Spring RESTful风格url示例

REST是设计风格而不是标准

• 资源是由URI来指定。

• 对资源的操作包括获取、创建、修改和删除资源

  这些操作正好对应HTTP协议提供的GET、POST、PUT和DELETE方法。

• 通过操作资源的表现形式来操作资源。

常用操作

GET	获取
POST	提交
PUT	更新
Delete	删除

REST确实不是标准，只是设计风格，目的只是让url看起来更简洁实用，是资源状态的一种表达。

实战篇

Demo下载地址http://pan.baidu.com/s/1o6sJLZs

项目结构

Maven依赖

< properties >
< springframework >4.0.2.RELEASE springframework >
< log4j >1.2.17 log4j >
< jstl >1.2 jstl >
properties >
< dependencies >

< dependency >
< groupId >org.springframework groupId >
< artifactId >spring-webmvc artifactId >
< version >${springframework} version >
dependency >

< dependency >
< groupId >jstl groupId >
< artifactId >jstl artifactId >
< version >${jstl} version >
dependency >

< dependency >
< groupId >log4j groupId >
< artifactId >log4j artifactId >
< version >${log4j} version >
dependency >

< dependency >
< groupId >junit groupId >
< artifactId >junit artifactId >
< version >3.8.1 version >
< scope >test scope >
dependency >
dependencies >

web.xml配置

需要注意，HiddenHttpMethodFilter是针对浏览器表单不支持put和delete方法而设计的，通过在表单中设置隐藏域，来分发到相应的处理器上，如

开发后记：最近把RESTful风格融入到了项目中去了，在开发过程中发现一个问题，就是aJax提交的PUT请求，无法通过HiddenHttpMethodFilter这个过滤器拿到值，后来搜索一番，改用HttpPutFormContentFilter即可

xml  version = "1.0"  encoding = "UTF-8" ?>

< web-app  xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns = "http://java.sun.com/xml/ns/javaee"  xmlns:web = "http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version = "3.0" >
< display-name >SpringActivemqServer display-name >

< context-param >
< param-name >webAppRootKey param-name >
< param-value >example.SpringActivemqServer param-value >
context-param >

< context-param >
< param-name >log4jConfigLocation param-name >
< param-value >classpath:log4j.properties param-value >
context-param >
< context-param >
< param-name >log4jRefreshInterval param-name >
< param-value >6000 param-value >
context-param >

< listener >
< listener-class >org.springframework.web.util.Log4jConfigListener listener-class >
listener >


< filter >
< filter-name >characterEncoding filter-name >
< filter-class >org.springframework.web.filter.CharacterEncodingFilter filter-class >
< init-param >
< param-name >encoding param-name >
< param-value >UTF-8 param-value >
init-param >
< init-param >
< param-name >forceEncoding param-name >
< param-value >true param-value >
init-param >
filter >
< filter-mapping >
< filter-name >characterEncoding filter-name >
< url-pattern >/* url-pattern >
filter-mapping >


< context-param >
< param-name >contextConfigLocation param-name >
< param-value >classpath*:applicationContext.xml param-value >
context-param >
< listener >
< listener-class >org.springframework.web.context.ContextLoaderListener listener-class >
listener >


< servlet >
< servlet-name >SpringMVC servlet-name >
< servlet-class >org.springframework.web.servlet.DispatcherServlet servlet-class >
< init-param >
< param-name >contextConfigLocation param-name >
< param-value >classpath:spring-mvc.xml param-value >
init-param >
< load-on-startup >1 load-on-startup >
servlet >
< servlet-mapping >
< servlet-name >SpringMVC servlet-name >

< url-pattern >/ url-pattern >
servlet-mapping >


< filter >
< filter-name >HiddenHttpMethodFilter filter-name >
< filter-class >org.springframework.web.filter.HiddenHttpMethodFilter filter-class >
filter >
< filter-mapping >
< filter-name >HiddenHttpMethodFilter filter-name >
< servlet-name >SpringMVC servlet-name >
filter-mapping >
< welcome-file-list >
< welcome-file >index.jsp welcome-file >
welcome-file-list >
web-app >

spring-mvc.xml配置

xml  version = "1.0"  encoding = "UTF-8" ?>

< beans  xmlns = "http://www.springframework.org/schema/beans"
       xmlns:context = "http://www.springframework.org/schema/context"
       xmlns:mvc = "http://www.springframework.org/schema/mvc"
       xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    < bean  class = "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
    < property  name = "messageConverters" >
        < list >
            < bean
                class = "org.springframework.http.converter.StringHttpMessageConverter" >
                < property  name = "supportedMediaTypes" >
                    < list >
                        < bean  class = "org.springframework.http.MediaType" >
                            < constructor-arg  index = "0"  value = "text"  />
                            < constructor-arg  index = "1"  value = "plain"  />
                            < constructor-arg  index = "2"  value = "UTF-8"  />
                        bean >
                    list >
                property >
            bean >
        list >
    property >
bean >

    < mvc:annotation-driven  />

    < mvc:resources  location = "/resources/"  mapping = "/resources/**" />


    < context:component-scan  base-package = "org.xdemo.example"  >

        < context:include-filter  type = "annotation"  expression = "org.springframework.stereotype.Controller" />
    context:component-scan >

