原文转载自：http://www.jb51.net/article/75114.htm
研究的过程中加了一点注释和代码。
方法一：只实现了最简单的截图功能：全屏截图。没有任何可操作的，程序运行，截屏就完成了，也保存了。对截屏的内容几乎没有任何控制，就是点击运行时整个屏幕的样子。代码不多，也挺简单的。
//实现截图功能
import java.awt.Desktop;import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
public class CaptureScreen_1 {
//截图 并保存
public static void captureScreen(String folder,String fileName)throws Exception{
//获得屏幕大小并创建一个Rectangle(区域)
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle screenRectangle = new Rectangle(screenSize);
//创建包含从屏幕中读取的像素的图像
Robot robot = new Robot();
BufferedImage image = robot.createScreenCapture(screenRectangle);
//保存路径
File screenFile = new File(folder);
if(!screenFile.exists()) {
screenFile.mkdir();
}
File f = new File(screenFile,fileName);
//决定了f为文件，将图像1以.png格式写入文件f
ImageIO.write(image, "png", f);
//自动打开
//启动 2345看图王 打开截图
if(Desktop.isDesktopSupported()&&Desktop.getDesktop().isSupported(Desktop.Action.OPEN)) {
Desktop.getDesktop().open(f);
}
}
public static void main(String[] args) {
try {
captureScreen("hello","11.png");
}catch(Exception e){
e.printStackTrace();
}
}
}
方法二：在全屏截图的基础上，实现了截取矩形区域的屏幕。以方法一为基础，其实就相当于对方法一获得的截图进行了截取，截取一个矩形区域。不过，研究一下其中的代码，对于初学者还是挺有意义的，里面有不少东西。我就是初学者，感觉挺有意思的。
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
/**
* 一个简单的屏幕抓图
*
**/
public class CaptureScreen_2{
// test main
public static void main(String[] args) throws Exception {
//获取"user.dir"指定的系统属性
//String userdir = System.getProperty("user.dir");
File tempFile = new File("temp.png");
//获取私有单例并调用捕捉屏幕的方法
CaptureScreen_2 capture = CaptureScreen_2.getInstance();
//捕捉屏幕的一个矩形区域
//先获得全屏的截图
//阻塞？等待事件？
capture.captureImage();
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
JLabel imagebox = new JLabel();
panel.add(BorderLayout.CENTER, imagebox);
//将截图显示到imagebox上
imagebox.setIcon(capture.getPickedIcon());
//保存截图 到文件"tempFile"中
capture.saveToFile(tempFile);
System.out.println("鼠标释放后，获得一个矩形区域，同时"+
"将dialog设为不可见，程序才会\n继续往下运行:"+
"这是第一次获得截图、释放鼠标");
//Thread.currentThread();
//运行两次截屏操作之间的代码所需时间太短
//所以我们感觉dialog是连续出现的，不会看到
//中间输出文字，如果让程序睡一会，就能看见了
Thread.sleep(8000);
//再次截图 一个矩形区域
//同时将dialog设为可见，此时只有发生释放鼠标
//事件后，dialog设为不可见后，程序才会继续往下运行
capture.captureImage();
System.out.println("鼠标释放后，获得一个矩形区域，同时"+
"将dialog设为不可见，程序才会\n继续往下运行:"+
"这是第二次获得截图、释放鼠标");
//将截图显示在屏幕中 没有保存
//每次释放鼠标就会更新pickedImage pickedIcon
imagebox.setIcon(capture.getPickedIcon());
frame.setContentPane(panel);
frame.setSize(400, 300);
frame.setTitle("Second Image");
frame.show();
System.out.println("Over");
//capture.dialog.setVisible(false);
}
//为了运行线程 是不是要有一个公有构造器？
public CaptureScreen_2(int i) {
}
//私有构造方法
private CaptureScreen_2() {
try {
//获取robot对象 用于获取包含屏幕像素的图像
robot = new Robot();
} catch (AWTException e) {
System.err.println("Internal Error: " + e);
e.printStackTrace();
}
//
JPanel cp = (JPanel) dialog.getContentPane();
cp.setLayout(new BorderLayout());
//添加鼠标监听器 私有内部类方式
//labFullScreenImage是JLable的子类
labFullScreenImage.addMouseListener(new MouseAdapter() {
//响应释放鼠标事件
public void mouseReleased(MouseEvent evn) {
