imageviewer.java

ssd3的教程 是我们老师给我们的 纯英文 有兴趣的可以

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

/**
 * A program for viewing images.
 */
public class ImageViewer
{
	public static void main(String[] args)
	{
		JFrame frame = new ImageViewerFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}

/**
 * A frame with a label to show an image.
 */
class ImageViewerFrame extends JFrame
{
	public ImageViewerFrame()
	{
		setTitle("ImageViewer");
		setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);

		//use a lable to display the images
		label = new JLabel();
		Container contentPane = getContentPane();
		contentPane.add(label);

		//set up the file chooser
		chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));

		//set up the menu bar
		JMenuBar menuBar = new JMenuBar();
		setJMenuBar(menuBar);

		JMenu menu = new JMenu("File");
		menuBar.add(menu);

		JMenuItem openItem = new JMenuItem("Open");
		menu.add(openItem);
		openItem.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent evt)
			{
				//show file chooser dialog
				int r = chooser.showOpenDialog(null);

				//if file selected,set it as icon of the label
				if(r == JFileChooser.APPROVE_OPTION)
				{
					String name
					= chooser.getSelectedFile().getPath();
					label.setIcon(new ImageIcon(name));
				}
			}
		});

		JMenuItem exitItem = new JMenuItem("EXIT");
		menu.add(exitItem);
		exitItem.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent event)
			{
				System.exit(0);
			}
		});
	}

	private JLabel label;
	private JFileChooser chooser;
	private static final int DEFAULT_WIDTH = 1000;
	private static final int DEFAULT_HEIGHT = 700;	
}