:mvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>  
    	<servlet-name>mvc</servlet-name>  
    	<!--所有控制器的访问路径都要以.do结尾  -->
    	<url-pattern>*.do</url-pattern>  
	</servlet-mapping>
</web-app>

三、FirstController.java

package com.henu.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class FirstController {
	@RequestMapping("/hello")
	public String hello() {
		System.out.println("控制器被访问了");
		return null;
	}
}

四、运行

URL  http://localhost:8080/SpringMVC/hello.do

运行结果

   控制台未出现“控制器被访问了”：

Answer 1

@RequestMapping("/hello.do")

要改成 .do 结尾的