isFirstPoint = true;//释放鼠标后将isFirstPoint重置为true
//设置pickedImage 获得屏幕的一个矩形区域
pickedImage = fullScreenImage.getSubimage(recX, recY, recW,
recH);
//dialog的作用：两次截屏后程序还在运行
//但是将dialog设为不可见后可以手动技术程序
//不然 没办法退出dialog 也没办法结束程序
//除非注销计算机
dialog.setVisible(false);
}
});
//添加鼠标移动监听器
//labFullScreenImage是JLabel的子类
labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
//响应点击+移动鼠标事件
//此处就是按下鼠标左键并移动鼠标
public void mouseDragged(MouseEvent evn) {
if (isFirstPoint) {
//获得起点 未必是最终起点
x1 = evn.getX();
y1 = evn.getY();
isFirstPoint = false;
} else {
//获得终点 未必是最终终点
x2 = evn.getX();
y2 = evn.getY();
int maxX = Math.max(x1, x2);
int maxY = Math.max(y1, y2);
int minX = Math.min(x1, x2);
int minY = Math.min(y1, y2);
//最终起点
recX = minX;
recY = minY;
//矩形区域的宽和高
recW = maxX - minX;
recH = maxY - minY;
//
labFullScreenImage.drawRectangle(recX, recY, recW, recH);
}
}
//响应mouseMoved事件 直接移动，没有任何点击 没有其他动作
//此处就是简单的移动鼠标 不按下左键
public void mouseMoved(MouseEvent e) {
labFullScreenImage.drawCross(e.getX(), e.getY());
}
});//私有内部类 里面有两个方法
//得到单例时 最先执行以下代码
cp.add(BorderLayout.CENTER, labFullScreenImage);
//dialog为全局变量 程序执行过程中只有一个dialog对象
dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
dialog.setAlwaysOnTop(true);
dialog.setMaximumSize(Toolkit.getDefaultToolkit().getScreenSize());
dialog.setUndecorated(true);
dialog.setSize(dialog.getMaximumSize());
dialog.setModal(true);
//dialog.setTitle("Dialog");
}
// Singleton Pattern
public static CaptureScreen_2 getInstance() {
return defaultCapturer;
}
/** 捕捉全屏慕 */
public Icon captureFullScreen() {
//获取屏幕截图
fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit
.getDefaultToolkit().getScreenSize()));
//将截图装载到icon
ImageIcon icon = new ImageIcon(fullScreenImage);
return icon;
}
/** 捕捉屏幕的一个矫形区域 */
//通过捕捉全屏幕实现的
public void captureImage() {
//获取屏幕截图
fullScreenImage = robot.createScreenCapture(new Rectangle(Toolkit
.getDefaultToolkit().getScreenSize()));
//将截图装载到icon
ImageIcon icon = new ImageIcon(fullScreenImage);
labFullScreenImage.setIcon(icon);
//每次调用此方法 会设置dialog为可见
dialog.setVisible(true);
}
/** 得到捕捉后的BufferedImage */
public BufferedImage getPickedImage() {
return pickedImage;
}
/** 得到捕捉后的Icon */
public ImageIcon getPickedIcon() {
return new ImageIcon(getPickedImage());
}
/**
* 储存为一个文件,为PNG格式
*
* @deprecated replaced by saveAsPNG(File file)
**/
@Deprecated
public void saveToFile(File file) throws IOException {
ImageIO.write(getPickedImage(), defaultImageFormater, file);
}
/** 储存为一个文件,为PNG格式 */
public void saveAsPNG(File file) throws IOException {
ImageIO.write(getPickedImage(), "png", file);
}
/** 储存为一个JPEG格式图像文件 */
public void saveAsJPEG(File file) throws IOException {
ImageIO.write(getPickedImage(), "JPEG", file);
}
/** 写入一个OutputStream */
public void write(OutputStream out) throws IOException {
ImageIO.write(getPickedImage(), defaultImageFormater, out);
}
// singleton design pattern (单例模式)
//使用私有构造函数获得静态私有单例
private static CaptureScreen_2 defaultCapturer = new CaptureScreen_2();
private int x1, y1, x2, y2;
private int recX, recY, recH, recW; // 截取的图像
