/**        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="http://www.mamicode.com/PUT"/>        <input type="submit" value="http://www.mamicode.com/TestRest PUT"/>        </form>        <br><br>            <form action="springmvc/testRest/1" method="post">            <input type="hidden" name="_method" value="http://www.mamicode.com/DELETE"/>            <input type="submit" value="http://www.mamicode.com/TestRest DELETE"/>        </form>        <br><br>                <form action="springmvc/testRest" method="post">            <input type="submit" value="http://www.mamicode.com/TestRest POST"/>        </form>        <br><br>                <a href="http://www.mamicode.com/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;    }