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POJSON Message post from GWT to Spring MVC Controller
 

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    <p>I am trying to post a JSON message from GWT to a Controller in Spring MVC Framework. The spring controller is receiving request from GWT, but when I print out the request content length and request.toString(), it shows 0 for the content lenght and the output of the request.toString() does not have any content.</p> <p><strong>The following is my codes and output:</strong></p> <p>The following is my GWT code that perform the posting of JSON message :</p> <pre><code>@UiHandler("saveButton") void onClick(ClickEvent e) { UserAddJSO jso = (UserAddJSO)JavaScriptObject.createObject().cast(); jso.setFirstName("Alex"); jso.setLastName("Cheng"); RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, "addUser.aj"); builder.setHeader("Content-Type", "application/json"); builder.setRequestData(new JSONObject(jso).toString()); System.out.println("request data :"+builder.getRequestData()); try { builder.sendRequest(null, new RequestCallback() { public void onError(Request request, Throwable exception) { Window.alert("on error"); } public void onResponseReceived(Request request, Response response) { Window.alert("response received :"+response.getStatusCode()); Window.alert(response.getText()); } }); } catch (RequestException excp) { Window.alert("exception catched"); } } </code></pre> <p>from the above code you can see i have a print out on the request data, the json string is there.</p> <p>there following is my Spring controller:</p> <pre><code>@RequestMapping(value = "**/addUser.aj", method = RequestMethod.POST, produces = "application/json") @ResponseBody public List&lt;UserAddDTO&gt; getPostStocks(HttpServletRequest request, HttpServletResponse response) throws IOException { List&lt;UserAddDTO&gt; userDTO = new ArrayList&lt;UserAddDTO&gt;(); JSONObject jObj; jObj = new JSONObject(request.getParameterMap()); System.out.println(jObj.toString()); System.out.println("xxxxxxxxxxxxx "+request.toString()); System.out.println("content type :"+request.getContentType()); System.out.println("inside post method"); return userDTO; } </code></pre> <p>The following is the output from the above print out :</p> <pre><code>request data :{"firstName":"Alex", "lastName":"Cheng"} content type :application/json content length :0 inside post method {} xxxxxxxxxxxxx POST /addUser.aj HTTP/1.1 Accept: */* Referer: http://127.0.0.1:8888/AlliumApp.html?gwt.codesvr=127.0.0.1:9997 Accept-Language: en-us User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; OfficeLiveConnector.1.3; OfficeLivePatch.0.0; Tablet PC 2.0; BRI/2) Accept-Encoding: gzip, deflate Host: 127.0.0.1:8888 Connection: Keep-Alive Content-Type: application/json Content-Length: 0 Cache-Control: no-cache </code></pre> <p>from the above output you can see the JSON message is there inside the request. But when it reached the controller the JSON message is not there anymore. So am i doing the right way for json message posting and receiving?</p>
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