This article is about integrating GWT with Grails. Here, GWT makes request to the Grails server which then returns a JSON object back to the GWT client.

Here’s a way to do post using GWT

RequestBuilder rb = new RequestBuilder(RequestBuilder.POST,
 "http://localhost:9098/json/json/jsontest");
rb.setHeader("Content-Type",
                   "application/x-www-form-urlencoded");
try
{
    rb.sendRequest("jsontext="+hellothere.toString(),
                          new DateCallbackHandler());
}
catch (RequestException e) {
    Window.alert(e.toString());
}

By the way, its calling a controller of a grails project.

Here’s how it handles it

def jsontest = {
   String _json = (params.jsontext)?
                         params.jsontext:'{"JSON":"text"}'
   JSONObject obj = new JSONObject(_json)
   render obj.getString("JSON")
}

Edit:

Mary, you should be able to find that info somewhere on the web. Essentially, you create a RequestBuilder, send a request using

sendRequest(java.lang.String requestData, RequestCallback callback)

callback should be a class that inherits RequestCallback interface. Now RequestCallback has a method

onResponseReceived(Request request, Response response)

that you should implement, and Response has some methods like getText() that you can use.

Cheers

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