Spring3.0實現REST實例

關於REST是什麼東西，在這裏我就不再多說，大家可以去http://blog.csdn.net/pilou5400/archive/2010/12/24/6096861.aspx看看介紹，直接切入主題：

這是一個rest風格的訪問，Spring從3.0開始將全面支持rest。不得不感嘆Spring的強悍。

項目結構：

第一步永遠是配置，使用框架永遠都是先有配置，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這個文件

<?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：具體實現類

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 { //映射路徑/simple/index當訪問這個路徑時，執行這個方法 @RequestMapping("/index") public String index(HttpServletRequest request ,HttpServletResponse response){ //response,request會自動傳進來 request.setAttribute("message", "Hello,This is a example of Spring3 RESTful!"); return "index.jsp"; } //根據ID獲取不同的內容，通過@PathVariable 獲得屬性 @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+""); //response.getWriter().write("You put id is : "+id); return "index.jsp"; //return null; } }

index.jsp頁面：

<%@ page language="java" pageEncoding="UTF-8"%> <html> <head> <title>Spring3 RESTful</title> </head> <body> ${message} </body> </html>

在瀏覽器中輸入：http://localhost:8080/SpringREST/simple/index/，就可以看到效果。

也可以在頁面輸入不同的參數，獲得不同的內容，輸入地址：http://localhost:8080/SpringREST/simple/88888，這次執行的就是get方法，通過註解獲取ID值，效果：

關於Spring rest 對於Ajax的支持，其實響應Ajax就是通過response返回一個字符串到頁面，既然能獲得response對象，那問題就迎刃而解了，我們改造下get方法：

@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+""); response.getWriter().write("You put id is : "+id); //return "index.jsp"; return null; }

改造index.jsp頁面：

<%@ 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" οnclick="go(document.getElementById('id').value)"> <div id="text"></div> </body> </html>

訪問http://localhost:8080/SpringREST/simple/index/，在頁面裏的輸入框中輸入值，可以看到返回的數據：

DEMO下載：http://download.csdn.net/source/3383568

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