Customize JOptionPane Dialog

问题

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);
    }

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);

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.

回答1:

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();
            }
        });
    }
}

回答2:

I guess that depends on what's wrong with JOptionPaneshowMessageDialog(Component parentComponent, Object message, String title, int messageType, Icon icon)?

JOptionPane.showMessageDialog(null, "Java Technolgy Dive Log", "Dive", JOptionPane.INFORMATION_MESSAGE, new ImageIcon("images/gwhite.gif"));

回答3:

JOptionPane jop = new JOptionPane();
JDialog dialog = jop.createDialog("File not found");
dialog.setLayout(new BorderLayout());
JLabel im = new JLabel("Java Technology Dive Log", new ImageIcon("images/gwhite.gif"), JLabel.CENTER);
dialog.add(im, BorderLayout.NORTH);
dialog.setVisible(true);

来源：https://stackoverflow.com/questions/12234850/customize-joptionpane-dialog

标签

java

swing

jlabel

joptionpane

imageicon