springmvc get post put delete

web。xml

<!-- 
    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>

/**
     * 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", 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;
    }

<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>