查看 这个链接这解释了如何使用 GWT 编写登录应用程序

Have a look at this link This explains how do you write login app using GWT

或者在代码中..如果你有 MyProfilePlace,MyProfileView 那么 MyProfileActivity 看起来像

Or as in Code..If you have MyProfilePlace,MyProfileView then MyProfileActivity will look like

private ClientFactory clientFactory;

      public MyProfileActivity(MyProfilePlace place, ClientFactory clientFactory) {

    this.clientFactory = clientFactory;

 }

@Override
public void start(AcceptsOneWidget containerWidget, EventBus eventBus) {

            //pseudo code
    if (session invalidated {
        Window.alert("Sorry you are not logged in");
        goTo(new LoginPlace("login"));
    }

    view = clientFactory.getMyProfileView();
    view.setPresenter(this);
    containerWidget.setWidget(view.asWidget());
    System.out.println("Going to your profile");
}