springMVC注解的入门案例

1、web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <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">
 3   <display-name>springmvc1</display-name>
 4   
 5   <filter>
 6     <filter-name>characterEncoding</filter-name>
 7     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
 8     <init-param>
 9       <param-name>encoding</param-name>
10       <param-value>UTF-8</param-value>
11     </init-param>
12   </filter>
13   <filter-mapping>
14     <filter-name>characterEncoding</filter-name>
15     <url-pattern>/*</url-pattern>
16   </filter-mapping>
17   
18   <servlet>
19     <servlet-name>springmvc</servlet-name>
20     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
21     <init-param>
22       <param-name>contextConfigLocation</param-name>
23       <param-value>classpath:springmvc.xml</param-value>
24     </init-param>
25   </servlet>
26   <servlet-mapping>
27     <servlet-name>springmvc</servlet-name>
28     <url-pattern>*.do</url-pattern>
29   </servlet-mapping>
30   
31   <welcome-file-list>
32     <welcome-file>index.html</welcome-file>
33     <welcome-file>index.htm</welcome-file>
34     <welcome-file>index.jsp</welcome-file>
35     <welcome-file>default.html</welcome-file>
36     <welcome-file>default.htm</welcome-file>
37     <welcome-file>default.jsp</welcome-file>
38   </welcome-file-list>
39   
40 </web-app>

2、springmvc.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:mvc="http://www.springframework.org/schema/mvc"
 4     xmlns:aop="http://www.springframework.org/schema/aop" 
 5     xmlns:tx="http://www.springframework.org/schema/tx"
 6     xmlns:context="http://www.springframework.org/schema/context"
 7     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 8     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 9                         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
10                         http://www.springframework.org/schema/mvc 
11                         http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
12                         http://www.springframework.org/schema/context 
13                         http://www.springframework.org/schema/context/spring-context-3.2.xsd 
14                         http://www.springframework.org/schema/aop 
15                         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
16                         http://www.springframework.org/schema/tx 
17                         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
18                         
19         <!-- 把Controller交给spring管理 -->
20         <context:component-scan base-package="com.xiaostudy"/>
21         
22         <!-- 配置注解处理器映射器 功能：寻找执行类Controller -->
23         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
24         
25         <!-- 配置注解处理器适配器 功能：调用controller方法，执行controller -->
26         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
27         
28         <!-- 配置sprigmvc视图解析器：解析逻辑试图 
29              后台返回逻辑试图：index
30             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 -->
31         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
32             <property name="prefix" value="/WEB-INF/"/>
33             <property name="suffix" value=".jsp"/>        
34         </bean>
35 </beans>

3、用注解@Controller类

 1 package com.xiaostudy.controller;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.RequestMethod;
 6 
 7 @Controller//<bean class="com.xiaostudy.controller.MyController"/>
 8 @RequestMapping(value="/myController")//访问该类的方法时，前面多这样一个路径
 9 public class MyController {
10     
11 //    @RequestMapping("hello")//http://localhost:8080/demo2/hello.do
12 //    @RequestMapping("/hello")//http://localhost:8080/demo2/hello.do
13 //    @RequestMapping(value="/hello.do")//http://localhost:8080/demo2/hello.do
14 //    @RequestMapping(value="/hello.do",method=RequestMethod.GET)//http://localhost:8080/demo2/hello.do
15 //    @RequestMapping(value="/hello.do",method= {RequestMethod.GET,RequestMethod.POST})//http://localhost:8080/demo2/hello.do
16     public String print() {
17         return "index";
18     }
19     
20     @RequestMapping("hi")//http://localhost:8080/demo2/myController/hi.do
21     public String hello() {
22         return "index";
23     }
24 
25 }

4、index.jsp

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

项目文件结构

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