java - 在 GWT Java 应用程序中加载 View /创建页面的正确方法是什么

Question

我现在正在检查我的代码以确保其正确且一致。我直接发现我以两种不同的方式加载 View : 一是:

public HikeRecordView() {   

    //On load of page get the stored view data and create the page
    verticalPanel.addAttachHandler(new Handler() {
        public void onAttachOrDetach(AttachEvent event) {
            if (event.isAttached()) {

                rpc = (DBConnectionAsync) GWT.create(DBConnection.class);
                ServiceDefTarget target = (ServiceDefTarget) rpc;
                String moduleRelativeURL = GWT.getModuleBaseURL() + "MySQLConnection";
                target.setServiceEntryPoint(moduleRelativeURL);

                horizontalPanel_Existing.clear();
                verticalPanel.clear();

                AsyncCallback<ViewData> callback = new ViewDataHandler<ViewData>(HikeRecordView.this);
                rpc.getViewData(callback);  
            }
        }
    });
    initWidget(verticalPanel);
}

另一个是:

public PackHolidayView() {  
    rpc = (DBConnectionAsync) GWT.create(DBConnection.class);
    ServiceDefTarget target = (ServiceDefTarget) rpc;
    String moduleRelativeURL = GWT.getModuleBaseURL() + "MySQLConnection";
    target.setServiceEntryPoint(moduleRelativeURL);

    //On load of page render the page
    verticalPanel.addAttachHandler(new Handler() {
        public void onAttachOrDetach(AttachEvent event) {
            verticalPanel.clear();
            verticalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);

            //On load of page get the Account Level and ID of the account holder.
            AsyncCallback<ViewData> callback = new ViewDataHandler<ViewData>(PackHolidayView.this);
            rpc.getViewData(callback);
        }
    });
    initWidget(verticalPanel);
}

它们似乎都可以工作，那么哪种是加载 View 的最佳/推荐方式？

Answer 1

您应该考虑在模型、 View 和演示者之间拆分代码。创建适当的图层。考虑使用 GIN 进行依赖注入(inject)。

阅读此处的文章:http://www.canoo.com/blog/2011/04/05/gwt-dependency-injection-recipes-using-gin/