private boolean isFirstPoint = true;
private BackgroundImage labFullScreenImage = new BackgroundImage();
private Robot robot;
private BufferedImage fullScreenImage;
private BufferedImage pickedImage;
private String defaultImageFormater = "png";
private JDialog dialog = new JDialog();
}
/** 显示图片的Label */
class BackgroundImage extends JLabel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawRect(x, y, w, h);
String area = Integer.toString(w) + " * " + Integer.toString(h);
g.drawString(area, x + (int) w / 2 - 15, y + (int) h / 2);
g.drawLine(lineX, 0, lineX, getHeight());
g.drawLine(0, lineY, getWidth(), lineY);
}
//画矩形
public void drawRectangle(int x, int y, int width, int height) {
this.x = x;
this.y = y;
h = height;
w = width;
repaint();
}
//画十字线（水平线 垂直线 垂直相交）
public void drawCross(int x, int y) {
lineX = x;
lineY = y;
repaint();
}
int lineX, lineY;
int x, y, h, w;
}
方法三：还没有看。但是代码比前两个方法多很多，功能应该也更多吧。
因为有最小化到系统托盘，还是需要一张名为bg.gif作为托盘图标，图片应放在同级目录下，否则会空指针异常。
主要的截屏代码部分是：
Robot ro=new Robot();
Toolkit tk=Toolkit.getDefaultToolkit();
Dimension di=tk.getScreenSize();
Rectangle rec=new Rectangle(0,0,di.width,di.height);
BufferedImage bi=ro.createScreenCapture(rec);
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import javax.imageio.*;
import java.awt.image.*;
public class CaptureScreen extends JFrame implements ActionListener{
private JButton start,cancel,saveAll;
private JPanel c;
private BufferedImage get;
private JTabbedPane jtp;//一个放置很多份图片
private int index;//一个一直会递增的索引,用于标认图片
private JRadioButton java,system;//JAVA界面,系统界面
/** Creates a new instance of CaptureScreen */
public CaptureScreen() {
super("屏幕截取软件(第三版)");
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(Exception exe){
exe.printStackTrace();
}
initWindow();
initOther();
initTrayIcon();
}
private void initOther(){
jtp=new JTabbedPane(JTabbedPane.TOP,JTabbedPane.SCROLL_TAB_LAYOUT);
}
private void initWindow(){
start=new JButton("开始截取");
saveAll=new JButton("保存所有");
cancel=new JButton("退出");
start.addActionListener(this);
saveAll.addActionListener(this);
cancel.addActionListener(this);
JPanel buttonJP=new JPanel();
c=new JPanel(new BorderLayout());
c.setBackground(Color.BLACK);
JLabel jl=new JLabel("屏幕截取",JLabel.CENTER);
jl.setFont(new Font("黑体",Font.BOLD,40));
jl.setForeground(Color.RED);
c.add(jl,BorderLayout.CENTER);
buttonJP.add(start);
buttonJP.add(saveAll);
buttonJP.add(cancel);
buttonJP.setBorder(BorderFactory.createTitledBorder("公共操作区"));
JPanel jp=new JPanel();//放两个单选按钮的面板
jp.add(java=new JRadioButton("java界面"));
jp.add(system=new JRadioButton("系统界面",true));
java.addActionListener(this);
system.addActionListener(this);
jp.setBorder(BorderFactory.createTitledBorder("界面风格"));
ButtonGroup bg=new ButtonGroup();
bg.add(java);
bg.add(system);
JPanel all=new JPanel();
all.add(jp);
all.add(buttonJP);
this.getContentPane().add(c,BorderLayout.CENTER);
this.getContentPane().add(all,BorderLayout.SOUTH);
this.setSize(500,400);
this.setLocationRelativeTo(null);
this.setVisible(true);
