自定义JOptionPane对话框 [英] Customize JOptionPane Dialog

问题描述

我正在学习java swing。下面的代码是一个catch块，它处理IOException并显示错误消息。

I am learning java swing. The code below is a catch block which handles an IOException and shows a error message.

 catch(IOException e)
    {
        System.out.println("IOException");
        JOptionPane.showMessageDialog(null,"File not found",null,
                                    JOptionPane.ERROR_MESSAGE);
    }

我正在考虑在catch块中声明和自定义我自己的JOptionPane比如下面的代码：

I was thinking of declaring and customizing a JOptionPane of my own inside the catch block like the code below:

JOptionPane jop=new JOptionPane();
        jop.setLayout(new BorderLayout());
        JLabel im=new JLabel("Java Technology Dive Log",
                new ImageIcon("images/gwhite.gif"),JLabel.CENTER);
        jop.add(im,BorderLayout.NORTH);
        jop.setVisible(true);

但问题是我不知道如何将它作为showMessageDialogue出现在屏幕上方法呢。请帮忙。
提前致谢。

But the problem is that I don't know how to make it appear on the screen as the showMessageDialogue method does. Please help. Thanks in advance.

推荐答案

您只需将组件添加到 JPanel 然后添加这个 JPanel 到您的 JOptionPane ，如下面这个小例子所示：

You can simply add your components to a JPanel and then add this JPanel to your JOptionPane, as shown in this small example :

import java.awt.*;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.*;
import javax.imageio.ImageIO;

public class JOptionPaneExample {

    private void displayGUI() {
        JOptionPane.showConfirmDialog(null,
                        getPanel(),
                        "JOptionPane Example : ",
                        JOptionPane.OK_CANCEL_OPTION,
                        JOptionPane.PLAIN_MESSAGE);
    }

    private JPanel getPanel() {
        JPanel panel = new JPanel();
        JLabel label = new JLabel("Java Technology Dive Log");
        ImageIcon image = null;
        try {
            image = new ImageIcon(ImageIO.read(
                    new URL("http://i.imgur.com/6mbHZRU.png")));
        } catch(MalformedURLException mue) {
            mue.printStackTrace();
        } catch(IOException ioe) {
            ioe.printStackTrace();
        } 

        label.setIcon(image);
        panel.add(label);

        return panel;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new JOptionPaneExample().displayGUI();
            }
        });
    }
}

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