Java中照片加载以及与窗体缩放（不损失像素）

package java;

import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class Java {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                JFrame frame = new ImageViewerFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

class ImageViewerFrame extends JFrame {

    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);
        

        //利用添加控件尺寸监视并重新加载图片防止损失像素

 
        openItem.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
                int result = chooser.showOpenDialog(null);
                if (result == JFileChooser.APPROVE_OPTION) {
                    String name = chooser.getSelectedFile().getPath();
                    ImageIcon image = new ImageIcon(name);
                    
                    image.setImage(image.getImage().getScaledInstance(label.getWidth(), label.getHeight(), Image.SCALE_FAST));
                    label.setIcon(image);
                    addComponentListener(new ComponentAdapter() {
                        public void componentResized(ComponentEvent e) {
                            ImageIcon image = new ImageIcon(name);
                            image.setImage(image.getImage().getScaledInstance(label.getWidth(), label.getHeight(), Image.SCALE_DEFAULT));
                            label.setIcon(image);
                        }
                    });

                }
            }
        });
        exitItem.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
                System.exit(0);
            }
        });
    }
    private JLabel label;
    private JFileChooser chooser;
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 400;
}