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 关于REST是什么东西,在这里我就不再多说,大家可以去http://blog.csdn.net/pilou5400/archive/2010/12/24/6096861.aspx看看介绍,直接切入主题:

      这是一个rest风格的访问,Spring从3.0开始将全面支持rest。不得不感叹Spring的强悍。
      项目结构:
 

      第一步永远是配置,使用框架永远都是先有配置,在web.xml中的配置:
- <?xml version="1.0" encoding="UTF-8"?>  
- <web-app version="3.0"   
-     xmlns="http://java.sun.com/xml/ns/javaee"   
-     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
-     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   
-     http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">  
-   <display-name></display-name>   
-   <context-param>  
-         
-     <param-name>contextConfigLocation</param-name>  
-     <param-value>/WEB-INF/rest-servlet.xml</param-value>  
-   </context-param>  
-   <listener>  
-     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
-   </listener>  
-   <servlet>  
-         
-     <servlet-name>rest</servlet-name>  
-     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
-     <load-on-startup>2</load-on-startup>  
-   </servlet>  
-   <servlet-mapping>  
-         
-     <servlet-name>rest</servlet-name>  
-     <url-pattern>/</url-pattern>  
-   </servlet-mapping>  
-   <welcome-file-list>  
-     <welcome-file>/index.jsp</welcome-file>  
-   </welcome-file-list>  
- </web-app>  
 
 
   第二步:配置rest-servlet.xml这个文件
- <?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:jee="http://www.springframework.org/schema/jee"  
-     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"  
-     xmlns:aop="http://www.springframework.org/schema/aop"  
-     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"  
-     default-lazy-init="true">  
-   
-   <description>Spring公共配置</description>  
-   
-   
-   <context:component-scan base-package="com.liqiu" />  
-   <bean   class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />  
-   <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />  
-   <bean id="viewResolver"   class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
-     <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />  
-     <property name="prefix" value="/"></property> 
-    </bean>  
- </beans>  
 
 
 第三步:具体实现类
- package com.liqiu.controller;  
-   
- import java.io.IOException;  
-   
- import javax.servlet.http.HttpServletRequest;  
- import javax.servlet.http.HttpServletResponse;  
-   
- import org.springframework.stereotype.Controller;  
- import org.springframework.web.bind.annotation.PathVariable;  
- import org.springframework.web.bind.annotation.RequestMapping;  
- import org.springframework.web.bind.annotation.RequestMethod;  
-   
- @Controller  
- @RequestMapping("/simple")  
- public class SimpleController {  
-     
-     @RequestMapping("/index")  
-     public String index(HttpServletRequest request ,HttpServletResponse response){  
-                
-         request.setAttribute("message", "Hello,This is a example of Spring3 RESTful!");  
-         return "index.jsp";  
-     }  
-     
-     @RequestMapping(value="/{id}",method=RequestMethod.GET)  
-     public String get(@PathVariable String id,HttpServletRequest request ,HttpServletResponse response) throws IOException{  
-         request.setAttribute("message", "Hello,This is a example of Spring3 RESTful!<br/>ID:"+id+"");  
-         
-         return "index.jsp";  
-         
-     }  
- }  
 
 
   index.jsp页面:
 
- <%@ page language="java" pageEncoding="UTF-8"%>  
- <html>  
-   <head>  
-     <title>Spring3 RESTful</title>  
-    </head>  
-     
-   <body>  
-     ${message}  
-    </body>  
- </html>  
 
 
    在浏览器中输入:http://localhost:8080/SpringREST/simple/index/,就可以看到效果。
    也可以在页面输入不同的参数,获得不同的内容,输入地址:http://localhost:8080/SpringREST/simple/88888,这次执行的就是get方法,通过注解获取ID值,效果:

    关于Spring rest 对于Ajax的支持,其实响应Ajax就是通过response返回一个字符串到页面,既然能获得response对象,那问题就迎刃而解了,我们改造下get方法:
 
- @RequestMapping(value="/{id}",method=RequestMethod.GET)  
-     public String get(@PathVariable String id,HttpServletRequest request ,HttpServletResponse response) throws IOException{  
-         
-         response.getWriter().write("You put id is : "+id);  
-         
-         return null;  
-     }  
 
    改造index.jsp页面:
- <%@ page language="java" pageEncoding="UTF-8"%>  
- <html>  
-   <head>  
-     <title>Spring3 RESTful</title>  
-     <SCRIPT TYPE="text/javascript">  
-             function go(value){  
-                 var url = "/SpringREST/simple/"+value+"/";  
-                 var request =  new XMLHttpRequest();  
-                 request.open("GET", url, true);  
-                 request.setRequestHeader("Content-Type","application/x-javascript;");  
-                 request.onreadystatechange = function() {  
-                     if (request.readyState == 4) {  
-                         if (request.status == 200){  
-                             if (request.responseText) {  
-                                 document.getElementById("text").innerHTML = request.responseText;  
-                             }  
-                         }  
-                     }  
-                 };  
-                 request.send(null);  
-             }  
-         </SCRIPT>  
-   </head>  
-     
-   <body>  
-     ${message}  
-     <br>  
-     Input the id of you will access object:<input id="id" type="text" size="7"><input type="button" value="Go" onclick="go(document.getElementById(‘id‘).value)">  
-     <div id="text"></div>  
-   </body>  
- </html>  
 
    访问http://localhost:8080/SpringREST/simple/index/,在页面里的输入框中输入值,可以看到返回的数据:
 

Spring3.0实现REST实例
标签:des   style   blog   http   os   io   使用   java   ar   
原文地址:http://www.cnblogs.com/atomgame/p/3959239.html