java實現圖片瀏覽：java核心技術學習

2008-03-20 10:11

 

；可以很好的體現出java類庫的具體操作

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

//view picture
public class ImageViewer
{
public static void main(String[] args)
{
   JFrame frame = new ImageViewerFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setVisible(true);
}
}

//display image class

class ImageViewerFrame extends JFrame
{
public ImageViewerFrame()
{
   //add a label to show image
   setTitle("ImageViewer");
   setSize(DEFAULT_WEDTH,DEFAULT_HEIGHT);
   label = new JLabel();
   add(label);

   chooser = new JFileChooser();
   chooser.setCurrentDirectory(new File("."));

   //set menu
   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 event)
    {
     int result = chooser.showOpenDialog(null);
     if (result == 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_WEDTH=300;
private static final int DEFAULT_HEIGHT=300;
}