这是一个java版的截图程序，效果好不好试试就知道。
package com.hongyuan.test;
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.filechooser.FileSystemView;
/**
* 本程序完成一个基本的屏幕截取任务，用户可以选择截取的范围并保存到文件。
*
* 1.本次修改实现了用户按Esc时退出程序的功能。
* 2.重新组织了程序，使结构和可读性更好。（起码我认为是这样）
* 3.使用一个去掉装饰的JFrame替代JWindow来实现主窗体。（主要原因在于，JWindow无法实现键盘事件监听。暂不明原因）
*/
public class ScreenShotTest_v3 {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
ScreenShotFrame frame=new ScreenShotFrame();
frame.setVisible(true);
} catch (AWTException e) {
System.out.println("初始化程序失败！！！！");
e.printStackTrace();
}
}
});
}
}
/*
* 主窗口
*/
class ScreenShotFrame extends JFrame
{
private ShotImagePanel imagePanel=null; //截图面板
private ActionPanel actionPanel=null; //操作面板
public ScreenShotFrame() throws AWTException{
this.setLayout(null); //设置布局管理器（这里设置为null是为了便于操作面板定位）
this.setUndecorated(true);
this.initComponent();
this.setFullScreen();
this.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
//按键事件，当用户按下（Esc）时退出程序
if(e.getKeyChar()==KeyEvent.VK_ESCAPE){
System.exit(0);
}
}
});
}
//初始化内部组件
private void initComponent() throws AWTException{
try{
//操作面板
actionPanel=new ActionPanel(this);
this.add(actionPanel);
actionPanel.setLocation(0, 0);
//截图面板
imagePanel=new ShotImagePanel(this);
this.add(imagePanel);
}catch(AWTException e) {
throw new AWTException("无法完成界面初始化！");
}
}
//设置窗口为全屏
public void setFullScreen(){
//确保在不支持全屏的环境，也能最大化显示
this.setSize(imagePanel.getSize());
//全屏运行
GraphicsDevice screenDevice = GraphicsEnvironment.
getLocalGraphicsEnvironment().getDefaultScreenDevice();
if(screenDevice.isFullScreenSupported()){
screenDevice.setFullScreenWindow(this);
}
}
//显示操作
public void showActions(int x,int y){
this.actionPanel.setLocation(x,y);
this.actionPanel.setVisible(true);
this.actionPanel.repaint();
}
//隐藏操作
public void hideActions(){
this.actionPanel.setVisible(false);
}
//保存图片
public void saveImage(){
//退出全屏状态
GraphicsDevice screenDevice = GraphicsEnvironment.
getLocalGraphicsEnvironment().getDefaultScreenDevice();
if(screenDevice.isFullScreenSupported()){
screenDevice.setFullScreenWindow(null);
}
try {
this.imagePanel.saveImage();
} catch (IOException e) {
System.out.println("无法完成图片保存操作!");
e.printStackTrace();
}
}
}
//图片面板
class ShotImagePanel extends JPanel
{
private int orgx, orgy, endx, endy;
private BufferedImage image=null;
private BufferedImage tempImage=null;
private BufferedImage saveImage=null;
private ScreenShotFrame parent=null;
public ShotImagePanel(ScreenShotFrame parent) throws AWTException{
this.parent=parent;
//获取屏幕尺寸
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
this.setBounds(0, 0, d.width, d.height);
//截取屏幕
Robot robot = new Robot();
image = robot.createScreenCapture(new Rectangle(0, 0, d.width,d.height));
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
//记录鼠标开始点击的坐标，并隐藏操作面板
orgx = e.getX();
orgy = e.getY();
ShotImagePanel.this.parent.hideActions();
}
@Override
public void mouseReleased(MouseEvent e) {
//重新定位操作面板，并显示
ShotImagePanel.this.parent.showActions(e.getX(),e.getY());
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
//鼠标拖动时，记录坐标并重绘窗口
endx = e.getX();
endy = e.getY();
//临时图像，用于缓冲屏幕区域放置屏幕闪烁
Image tempImage2=createImage(ShotImagePanel.this.getWidth(),ShotImagePanel.this.getHeight());
Graphics g =tempImage2.getGraphics();
g.drawImage(tempImage, 0, 0, null);
int x = Math.min(orgx, endx);
int y = Math.min(orgy, endy);
int width = Math.abs(endx - orgx)+1;
int height = Math.abs(endy - orgy)+1;
// 加上1防止width或height0
g.setColor(Color.BLUE);
g.drawRect(x-1, y-1, width+1, height+1);
//减1加1都了防止图片矩形框覆盖掉
saveImage = image.getSubimage(x, y, width, height);
g.drawImage(saveImage, x, y, null);
ShotImagePanel.this.getGraphics().drawImage(tempImage2,0,0,ShotImagePanel.this);
}
});
}
@Override
public void paint(Graphics g) {
super.paint(g);
RescaleOp ro = new RescaleOp(0.8f, 0, null);
tempImage = ro.filter(image, null);
g.drawImage(tempImage, 0, 0, this);
}
//保存图像到文件
public void saveImage() throws IOException {
JFileChooser jfc=new JFileChooser();
jfc.setDialogTitle("保存");
//文件过滤器，用户过滤可选择文件
FileNameExtensionFilter filter = new FileNameExtensionFilter("JPG", "jpg");
jfc.setFileFilter(filter);
//初始化一个默认文件（此文件会生成到桌面上）
SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss");
String fileName = sdf.format(new Date());
File filePath = FileSystemView.getFileSystemView().getHomeDirectory();
File defaultFile = new File(filePath + File.separator + fileName + ".jpg");
jfc.setSelectedFile(defaultFile);
int flag = jfc.showSaveDialog(this);
if(flag==JFileChooser.APPROVE_OPTION){
File file=jfc.getSelectedFile();
String path=file.getPath();
//检查文件后缀，放置用户忘记输入后缀或者输入不正确的后缀
if(!(path.endsWith(".jpg")||path.endsWith(".JPG"))){
path+=".jpg";
}
//写入文件
ImageIO.write(saveImage,"jpg",new File(path));
}
System.exit(0);
}
}
//操作面板
class ActionPanel extends JPanel
{
public ScreenShotFrame parent=null;
//操作面板默认高度和宽度（因为主窗体不是用布局管理器，如果不显示设置组件高度和宽度默认会为零）
private static final int DEFUATL_WIDTH=63;
private static final int DEFAULT_HEIGHT=32;
public ActionPanel(ScreenShotFrame parent){
this.parent=parent;
this.initComponent();
this.setSize(DEFUATL_WIDTH, DEFAULT_HEIGHT);
this.setVisible(false);
}
private void initComponent(){
this.setLayout(new BorderLayout());
JToolBar actionBar=new JToolBar("Java 截图");
actionBar.setFloatable(false);
//保存按钮
JButton saveButton=new JButton(new ImageIcon("images/save.gif"));
saveButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
ActionPanel.this.parent.saveImage();
}
});
actionBar.add(saveButton);
//关闭按钮
JButton closeButton=new JButton(new ImageIcon("images/close.gif"));
closeButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
actionBar.add(closeButton);
this.add(actionBar,BorderLayout.NORTH);
}
}