如何在Swing中顯示帶有自定義圖示的訊息對話方塊?


以下範例展示如何在基於swing的應用程式中顯示帶有自定義圖示的訊息警告。

使用以下API -

  • JOptionPane - 建立標準對話方塊。
  • JOptionPane.showMessageDialog() - 顯示訊息警報。
  • ImageIcon - 將圖示傳遞給訊息對話方塊。

範例

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class SwingTester {
   public static void main(String[] args) {
      createWindow();
   }

   private static void createWindow() {    
      JFrame frame = new JFrame("Swing Tester");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      createUI(frame);
      frame.setSize(560, 200);      
      frame.setLocationRelativeTo(null);  
      frame.setVisible(true);
   }

   private static void createUI(final JFrame frame){  
      JPanel panel = new JPanel();
      LayoutManager layout = new FlowLayout();  
      panel.setLayout(layout);       
      JButton button = new JButton("Click Me!");
      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            ImageIcon arrowIcon = null;
            java.net.URL imgURL = SwingTester.class.getResource("arrow.jpg");
            if (imgURL != null) {
               arrowIcon = new ImageIcon(imgURL);  
            }
            JOptionPane.showMessageDialog(frame, "Welcome to Swing",
               "Swing Tester", JOptionPane.PLAIN_MESSAGE, arrowIcon);
         }
      });

      panel.add(button);
      frame.getContentPane().add(panel, BorderLayout.CENTER);    
   }  
}

執行上面範例程式碼,得到以下結果: