Spring MVC HiddenHttpMethodFilter 实现 REST风格的URL

<?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"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>springmvc1</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<!-- 配置org.springframework.web.filter.HiddenHttpMethodFilter：可以把POST请求转为DELETE或POST请求 -->
<filter>
<filter-name>HiddenHttpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 配置  DispatcherServlet-->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置DispatcherServlet的一个初始化参数：配置SprngMVC配置文件的位置和名称 -->
<!--
实际上也可以不通过contextConfigLocation来配置SpringMVC的配置文件，而使用
默认的配置文件：/WEB-INF/<servlet-name>-servlet.xml
-->
<!--
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

<form action="springmvc/testRest/1" method="post">
<input type="hidden" name="_method" value="PUT">
<input type="submit" value="TestRest PUT">
</form>
<br />
<form action="springmvc/testRest/1" method="post">
<input type="hidden" name="_method" value="DELETE">
<input type="submit" value="TestRest DELETE">
</form>
<br />
<form action="springmvc/testRest/1" method="post">
<input type="submit" value="TestRest POST">
</form>
<br />
<a href="springmvc/testRest/1">Test Rest Get</a>
<br />

package com.hust.springmvc1;

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;
import org.springframework.web.bind.annotation.SessionAttributes;

@SessionAttributes(value={"user"}, types={String.class})
@Controller
@RequestMapping("/springmvc")
public class SpringMVCTest {

private static final String SUCCESS = "success";

/*
* Rest 风格的 URL
* 以 CRUD 为例：
* 新增： /order POST
* 修改： /order/1 PUT      update?id=1
* 获取： /order/1 GET      get?id=1
* 删除： /order/1 DELETE   delete?id=1
*
* 如何发送 PUT 请求和 DELETE 请求呢？
* 1. 需要配置 HiddenHttpMethodFilter
* 2. 需要发送POST请求
* 3. 需要在发送POST请求时携带一个 name="_method" 的隐藏域， 值为 DELETE 或 PUT
*
* 在SpringMVC 的目标方法中如何得到 id 呢？
* 使用 @PathVariable 注解
*/
@RequestMapping(value = "/testRest/{id}", method = RequestMethod.PUT)
public String testRestPut(@PathVariable Integer id) {
System.out.println("testRest Put: " + id);
return SUCCESS;
}

@RequestMapping(value = "/testRest/{id}", method = RequestMethod.DELETE)
public String testRestDelete(@PathVariable Integer id) {
System.out.println("testRest Delete: " + id);
return SUCCESS;
}

@RequestMapping(value = "/testRest/{id}", method = RequestMethod.POST)
public String testRest() {
System.out.println("testRest POST ");
return SUCCESS;
}

@RequestMapping(value = "/testRest/{id}", method = RequestMethod.GET)
public String testRest(@PathVariable Integer id) {
System.out.println("testRest GET: " + id);
return SUCCESS;
}
}