程序运行结果：
工程结构图：
程序代码：
import java.awt.BorderLayout;
import java.awt.FileDialog;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
public class PictureViewer extends JFrame implements ActionListener,KeyListener {
/**
* author Silocean
*/
private static final long serialVersionUID = 7249010546054183791L;
// 菜单栏
JMenuBar mb = new JMenuBar();
// 文件菜单
JMenu fileMenu = new JMenu("文件");
// 打开文件菜单项
JMenuItem openMenuItem = new JMenuItem("打开");
// 退出程序菜单项
JMenuItem exitMenuItem = new JMenuItem("退出");
// 关于菜单
JMenu aboutMenu = new JMenu("关于");
// 关于菜单项
JMenuItem aboutMenuItem = new JMenuItem("^(oo)^");
// 上一张图片按钮
JButton bLast = new JButton("上一张");
// 图片数量标签
JLabel lCount = new JLabel();
// 下一张图片按钮
JButton bNext = new JButton("下一张");
// 显示图片的主面板
MyPanel mp = new MyPanel();
// 底部面板
JPanel pSouth = new JPanel();
// 右键菜单
JPopupMenu pm = new JPopupMenu();
// 删除图片菜单项
JMenuItem deleteMenuItem = new JMenuItem("删除");
// 图片属性菜单项
JMenuItem propertyMenuItem = new JMenuItem("属性");
// 文件对话框
FileDialog dialog = new FileDialog(this, "打开文件", FileDialog.LOAD);
// 默认工具包
Toolkit tk = Toolkit.getDefaultToolkit();
// 要显示的图片
Image img = null;
// 用于保存文件夹中所有图片
File[] files = null;
// 图片路径
String fileDir = null;
// 当前图片位置
int indexOfNow = 0;
// 存放图片格式个集合
List<String> imgPatternList = new ArrayList<String>();
// 存放图片路径的集合
List<String> imgList = new ArrayList<String>();
// 当前文件夹中所有图片的数量
int amount = 0;
// 自身的一个引用变量
static PictureViewer pv = null;
/*
* 构造方法初始化窗体
*/
public PictureViewer() {
this.setJMenuBar(mb);
mb.add(fileMenu);
fileMenu.add(openMenuItem);
fileMenu.add(exitMenuItem);
mb.add(aboutMenu);
aboutMenu.add(aboutMenuItem);
this.add(mp, BorderLayout.CENTER);
this.add(pSouth, BorderLayout.SOUTH);
lCount.setText("共" + amount + "张" + "，当前第" + indexOfNow + "张");
pSouth.add(bLast);
pSouth.add(lCount);
pSouth.add(bNext);
pm.add(deleteMenuItem);
pm.add(propertyMenuItem);
openMenuItem.addActionListener(this);
exitMenuItem.addActionListener(this);
aboutMenuItem.addActionListener(this);
bLast.addActionListener(this);
bNext.addActionListener(this);
bLast.addKeyListener(this);
bNext.addKeyListener(this);
deleteMenuItem.addActionListener(this);
propertyMenuItem.addActionListener(this);
imgPatternList.add("JPG");
imgPatternList.add("PNG");
imgPatternList.add("GIF");
/*imgPatternList.add("ICO");
imgPatternList.add("BMP");
imgPatternList.add("TIF");
imgPatternList.add("PCX");
imgPatternList.add("TGA");*/
this.setSize(1000, 650);
this.setTitle("照片查看器");
this.setIconImage(tk.getImage(PictureViewer.class.getClassLoader().getResource("icon.png")));
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == openMenuItem) {
// 打开文件
this.openFile();
} else if(e.getSource() == exitMenuItem) {
// 退出程序
this.exit();
} else if(e.getSource() == aboutMenuItem) {
// 显示关于程序对话框
this.showAboutDialog();
} else if(e.getSource() == bLast) {
// 显示上一张图片
this.lastImg();
} else if(e.getSource() == bNext) {
// 显示下一张图片
this.nextImg();
} else if(e.getSource() == deleteMenuItem) {
// 删除图片
this.deleteImg();
} else if(e.getSource() == propertyMenuItem) {
