Spring MVC restful风格之put and delete

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由于浏览器不支持PUT和DELETE方法，那么我们如何通过Spring实现PUT和DELETE的rest风格呢？

步骤一：

在web.xml中添加一个Spring的过滤器HiddenHttpMethodFilter，对DispatcherServlet进行预处理

        <!-- spring mvc 实现delete、put的restful风格过滤器 start--><filter><filter-name>HiddenHttpMethodFilter</filter-name><filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter><filter-mapping><filter-name>HiddenHttpMethodFilter</filter-name>                <!-- DispatcherServlet 对应的servlet-name-->                <servlet-name>dispatcher</servlet-name>        </filter-mapping>        <!-- spring mvc 实现delete、put的restful风格过滤器 end-->

步骤二：

向后台提交请求时，将请求类型设置为“POST”，同时向后台传递一个参数"_method"，参数值可以设置为PUT或DELETE

Demo：ajax 删除restful风格

       deleteById:function(id,callback){//基础验证var url = controllerUtil.controllers.deleteById;if(url.trim().length<=0){throw new Error("please init controllerUtil.controllers.deleteById first.");}console.log("id:"+id);$.ajax({url : url+"/"+id,type : "POST",data : {_method:"DELETE"},dataType : "json",async : true,success : function(ajaxResult) {callback(ajaxResult);},error : function(error) {alert("error");}});}

    /**     * 删除节点     * @param node     * @return     */    @RequestMapping(value="/node/{id}",method=RequestMethod.DELETE)    @ResponseBody    public AjaxResult deleteTreeNode(@PathVariable("id")Long id) {        getService().deleteById(id);        return AjaxResult.getInstance();    }

以下是Spring过滤器的实现：

public class HiddenHttpMethodFilter extends OncePerRequestFilter {/** Default method parameter: {@code _method} */public static final String DEFAULT_METHOD_PARAM = "_method";private String methodParam = DEFAULT_METHOD_PARAM;/** * Set the parameter name to look for HTTP methods. * @see #DEFAULT_METHOD_PARAM */public void setMethodParam(String methodParam) {Assert.hasText(methodParam, "'methodParam' must not be empty");this.methodParam = methodParam;}@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {String paramValue = request.getParameter(this.methodParam);if ("POST".equals(request.getMethod()) && StringUtils.hasLength(paramValue)) {String method = paramValue.toUpperCase(Locale.ENGLISH);HttpServletRequest wrapper = new HttpMethodRequestWrapper(request, method);filterChain.doFilter(wrapper, response);}else {filterChain.doFilter(request, response);}}/** * Simple {@link HttpServletRequest} wrapper that returns the supplied method for * {@link HttpServletRequest#getMethod()}. */private static class HttpMethodRequestWrapper extends HttpServletRequestWrapper {private final String method;public HttpMethodRequestWrapper(HttpServletRequest request, String method) {super(request);this.method = method;}@Overridepublic String getMethod() {return this.method;}}}

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