REST风格
/user/1 get请求 获取用户
/user/1 post请求 新增用户
/user/1 put请求 更新用户
/user/1 delete请求 删除用户
在Spring MVC中如何提交put和delete请求呢？
需要在web.xml文件中配置一个HiddenHttpMethodFilter过滤器。该过滤过滤post请求，如果在post请求中有个一个_method参数，那么_method参数值就是请求方式。所以在jsp页面可以这样写
1 <a href="user/1">GET请求</a>
2
3 <form action="user/1" method="post">
4 <input type="submit" value="POST请求"/>
5 </form>
6
7 <form action="user/1" method="post">
8 <input type="hidden" name="_method" value="PUT">
9 <input type="submit" value="PUT请求"/>
10 </form>
11
12 <form action="user/1" method="post">
13 <input type="hidden" name="_method" value="DELETE">
14 <input type="submit" value="DELET请求"/>
15 </form>
web.xml配置过滤器
1 <filter>
2 <filter-name>methodFilter</filter-name>
3 <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
4 </filter>
5
6 <filter-mapping>
7 <filter-name>methodFilter</filter-name>
8 <url-pattern>/*</url-pattern>
9 </filter-mapping>
控制器
1 package com.proc;
2
3 import org.springframework.stereotype.Controller;
4 import org.springframework.web.bind.annotation.PathVariable;
5 import org.springframework.web.bind.annotation.RequestMapping;
6 import org.springframework.web.bind.annotation.RequestMethod;
7
8 @Controller
9 public class User {
10
11 @RequestMapping(value="user/{id}",method=RequestMethod.GET)
12 public String get(@PathVariable("id") Integer id){
13 System.out.println("获取用户:"+id);
14 return "hello";
15 }
16
17 @RequestMapping(value="user/{id}",method=RequestMethod.POST)
18 public String post(@PathVariable("id") Integer id){
19 System.out.println("添加用户:"+id);
20 return "hello";
21 }
22
23 @RequestMapping(value="user/{id}",method=RequestMethod.PUT)
24 public String put(@PathVariable("id") Integer id){
25 System.out.println("更新用户:"+id);
26 return "hello";
27 }
28
29 @RequestMapping(value="user/{id}",method=RequestMethod.DELETE)
30 public String delete(@PathVariable("id") Integer id){
31 System.out.println("删除用户:"+id);
32 return "hello";
33 }
34 }
我们一次点击GET请求、POST请求、PUT请求和DELETE请求
获取用户:1
添加用户:1
更新用户:1
删除用户:1
【总结】：发出PUT请求和DELET请求的步骤
1、在发出请求时必须是POST请求
2、在POST请求中添加一个名为_method的参数，其值用来指定是PUT请求还是DELETE请求
3、配置HiddenHttpMethodFilter过滤器。该过滤器的作用是POST请求可以转换成PUT或DELET请求