spring rest初体验

之前项目一直使用spring+struts2的方式 ，看了下spring3的新特性（out了，4都出来了）--支持rest，于是试试，参考了Lee_cho举的例子，自己亲自测试了下，所需jar如下（这里全部下载的最新版本），目前spring官网改版了，下载jar包需要用mvn，找了半天都没找到入口

-----------------------------web.xml------------------------------

<?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>            <!--rest配置文件的路径，貌似不配置也是加载这个地址，这个地方有点疑问，大家指点指点-->        <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>            <!-- 配置一个Servlet，有这个Servlet统一调度页面的请求 -->        <servlet-name>rest</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>      </servlet>      <servlet-mapping>            <!-- 映射路径，不要写成了/*那样会拦截所有的访问，连JSP页面都访问不了 -->        <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>  

--------------------------rest-servlet.xml-----------------------------------------------------

<?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>    <!--检测注解 -->    <context:component-scan base-package="com.zhuzi.controller" />    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />    <!-- 注册视图解析器，说白了就是根据返回值指定到某个页面 -->    <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> <!--页面文件的路径，在根目录下 -->        <property name="suffix"><value>.jsp</value></property>     </bean></beans>  

--------------具体实现类--------SimpleController.java-----------------------

package com.zhuzi.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 {    // 映射路径/simple/index当访问这个路径时，执行这个方法    @RequestMapping("/index")    public String index(HttpServletRequest request, HttpServletResponse response) {        // response,request会自动传进来        request.setAttribute("message", "Hello,This is a example of Spring3 RESTful!");        // 用来在同一个request周期中保存变量使用。比如servlet调用后，推出JSP页面，这是一个request周期，如果在Jsp页面需要servlet中的一些 处理结构，就从request.getAttribute中获取。        return "index";    }    // 根据ID获取不同的内容，通过@PathVariable 获得属性    @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";    }}

---------------------index.jsp页面： ---------------------------

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

运行结果：

http://localhost:8080/springRest/simple/index  

Hello,This is a example of Spring3 RESTful!    

  

 http://localhost:8080/springRest/simple/2

Hello,This is a example of Spring3 RESTful!
ID:2  

比较容易出问题的就是下面的位置

  <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />

        <property name="prefix" value="/"></property> <!--页面文件的路径，在根目录下 -->

        <property name="suffix"><value>.jsp</value></property> <!--后缀 -->

注意一定要能够找到你的jsp，否则就会出现下面的问题： 

警告: No mapping found for HTTP request with URI [/springRest/simple/index/] in DispatcherServlet with name 'rest'