how to get JSON string by using JsonpRequestBuilder

I am usi开发者_JAVA技巧ng GWT's JsonpRequestBuilder to issue a cross site REST request whose response is a JSON object.

The callback parameter of requestObject method is a JavaScriptObject. but I do not want to implement a JavaScriptObject, but rather to parse the JSON response directly. Is there anyway I can get the JSON string directly from any method of JavaScriptObject or JsonpRequestBuilder ?

If you want to use the com.google.gwt.json.JSON module (seriously, you'd better write JavaScriptObjects, this JSON module is a PITA to work with), then you can simply wrap the returned JavaScriptObject into a JSONObject or JSONArray:

new JSONObject(myJavaScriptObject)

Use requestString instead of requestObject. Like this:

JsonpRequestBuilder jsonp = new JsonpRequestBuilder();
jsonp.requestString(url,
     new AsyncCallback<String>() { ...

This will return a String instead of a JavaScriptObject. You can use then use the JSONParser, like this:

JSONObject value = (JSONObject)JSONParser.parseStrict(jsonString);

Person person = new Person();
person.setName(value.get("Name").isString().stringValue());

@Gu Try to escape quotes in a generated json. For instance in server-side code put

    json = json.replace( "\"", "\\\"" )

Than wrap resulting string as follows:

    String jsonCallback = request.getParameter("jsonpcallback") //or any other name
    StringBuilder response = new StringBuilder();
    responseBody.append( jsonCallback ).append( "(\"" ).append( json ).append( "\");");

This code works for me in client-side:

    JsonpRequestBuilder jsonp = new JsonpRequestBuilder();
    jsonp.setCallbackParam("jsonpcallback");
    jsonp.requestString(....);

P.S. Sorry. Not enough points just to comment already given answer.