this.setAlwaysOnTop(true);
this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){
CaptureScreen.this.setVisible(false);
}
});
}
private void initTrayIcon(){
try{
SystemTray st=SystemTray.getSystemTray();
Image im=ImageIO.read(this.getClass().getResource("bg.gif"));
PopupMenu pm=new PopupMenu("弹出菜单");
pm.add(new MenuItem("关于")).addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
JOptionPane.showMessageDialog(CaptureScreen.this,"<html><Font color=red><center><h2>关于</h2></center></Font>" +
"这是一款纯JAVA的屏幕截取程序<br>在以前的基础上增加了一些常用的功能,<br>" +
"比如,批量保存,多幅截取,复制到系统粘帖板...<br>" +
"在使用过程中有任何问题,欢迎联系.<br>" +
"<Font size=5 color=blue>作者:千里冰封<br>" +
"<i>QQ:24325142</i><br></Font></html>");
}
});
pm.addSeparator();
pm.add(new MenuItem("显示主窗口")).addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
CaptureScreen.this.setVisible(true);
}
});
pm.add(new MenuItem("开始截取")).addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
doStart();
}
});
pm.add(new MenuItem("退出程序")).addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
System.exit(0);
}
});
TrayIcon ti=new TrayIcon(im,"JAVA屏幕截取",pm);
st.add(ti);
ti.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
CaptureScreen.this.setVisible(true);
}
});
}catch(Exception exe){
exe.printStackTrace();
}
}
private void updates(){
this.setVisible(true);
if(get!=null){
//如果索引是0,则表示一张图片都没有被加入过,
//则要清除当前的东西,重新把tabpane放进来
if(index==0){
c.removeAll();
c.add(jtp,BorderLayout.CENTER);
}else{//否则的话,直接对tabpane添加面板就可以了
//就什么都不用做了
}
PicPanel pic=new PicPanel(get);
jtp.addTab("图片"+(++index),pic);
jtp.setSelectedComponent(pic);
SwingUtilities.updateComponentTreeUI(c);
}
}
private void doStart(){
try{
this.setVisible(false);
Thread.sleep(500);//睡500毫秒是为了让主窗完全不见
Robot ro=new Robot();
Toolkit tk=Toolkit.getDefaultToolkit();
Dimension di=tk.getScreenSize();
Rectangle rec=new Rectangle(0,0,di.width,di.height);
BufferedImage bi=ro.createScreenCapture(rec);
JFrame jf=new JFrame();
Temp temp=new Temp(jf,bi,di.width,di.height);
jf.getContentPane().add(temp,BorderLayout.CENTER);
jf.setUndecorated(true);
jf.setSize(di);
jf.setVisible(true);
jf.setAlwaysOnTop(true);
} catch(Exception exe){
exe.printStackTrace();
}
}
/**
*公共方法,处理保存所有的图片
*/
public void doSaveAll(){
if(jtp.getTabCount()==0){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
JFileChooser jfc=new JFileChooser(".");
jfc.addChoosableFileFilter(new GIFfilter());
jfc.addChoosableFileFilter(new BMPfilter());
jfc.addChoosableFileFilter(new JPGfilter());
jfc.addChoosableFileFilter(new PNGfilter());
int i=jfc.showSaveDialog(this);
if(i==JFileChooser.APPROVE_OPTION){
File file=jfc.getSelectedFile();
String about="PNG";
String ext=file.toString().toLowerCase();
javax.swing.filechooser.FileFilter ff=jfc.getFileFilter();
if(ff instanceof JPGfilter){
about="JPG";
} else if(ff instanceof PNGfilter){
about="PNG";
}else if(ff instanceof BMPfilter){
about="BMP";
}else if(ff instanceof GIFfilter){
about="GIF";
}
if(ext.endsWith(about.toLowerCase())){
ext=ext.substring(0,ext.lastIndexOf(about.toLowerCase()));
