Spring MVC 使用HiddenHttpMethodFilter配置Rest风格的URL

Posted 2020-08-06 胖头猫

/**
        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. 需要在web.xml文件中配置 HiddenHttpMethodFilter 
        <!-- 
            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>
        
        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
        jsp文件如下：
        <form action="springmvc/testRest/1" method="post">
        <input type="hidden" name="_method" value="PUT"/>
        <input type="submit" value="TestRest PUT"/>
        </form>
        <br><br>
    
        <form action="springmvc/testRest/1" method="post">
            <input type="hidden" name="_method" value="DELETE"/>
            <input type="submit" value="TestRest DELETE"/>
        </form>
        <br><br>
        
        <form action="springmvc/testRest" method="post">
            <input type="submit" value="TestRest POST"/>
        </form>
        <br><br>
        
        <a href="springmvc/testRest/1">Test Rest Get</a>
        <br><br>
      
      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", 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;
    }

    /**
     * @PathVariable 可以来映射 URL 中的占位符到目标方法的参数中.
     * @param id
     * @return
     */
    @RequestMapping("/testPathVariable/{id}")
    public String testPathVariable(@PathVariable("id") Integer id) {
        System.out.println("testPathVariable: " + id);
        return SUCCESS;
    }

    @RequestMapping("/testAntPath/*/abc")
    public String testAntPath() {
        System.out.println("testAntPath");
        return SUCCESS;
    }