HiddenHttpMethodFilter过滤器—SpringMVC

浏览器form只支持GET和POST请求，尔DELETE和PUT请求并不支持，Spring3.0开始添加了HiddenHttpMethodFilter过滤器，可以将这些请求转换为标准的http方法，使得支持GET、POST、PUT和DELETE请求。

SpringMVC发送rest风格的PUT和DELETE请求

1、配置HiddenHttpMethodFilter：在web.xml中配置HiddenHttpMethodFilter

  <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>

2、发送Post请求，并携带name=“_method”，value值为PUT或DELETE的隐藏请求域：

<form action="helloworld/1" method="post">
    <input name="_method" type="hidden" value="DELETE" />
    <input type="submit" value="delete请求测试" />
</form>     

<form action="helloworld/2" method="post">
    <input name="_method" type="hidden" value="PUT" />
    <input type="submit" value="put请求测试" />
</form>         

3、控制器中使用@PathVariable注解解析请求携带的参数

package com.gisxx.handlers;

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
public class HelloWorld {

    @RequestMapping(value="/helloworld/{id}",method=RequestMethod.PUT)
    public String testPut(@PathVariable Integer i){
        System.out.println("发送PUT请求："+i);
        return "success";
    }

    @RequestMapping(value="/helloworld/{id}",method=RequestMethod.DELETE)
    public String testDelete(@PathVariable Integer i){
        System.out.println("发送DELETE请求："+i);
        return "success";
    }

}

@PathVariable可以将请求url中的占位符转化为方法可用的参数，这对SpringMVC向REST目标挺进发展具有里程碑意义

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