ajax post请求 400 请求报错 

function getContent(){        $.post(                "post/list_json.jspx",                {first:first,count:count,systemmsg:'c114'},                function(data) {},            "json"        );     } @RequestMapping(value="/post/list_json.jspx",method = RequestMethod.POST)     public void getJsonList(Integer first,Integer count,String ,systemmsgHttpServletRequest request,HttpServletResponse  response) {         }   严重: Servlet.service() for servlet [JeeBbsFront] in context with path [/sdmcbbs] threw exception [Request method 'POST' not supported] with root cause org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported     at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodResolver.resolveHandlerMethod(AnnotationMethodHandlerAdapter.java:623)     at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:421)     at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)