// 显示图片属性对话框
this.showPropertyDialog();
}
}
/*
* 判断该文件是否为图片
*/
private boolean isImg(File f) {
String postfix = f.toString().substring(f.toString().length()-3, f.toString().length());
Iterator<String> it = imgPatternList.iterator();
while(it.hasNext()) {
String file = it.next();
if(file.equalsIgnoreCase(postfix)) {
return true;
}
}
return false;
}
/*
* 打开文件
*/
private void openFile() {
dialog.setVisible(true);
if(dialog.getFile() != null) {
imgList.removeAll(imgList);
fileDir = dialog.getDirectory();
files = new File(fileDir).listFiles();
if(!this.isImg(new File(dialog.getFile()))) {
JOptionPane.showMessageDialog(this, "不支持所选图片格式！请重新选择");
} else {
img = tk.getImage(fileDir + dialog.getFile());
}
// 把所有属于图片的放在一个集合里
for(int i=0; i<files.length; i++) {
if(files[i].isFile()) {
if(this.isImg(files[i])) {
//System.out.println(files[i]);
imgList.add(files[i].toString());
}
}
}
amount = imgList.size();
// 找出当前图片所在顺序位置
for(int i=0; i<imgList.size(); i++) {
if(imgList.get(i).equals(fileDir+dialog.getFile())) {
indexOfNow = i;
}
}
}
}
/*
* 退出程序
*/
private void exit() {
System.exit(0);
}
/*
* 显示关于程序对话框
*/
private void showAboutDialog() {
JOptionPane.showMessageDialog(
this,
"一个简单的照片查看器" + "\n" + "by TracySilocean",
"关于",
JOptionPane.INFORMATION_MESSAGE,
new ImageIcon(PictureViewer.class.getClassLoader().getResource(
"0.gif")));
}
/*
* 显示上一张图片
*/
private void lastImg() {
if(dialog.getFile() != null) {
if(indexOfNow<=0) {
//JOptionPane.showMessageDialog(this, "已是第一张！");
indexOfNow = imgList.size() - 1;
} else {
indexOfNow -= 1;
}
if(imgList.size() != 0) {
img = tk.getImage(imgList.get(indexOfNow));
}
}
}
/*
* 显示下一张图片
*/
private void nextImg() {
if(dialog.getFile() != null) {
if(indexOfNow>=imgList.size()-1) {
//JOptionPane.showMessageDialog(this, "已是最后一张！");
indexOfNow = 0;
} else {
indexOfNow += 1;
}
if(imgList.size() != 0) {
img = tk.getImage(imgList.get(indexOfNow));
}
}
}
/*
* 删除图片
*/
private void deleteImg() {
int type = JOptionPane.showConfirmDialog(this, "确定要删除这张图片吗？", "删除文件", JOptionPane.YES_NO_OPTION);
if(type == 0) {
new File(imgList.get(indexOfNow)).delete();
imgList.remove(indexOfNow);
if(indexOfNow>=imgList.size()-1) {
indexOfNow = 0;
}
img = tk.getImage(imgList.get(indexOfNow));
} else if(type == 1) {
// 不做任何处理
}
}
/*
* 显示图片属性对话框
*/
private void showPropertyDialog() {
PropertyDialog propertyDialog = new PropertyDialog(this);
propertyDialog.setVisible(true);
}
public static void main(String[] args) {
pv = new PictureViewer();
}
/*
* 显示图片的panel
*/
private class MyPanel extends JPanel implements MouseListener {
public MyPanel() {
this.addMouseListener(this);
new Thread(new PaintThread()).start();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if(dialog.getFile() != null) {
if(pv.isImg(new File(dialog.getFile()))) {
pv.setTitle("照片查看器—" + new File(imgList.get(indexOfNow)).getName());
}
//g.drawString("正在加载……", 450, 270);
lCount.setText("共" + amount + "张" + "，当前第" + (indexOfNow+1) + "张");
int width = img.getWidth(null);
int height = img.getHeight(null);
