imageviewer.java

这是我自己做的一个简单的图片浏览器

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();
	}
}
class ImageViewerFrame extends JFrame
{
	private JLabel label;
	private JFileChooser chooser;
	private static final int DEFAULT_WIDTH=300;
	private static final int DEFAULT_HEIGHT=400;
	
	public ImageViewerFrame()
	{
		setTitle("ImageViewer");
		setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
		//use a label 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 lable
				if(r==JFileChooser.APPROVE_OPTION)
				{
					String name=chooser.getSelectedFile().getPath();
					label.setIcon(new ImageIcon(name));
				}
			}
		});
	}

}