打开图片并显示在面板上demo

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class ImageViewerFrame extends JFrame{
	 	private JLabel label;//私有标签
	     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);
	    			label=new JLabel();
	    			add(label);
	    			chooser=new JFileChooser();
	    			chooser.setCurrentDirectory(new File("."));
	    			JMenuBar menubar=new JMenuBar();
	    			setJMenuBar(menubar);
	    			JMenu menu=new JMenu("File");
	    			menubar.add(menu);
	    			JMenuItem openItem=new JMenuItem("Open");
	    			menu.add(openItem);
	    			JMenuItem exitItem=new JMenuItem("Close");
	    			menu.add(exitItem);
	    			openItem.addActionListener(new ActionListener() {
						
						@Override
						public void actionPerformed(ActionEvent e) {
							int result=chooser.showOpenDialog(null);
							if(result==JFileChooser.APPROVE_OPTION){
								String name=chooser.getSelectedFile().getPath();
								label.setIcon(new ImageIcon(name));
							}
							
						}
					});
	    			exitItem.addActionListener(new ActionListener() {
						
						@Override
						public void actionPerformed(ActionEvent e) {
							System.out.println(0);
							
						}
					});
	    			
	    		}
	    	
	     public static void main(String[] args) {
			EventQueue.invokeLater(new Runnable() {
				
				@Override
				public void run() {
					JFrame frame=new ImageViewerFrame();
					frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
					frame.setVisible(true);
				}
			});
		}
	     
}