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

You can easily call a Restful web services using RestyGWT in your GWT application by creating proxy service interface:

import javax.ws.rs.POST;
...
public interface PizzaService extends RestService {
    @POST
    public void order(PizzaOrder request, 
                      MethodCallback callback);
}

or when you don't want to go through the trouble of creating service interfaces:

Resource resource = new Resource( GWT.getModuleBaseURL() + "pizza-service");

JSONValue request = ...

resource.post().json(request).send(new JsonCallback() {
    public void onSuccess(Method method, JSONValue response) {
        System.out.println(response);
    }
    public void onFailure(Method method, Throwable exception) {
        Window.alert("Error: "+exception);
    }
});

It has also got nice API for encoding and decoding Java Object to JSON.