SpringMVC 注解式开发

SpringMVC的注解式开发是指，处理器是基于注解的类的开发。对于每一个定义的处理器，无需再配置文件中逐个注册，只需在代码中通过对类与方法的注解，便可完成注册。即注解替换是配置文件中对于处理器的注册部分。

一、第一个注解式开发程序

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <%@page isELIgnored="false" %>
 4 <html>
 5   <head> 
 6     <title>welcome page</title>
 7   </head>
 8   
 9   <body>
10     ${message}
11   </body>
12 </html>

welcome.xml

 1 import javax.servlet.http.HttpServletRequest;
 2 import javax.servlet.http.HttpServletResponse;
 3 
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.servlet.ModelAndView;
 7 
 8 @Controller //表示当前类是一个处理器
 9 public class MyController  {
10 
11      @RequestMapping("/my.do")
12     public ModelAndView handleRequest(HttpServletRequest request, 
13             HttpServletResponse response) throws Exception {
14         // TODO Auto-generated method stub
15         ModelAndView mv= new ModelAndView();
16         mv.addObject("message","hello SpringMVC World!");
17         mv.setViewName("/WEB-INF/jsp/welcome.jsp");
18         return mv;
19     }
20 
21 }

MyController

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4         xmlns:context="http://www.springframework.org/schema/context"
 5         xmlns:aop="http://www.springframework.org/schema/aop"
 6         xmlns:tx="http://www.springframework.org/schema/tx"
 7         xmlns:mvc="http://www.springframework.org/schema/mvc"
 8         xsi:schemaLocation="http://www.springframework.org/schema/beans
 9         http://www.springframework.org/schema/beans/spring-beans.xsd
10         http://www.springframework.org/schema/context
11         http://www.springframework.org/schema/context/spring-context.xsd
12         http://www.springframework.org/schema/aop
13         http://www.springframework.org/schema/aop/spring-aop.xsd
14         http://www.springframework.org/schema/tx
15         http://www.springframework.org/schema/tx/spring-tx.xsd
16         http://www.springframework.org/schema/mvc
17         http://www.springframework.org/schema/mvc/spring-mvc.xsd">
18  <!--   注册组件扫描器 -->
19    <context:component-scan base-package="com.jmu.handlers"></context:component-scan>
20 </beans>

springmvc.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>01-springmvc-primary</display-name>
 4   <servlet>
 5     <servlet-name>springMVC</servlet-name>
 6     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 7     <init-param>
 8       <param-name>contextConfigLocation</param-name>
 9       <param-value>classpath:springMVC.xml</param-value>
10     </init-param>
11     <load-on-startup>1</load-on-startup>
12   </servlet>
13   <servlet-mapping>
14     <servlet-name>springMVC</servlet-name>
15     <url-pattern>*.do</url-pattern>
16   </servlet-mapping>
17   <welcome-file-list>
18     <welcome-file>index.jsp</welcome-file>
19   </welcome-file-list>
20 </web-app>

web.xml

二、处理器的请求映射规则的定义

（1）对请求URI的命名空间的定义

A、一个处理器定义多个处理方法

 1 @Controller //表示当前类是一个处理器
 2 public class MyController{
 3 
 4      @RequestMapping({"/my.do","hello.do"})
 5     public ModelAndView doFirst(HttpServletRequest request, 
 6             HttpServletResponse response) throws Exception {
 7         // TODO Auto-generated method stub
 8         ModelAndView mv= new ModelAndView();
 9         mv.addObject("message","执行doFirst()方法");
10         mv.setViewName("/WEB-INF/jsp/welcome.jsp");
11         return mv;
12     }
13      @RequestMapping("/second.do")
14      public ModelAndView Second(HttpServletRequest request, 
15              HttpServletResponse response) throws Exception {
16          // TODO Auto-generated method stub
17          ModelAndView mv= new ModelAndView();
18          mv.addObject("message","执行doSecond()方法");
19          mv.setViewName("/WEB-INF/jsp/welcome.jsp");
20          return mv;
21      }
22 
23 }

MyController

B、命名空间

(2)请求URI中通配符的应用

（3）对请求提交方式的定义

     @RequestMapping(value={"/my.do","hello.do"},method=RequestMethod.POST)

(4)对于请求中携带参数的定义