./TIMWeb/src/main/java/gwt/example01firstlight/client/Example01FirstLight.java

Example01FirstLight.java

package gwt.example01firstlight.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;

import static gwt.example01firstlight.client.Example01FirstLightService.App;

public class Example01FirstLight implements EntryPoint {
    @Override public void onModuleLoad() {
        setupWidgetsForFirstLight();
    }

    private void setupWidgetsForFirstLight() {
        com.google.gwt.user.client.ui.Button button = new com.google.gwt.user.client.ui.Button("Say hello to server...");
        final TextBox textbox = new TextBox();
        final Label output = new Label("");

        button.addClickHandler(new com.google.gwt.event.dom.client.ClickHandler() {
            @Override
            public void onClick(com.google.gwt.event.dom.client.ClickEvent event) {
                App.getInstance().getMessage(textbox.getValue(), new AsyncCallback<String>() {
                    @Override
                    public void onFailure(Throwable caught) {
                        output.setText("Error: failed to connect to server\n" + caught);
                    }

                    @Override
                    public void onSuccess(String result) {
                        output.setText(result);
                    }
                });
            }
        });

        RootPanel.get("gwt_experiment").add(new Label("Enter name: "));
        RootPanel.get("gwt_experiment").add(textbox);
        RootPanel.get("gwt_experiment").add(button);
        RootPanel.get("gwt_experiment").add(output);
    }
}