}
//起一个线程去保存这些图片并显示出进度条
new SaveAllThread(ext,about).setVisible(true);
}
}
//专门用来保存所有图片的线程类,它还要显示出保存的进度条
private class SaveAllThread extends JDialog implements Runnable{
private String name;//文件名头部份
private String ext;//文件格式
private JProgressBar jpb;//一个进度条
private JLabel info;// 一个信息显示条
private int allTask,doneTask;//所有任务,已完成任务
public SaveAllThread(String name,String ext){
super(CaptureScreen.this,"保存",true);
this.name=name;
this.ext=ext;
initWindow();
}
private void initWindow(){
jpb=new JProgressBar();
allTask=jtp.getTabCount();
jpb.setMaximum(allTask);
jpb.setMinimum(0);
jpb.setValue(0);
jpb.setStringPainted(true);
setProgressBarString();
info=new JLabel("正在保存到:");
this.getContentPane().setBackground(Color.CYAN);
this.add(info,BorderLayout.NORTH);
this.add(jpb,BorderLayout.SOUTH);
this.setUndecorated(true);
this.setSize(300,100);
this.setLocationRelativeTo(CaptureScreen.this);
new Thread(this).start();
}
private void setProgressBarString(){
jpb.setString(""+doneTask+"/"+allTask);
}
public void run(){
try{
for(int i=0;i<allTask;i++){
PicPanel pp=(PicPanel)jtp.getComponentAt(i);
BufferedImage image=pp.getImage();
File f= new File(name+(doneTask+1)+"."+ext.toLowerCase());
info.setText("<html><b>正在保存到:</b><br>"+f.toString()+"</html>");
ImageIO.write(image,ext,f);
doneTask++;
jpb.setValue(doneTask);
setProgressBarString();
Thread.sleep(500);
}
JOptionPane.showMessageDialog(this,"保存完毕!!");
this.dispose();
}catch(Exception exe){
exe.printStackTrace();
this.dispose();
}
}
}
/**
*公用的处理保存图片的方法
*这个方法不再私有了
*/
public void doSave(BufferedImage get){
try{
if(get==null){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
JFileChooser jfc=new JFileChooser(".");
jfc.addChoosableFileFilter(new GIFfilter());
jfc.addChoosableFileFilter(new BMPfilter());
jfc.addChoosableFileFilter(new JPGfilter());
jfc.addChoosableFileFilter(new PNGfilter());
int i=jfc.showSaveDialog(this);
if(i==JFileChooser.APPROVE_OPTION){
File file=jfc.getSelectedFile();
String about="PNG";
String ext=file.toString().toLowerCase();
javax.swing.filechooser.FileFilter ff=jfc.getFileFilter();
if(ff instanceof JPGfilter){
about="JPG";
if(!ext.endsWith(".jpg")){
String ns=ext+".jpg";
file=new File(ns);
}
} else if(ff instanceof PNGfilter){
about="PNG";
if(!ext.endsWith(".png")){
String ns=ext+".png";
file=new File(ns);
}
}else if(ff instanceof BMPfilter){
about="BMP";
if(!ext.endsWith(".bmp")){
String ns=ext+".bmp";
file=new File(ns);
}
}else if(ff instanceof GIFfilter){
about="GIF";
if(!ext.endsWith(".gif")){
String ns=ext+".gif";
file=new File(ns);
}
}
if(ImageIO.write(get,about,file)){
JOptionPane.showMessageDialog(this,"保存成功！");
} else
JOptionPane.showMessageDialog(this,"保存失败！");
}
} catch(Exception exe){
exe.printStackTrace();
}
}
/**
*公共的处理把当前的图片加入剪帖板的方法
*/
public void doCopy(final BufferedImage image){
try{
if(get==null){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
Transferable trans = new Transferable(){
public DataFlavor[] getTransferDataFlavors() {
