HiddenHttpMethodFilter过滤器—SpringMVC

不念不忘少年蓝@ 2022-06-11 09:38 418阅读 0赞

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：

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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