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一个浏览图片程序

import javax.swing.*;

import java.awt.Graphics;

import java.awt.*;

import java.awt.event.*;

public class ImageViewer extends JFrame{

Image imageFirst;//初始图像

ImagePanel panel=new ImagePanel();//用来显示图像的panel

JMenuBar jmb=new JMenuBar();

JMenu file=new JMenu("File");

JMenu modify=new JMenu("Modify");

JMenuItem open=new JMenuItem("open");

JMenuItem exit=new JMenuItem("exit");

ButtonGroup bg=new ButtonGroup();

JRadioButtonMenuItem rate1=new JRadioButtonMenuItem("to 50%");//这三个菜单项

JRadioButtonMenuItem rate2=new JRadioButtonMenuItem("to 100%");//用来改变图像

JRadioButtonMenuItem rate3=new JRadioButtonMenuItem("to 200%");//显示的大年夜小

JToolBar toolbar=new JToolBar();//只有一个button简单的toolbar

JButton button=new JButton("A JToolBar Contain A Jbutton");

ImageViewer(){

this.getContentPane().setLayout(null);

this.setBounds(200,200,500,400);

this.setResizable(false);

this.setTitle("ImageViewer");

imageFirst=java.awt.Toolkit.getDefaultToolkit().getImage("images/opean.gif");

panel.setImage(imageFirst);

jmb.add(file);

jmb.add(modify);

open.addActionListener(new OpenAction());

file.add(open);

file.add(exit);

bg.add(rate1); bg.add(rate2); bg.add(rate3);

modify.add(rate1);

modify.add(rate2); rate2.setSelected(true);

modify.add(rate3);

rate1.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(rate1.isSelected()==true){

panel.setRate(0.5);

System.out.println("rate1 been selected!");

panel.repaint();

}

}

});

rate2.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(rate2.isSelected()==true){

panel.setRate(1);

System.out.println("rate2 been selected!");

panel.repaint();

}

}

});

rate3.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(rate3.isSelected()==true){

panel.setRate(2);

System.out.println("rate3 been selected!");

panel.repaint();

}

}

});

exit.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

System.exit(0);

}});

this.setJMenuBar(jmb);

panel.setBounds(0,30,this.getWidth(),this.getHeight()-60);

this.getContentPane().add(panel);

button.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

JOptionPane.showMessageDialog(null,this);

}

});

toolbar.add(button);

toolbar.setLayout(new GridLayout());

toolbar.setBackground(Color.blue);

toolbar.setBounds(0,0,500,30);

this.getContentPane().add(toolbar);

}//SwingDemo1

//主措施

public static void main(String argv[]){

JFrame.setDefaultLookAndFeelDecorated(true);

ImageViewer app=new ImageViewer();

app.setVisible(true);

app.repaint();

}

//内部类 菜单项opean处置惩罚事故

class OpenAction implements ActionListener{

public void actionPerformed(ActionEvent e){

JFileChooser fc = new JFileChooser();

int returnVal = fc.showDialog(new ImageViewer(), "Open file");

String file = fc.getSelectedFile().getPath();

panel.setImage(file);

panel.repaint();

System.out.println("open file action performed");

}

}

}

//外部类  Panel用来显示image

class ImagePanel extends JPanel

{

private Image image;

private double rate=1;

Dimension offDimension;

Image offImage;

Graphics offGraphics;

ImagePanel(){

this.setBackground(Color.blue);

}

public void update(Graphics g){

if(image!=null){

g.drawImage(image,0,0,

(int)(this.getWidth()*rate/2),(int)(this.getHeight()*rate/2),

this.getRootPane());

}

else

{g.setColor(Color.red);

g.fillRect(0,0,(int)(250*rate),(int)(200*rate));

}

}

public void paint(Graphics g){

update(g);

}

public void setImage(Image image){

this.image=image;

}

public void setRate(double rate){

this.rate=rate;

}

public void setImage(String s){

this.image=java.awt.Toolkit.getDefaultToolkit().getImage(s);

}

}

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