    < bean  class = "org.springframework.web.servlet.view.InternalResourceViewResolver" >
        < property  name = "prefix"  value = "/WEB-INF/views/"  />
        < property  name = "suffix"  value = ".jsp"  />
        < property  name = "order"  value = "1"  />
    bean >
beans >

applicationContext.xml

"1.0"  encoding= "UTF-8" ?>

"http://www.springframework.org/schema/beans"
xmlns:context= "http://www.springframework.org/schema/context"
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http: //www.springframework.org/schema/beans
        http: //www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http: //www.springframework.org/schema/context
        http: //www.springframework.org/schema/context/spring-context-4.0.xsd">

     package = "org.xdemo.example" >




       "annotation"  expression= "org.springframework.stereotype.Controller" />

User实体类

package  org.xdemo.example.springrestful.entity;
/**
 * @作者 Goofy
 * @邮件 [email protected]
 * @日期 2014-4-2下午1:40:32
 * @描述 用户实体类
 */
public  class  User {
private  String userId;
private  String userName;
public  User(){}
public  User(String userId,String userName){
this .userId=userId;
this .userName=userName;
}
/**
 * @return the userId
 */
public  String getUserId() {
return  userId;
}
/**
 * @param userId the userId to set
 */
public  void  setUserId(String userId) {
this .userId = userId;
}
/**
 * @return the userName
 */
public  String getUserName() {
return  userName;
}
/**
 * @param userName the userName to set
 */
public  void  setUserName(String userName) {
this .userName = userName;
}
}

UserController

package  org.xdemo.example.springrestful.controller;
import  java.util.ArrayList;
import  java.util.List;
import  org.springframework.stereotype.Controller;
import  org.springframework.ui.ModelMap;
import  org.springframework.web.bind.annotation.PathVariable;
import  org.springframework.web.bind.annotation.RequestMapping;
import  org.springframework.web.bind.annotation.RequestMethod;
import  org.springframework.web.bind.annotation.ResponseBody;
import  org.springframework.web.servlet.ModelAndView;
import  org.xdemo.example.springrestful.entity.User;
/**
 * @作者 Goofy
 * @邮件 [email protected]
 * @日期 2014-4-2下午1:28:07
 */
@Controller
@RequestMapping ( "/user" )
public  class  UserController {
public  List list= null ;
/**
 * user路径下默认显示用户列表
 * @return
 */
@RequestMapping (method=RequestMethod.GET)
public  ModelAndView index(){
if (list== null ){
list=getUserList();
}
ModelMap model= new  ModelMap();
model.addAttribute( "list" ,list);
return  new  ModelAndView( "user/index" ,model);
}
/**
 * 跳转到添加用户页面，约定优于配置，默认匹配文件/WEB-INF/views/user/add.jsp
 */
@RequestMapping ( "add" )
public  void  add(){}
/**
 * 新增保存用户
 * @param user
 * @return ModelAndView
 */
@RequestMapping (method=RequestMethod.POST)
public  ModelAndView addUser(User user){
if (list== null ){
list=getUserList();
}
list.add(user);
ModelMap model= new  ModelMap();
model.addAttribute( "list" ,list);
return  new  ModelAndView( "user/index" ,model);
}
/**
 * 查看用户详细信息
 * @param id
 * @return ModelAndView
 */
@RequestMapping (method=RequestMethod.GET,value= "{id}" )
public  ModelAndView viewUser( @PathVariable ( "id" )String id){
User user=findUserById(id);
ModelMap model= new  ModelMap();
model.addAttribute( "user" ,user);
return  new  ModelAndView( "user/view" ,model);
}
/**
 * 删除用户
 * @param id
 */
@ResponseBody
@RequestMapping (method=RequestMethod.DELETE,value= "{id}" )
public  String deleteUser( @PathVariable ( "id" )String id){
if (list== null ){
list=getUserList();
}
removeUserByUserId(id);
return  "suc" ;
}
/**
 * 跳转到编辑页面
 * @param id
 * @return ModelAndView
 */
@RequestMapping ( "{id}/edit" )
public  ModelAndView toEdit( @PathVariable ( "id" )String id){
User user=findUserById(id);
ModelMap model= new  ModelMap();
model.addAttribute( "user" ,user);
return  new  ModelAndView( "user/edit" ,model);
}
/**
 * 更新用户并跳转到用户列表页面
 * @param user
 * @return ModelAndView
 */
@RequestMapping (method=RequestMethod.PUT)
public  ModelAndView edit(User user){
updateUser(user);
return  new  ModelAndView( "redirect:/user/" );
}
/********************下面方法是操作数据的*********************/
/**
 * 造10个用户
 * @return List
 */
private  List getUserList(){
List list= new  ArrayList();
for ( int  i= 0 ; i< 10 ;i++){
list.add( new  User((i+ 1 )+ "" , "李四" +(i+ 1 )));
}
return  list;
}
/**
 * 删除用户
 * @param id
 * @return List
 */
private  List removeUserByUserId(String id){
if (list== null ) return  null ;
for (User user:list){
if (user.getUserId().equals(id)){
list.remove(user); break ;
}
}
return  list;
}
/**
 * 查找用户
 * @param id
 * @return User
 */
private  User findUserById(String id){
User user= null ;
if (list== null ) return  null ;
for (User _user:list){
if (_user.getUserId().equals(id)){
user=_user; break ;
}
}
return  user;
}
/**
 * 更新用户
 * @param user
 */
private  void  updateUser(User user){
for (User _user:list){
if (_user.getUserId().equals(user.getUserId())){
_user.setUserName(user.getUserName()); break ;
}
}
}
}

用户列表页面index.jsp

<%@ page language= "java"  import = "java.util.*"  pageEncoding= "UTF-8" %>
<%@ taglib uri= "http://java.sun.com/jsp/jstl/core"  prefix=