问在Vaadin 8 web应用程序中作为标题的大标签

EN

final Label labelPlain = new Label ( "This is a plain Label in Vaadin 8.1.0 Alpha 6." );
final Label labelH1 = new Label ( "This is a 'h1' Label in Vaadin 8.1.0 Alpha 6." );
labelH1.addStyleName ( ValoTheme.LABEL_H1 );

package com.example.try_h1;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.themes.ValoTheme;

/**
 * This UI is the application entry point. A UI may either represent a browser window
 * (or tab) or some part of a html page where a Vaadin application is embedded.
 * <p>
 * The UI is initialized using {@link #init(VaadinRequest)}. This method is intended to be
 * overridden to add component to the user interface and initialize non-component functionality.
 */
@Theme ( "mytheme" )
public class MyUI extends UI {

    @Override
    protected void init ( VaadinRequest vaadinRequest ) {
        final VerticalLayout layout = new VerticalLayout ( );

        final Label labelPlain = new Label ( "This is a plain Label in Vaadin 8.1.0 Alpha 6." );
        final Label labelH1 = new Label ( "This is a 'h1' Label in Vaadin 8.1.0 Alpha 6." );
        labelH1.addStyleName ( ValoTheme.LABEL_H1 );

        layout.addComponents ( labelPlain, labelH1 );

        setContent ( layout );
    }

    @WebServlet ( urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true )
    @VaadinServletConfiguration ( ui = MyUI.class, productionMode = false )
    public static class MyUIServlet extends VaadinServlet {
    }
}