1. $("#myForm").submit(function(){
2.       $.post(
3.             "./MyAction.do?cmd=updateDb",
4.             { name:'panda', age:'23' },
5.             function(text,state) { alert ("StatusCode:"+state ); },
6.             "application/json"
7.       );
8.       return false
9. });

When myForm is submit. jsp send json to server. I want to know what server-side should do to get the json.. I try this code but not work. It tell 'reader.readline() is null'

2. public class myAction extends DispatchAction{
3.       public ActionForward updateDb (ActionMapping mapping,
4. ActionForm form,
5. HttpServletRequest request,
6. HttpServletResponse response) throws Exception {
7.             String jsonString = readJSONStringFromRequestBody(request);
8.      }
9.       private String readJSONStringFromRequestBody(HttpServletRequest request) throws Exception{
10.              StringBuffer json = new StringBuffer();
11.       String line = null;
13.       try{
14.       BufferedReader reader = request.getReader();
15.       while((line=reader.readLine()) != null ){
16. json.append(line);
17.       }
18.       }catch(Exception e){
19.       throw new Exception("Error Reading JSON string:"+e.toString());
20.       }
21.       return "";
22.       }
23. }

Anyone please help me. sorry for my english.