How to call RESTFUL services from GWT?

Question

I\'m using GWT as web development framework. I need to access some REST services from my GWT client code. Also I need to parse JSON (or maybe XML) which is response format o

Answer 1

The below source of code used RequestBuilder to post a request to RESTFUL Webservice using GWT

JSONObject jsonObject = new JSONObject();

email = (String) vslLoginView.getFieldUserEmailID().getValue();
password = (String) vslLoginView.getFieldUserPasword().getValue();

jsonObject.put("email", new JSONString(email));
jsonObject.put("password", new JSONString(password));
System.out.println("Password at Presenter:"
    + jsonObject.get("password"));
RequestBuilder builder = new RequestBuilder(RequestBuilder.POST,
    RecursosURL.LOGIN.toString()/*your restful webservice url */ + "/authenticateuser");
builder.setHeader("Content-Type", "application/json");
try {
    SC.showPrompt(constants.wait());
    builder.sendRequest(jsonObject.toString(),
        new SamrtWebRequestCallback(false, false, false, false) {

            @Override
            public void onSuccess(Response response) {
                // Recevie response of logged user data from  restful webservice
                JSONObject jsonOnlineUser = JSONParser.parse(
                    response.getText()).isObject();
                UserTO userTO = ConverterUser
                    .converterJSONParaUser(jsonOnlineUser);
                String primaryAccess = jsonOnlineUser.get(
                    "primaryAccess").isString().stringValue();

                HashMap parameters = new HashMap();
                if (primaryAccess.equals("S")) {

                    parameters.put("email", email);
                    parameters.put("password", password);
                    parameters.put("id", jsonOnlineUser.get("id")
                        .isString().stringValue());

                } else {

                    parameters.put("email", email);
                    handlerManager.fireEvent(new EvtIrParaPage(
                        Pages.PAGE_INICIAL, parameters));
                }

            }

            @Override
            protected void onErrorCallbackAdapter(Response response) {
                vslLoginView.getLabelMsgErro().setContents(
                    response.getText());
                vslLoginView.getLabelMsgErro().setVisible(true);
            }
        });

} catch (RequestException e) {
    e.printStackTrace();
}