int centerX = (mp.getWidth()-width)/2;
int centerY = (mp.getHeight()-height)/2;
double scale1 = (double)width/(double)height;
double scale2 = (double)mp.getWidth()/(double)mp.getHeight();
// 根据图片尺寸按需显示图片
if(width>=mp.getWidth() && height<=mp.getHeight()) {
g.drawImage(img, 0, (mp.getHeight()-(height*mp.getWidth()/width))/2, mp.getWidth(), height*mp.getWidth()/width, null);
} else if(width<=mp.getWidth() && height>=mp.getHeight()) {
g.drawImage(img, (mp.getWidth()-(width*mp.getHeight()/height))/2, 0, width*mp.getHeight()/height, mp.getHeight(), null);
} else if(width>=mp.getWidth() && height>=mp.getHeight()) {
if(scale1<scale2) {
g.drawImage(img, (mp.getWidth()-(width*mp.getHeight()/height))/2, 0, width*mp.getHeight()/height, mp.getHeight(), null);
} else {
g.drawImage(img, 0, (mp.getHeight()-(height*mp.getWidth()/width))/2, mp.getWidth(), height*mp.getWidth()/width, null);
}
} else {
g.drawImage(img, centerX, centerY, null);
}
} else {
pv.setTitle("照片查看器");
img = tk.getImage(PictureViewer.class.getClassLoader().getResource("bg.png"));
g.drawImage(img, 0, 0, mp.getWidth(), mp.getHeight(), null);
}
}
/*
* 不断刷新图片面板的线程
*/
class PaintThread implements Runnable {
@Override
public void run() {
while(true) {
repaint();
try {
Thread.sleep(20);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
@Override
public void mouseReleased(MouseEvent e) {
if(dialog.getFile() != null) {
if(e.getButton() == MouseEvent.BUTTON3) {
pm.show(e.getComponent(), e.getX(), e.getY());
}
}
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
switch(key) {
case KeyEvent.VK_UP:
case KeyEvent.VK_LEFT:
this.lastImg();
break;
case KeyEvent.VK_DOWN:
case KeyEvent.VK_RIGHT:
this.nextImg();
break;
}
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
import java.awt.GridLayout;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.JDialog;
import javax.swing.JLabel;
public class PropertyDialog extends JDialog {
PictureViewer mf = null;
JLabel lName = new JLabel("", JLabel.CENTER);
JLabel lSize = new JLabel("", JLabel.CENTER);
JLabel lLocation = new JLabel("", JLabel.CENTER);
JLabel lLength = new JLabel("", JLabel.CENTER);
JLabel lTime = new JLabel("", JLabel.CENTER);
File f = null;
public PropertyDialog(PictureViewer mf) {
f = new File(mf.imgList.get(mf.indexOfNow));
this.mf = mf;
this.setLayout(new GridLayout(5, 1));
this.add(lName);
this.add(lSize);
this.add(lLocation);
this.add(lLength);
this.add(lTime);
lName.setText("名称："+ f.getName());
lSize.setText("图片尺寸：" + mf.img.getWidth(null) + "X" + mf.img.getHeight(null) + " 像素（宽X高）");
lLocation.setText("位置：" + f.getAbsolutePath());
lLength.setText("文件大小：" + f.length()/1024 + "KB");
lTime.setText("修改时间：" + this.getTime());
this.setBounds(500, 300, 400, 200);
}
public String getTime() {
Calendar c = Calendar.getInstance();
long lastTime = f.lastModified();
c.setTimeInMillis(lastTime);
Date d = c.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd hh:mm");
return sdf.format(d);
}
}
【J2SE】java实现简单照片查看器,布布扣,bubuko.com
原文地址：http://blog.csdn.net/tracysilocean/article/details/26816351
