springMVC注解的入门案例

1、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_2_5.xsd" id="WebApp_ID" version="2.5">
   <display-name>springmvc1</display-name>

   <filter>
     <filter-name>characterEncoding</filter-name>
     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
     <init-param>
       <param-name>encoding</param-name>
       <param-value>UTF-8</param-value>
     </init-param>
   </filter>
   <filter-mapping>
     <filter-name>characterEncoding</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>

   <servlet>
     <servlet-name>springmvc</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:springmvc.xml</param-value>
     </init-param>
   </servlet>
   <servlet-mapping>
     <servlet-name>springmvc</servlet-name>
     <url-pattern>*.do</url-pattern>
   </servlet-mapping>

   <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>

 </web-app>

2、springmvc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
                         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
                         http://www.springframework.org/schema/mvc
                         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
                         http://www.springframework.org/schema/context
                         http://www.springframework.org/schema/context/spring-context-3.2.xsd
                         http://www.springframework.org/schema/aop
                         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
                         http://www.springframework.org/schema/tx
                         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

         <!-- 把Controller交给spring管理 -->
         <context:component-scan base-package="com.xiaostudy"/>

         <!-- 配置注解处理器映射器 功能：寻找执行类Controller -->
         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

         <!-- 配置注解处理器适配器 功能：调用controller方法，执行controller -->
         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

         <!-- 配置sprigmvc视图解析器：解析逻辑试图
              后台返回逻辑试图：index
             视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/index.jsp -->
         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
             <property name="prefix" value="/WEB-INF/"/>
             <property name="suffix" value=".jsp"/>
         </bean>
 </beans>

3、用注解@Controller类

 package com.xiaostudy.controller;

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

 @Controller//<bean class="com.xiaostudy.controller.MyController"/>
 @RequestMapping(value="/myController")//访问该类的方法时，前面多这样一个路径
 public class MyController {

 //    @RequestMapping("hello")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping("/hello")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do")//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do",method=RequestMethod.GET)//http://localhost:8080/demo2/hello.do
 //    @RequestMapping(value="/hello.do",method= {RequestMethod.GET,RequestMethod.POST})//http://localhost:8080/demo2/hello.do
     public String print() {
         return "index";
     }

     @RequestMapping("hi")//http://localhost:8080/demo2/myController/hi.do
     public String hello() {
         return "index";
     }

 }

4、index.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
             "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <title>springMVC_demo</title>
 </head>
 <body>
     xiaostudy
 </body>
 </html>

项目文件结构

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