return new DataFlavor[] { DataFlavor.imageFlavor };
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return DataFlavor.imageFlavor.equals(flavor);
}
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if(isDataFlavorSupported(flavor))
return image;
throw new UnsupportedFlavorException(flavor);
}
};
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans, null);
JOptionPane.showMessageDialog(this,"已复制到系统粘帖板!!");
}catch(Exception exe){
exe.printStackTrace();
JOptionPane.showMessageDialog(this,"复制到系统粘帖板出错!!","错误",JOptionPane.ERROR_MESSAGE);
}
}
//处理关闭事件
private void doClose(Component c){
jtp.remove(c);
c=null;
System.gc();
}
public void actionPerformed(ActionEvent ae){
Object source=ae.getSource();
if(source==start){
doStart();
} else if(source==cancel){
System.exit(0);
}else if(source==java){
try{
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exception exe){
exe.printStackTrace();
}
}else if(source==system){
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exception exe){
exe.printStackTrace();
}
}else if(source==saveAll){
doSaveAll();
}
}
//一个内部类,它表示一个面板,一个可以被放进tabpane的面板
//也有自己的一套处理保存和复制的方法
private class PicPanel extends JPanel implements ActionListener{
JButton save,copy,close;//表示保存,复制,关闭的按钮
BufferedImage get;//得到的图片
public PicPanel(BufferedImage get){
super(new BorderLayout());
this.get=get;
initPanel();
}
public BufferedImage getImage(){
return get;
}
private void initPanel(){
save=new JButton("保存(S)");
copy=new JButton("复制到剪帖板(C)");
close=new JButton("关闭(X)");
save.setMnemonic('S');
copy.setMnemonic('C');
close.setMnemonic('X');
JPanel buttonPanel=new JPanel();
buttonPanel.add(copy);
buttonPanel.add(save);
buttonPanel.add(close);
JLabel icon=new JLabel(new ImageIcon(get));
this.add(new JScrollPane(icon),BorderLayout.CENTER);
this.add(buttonPanel,BorderLayout.SOUTH);
save.addActionListener(this);
copy.addActionListener(this);
close.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
Object source=e.getSource();
if(source==save){
doSave(get);
}else if(source==copy){
doCopy(get);
}else if(source==close){
get=null;
doClose(this);
}
}
}
//保存BMP格式的过滤器
private class BMPfilter extends javax.swing.filechooser.FileFilter{
public BMPfilter(){
}
public boolean accept(File file){
if(file.toString().toLowerCase().endsWith(".bmp")||
file.isDirectory()){
return true;
} else
return false;
}
public String getDescription(){
return "*.BMP(BMP图像)";
}
}
//保存JPG格式的过滤器
private class JPGfilter extends javax.swing.filechooser.FileFilter{
public JPGfilter(){
}
public boolean accept(File file){
if(file.toString().toLowerCase().endsWith(".jpg")||
file.isDirectory()){
return true;
} else
return false;
}
public String getDescription(){
return "*.JPG(JPG图像)";
}
}
//保存GIF格式的过滤器
private class GIFfilter extends javax.swing.filechooser.FileFilter{
public GIFfilter(){
}
public boolean accept(File file){
if(file.toString().toLowerCase().endsWith(".gif")||
file.isDirectory()){
return true;
} else
return false;
}
public String getDescription(){
return "*.GIF(GIF图像)";
}
}
//保存PNG格式的过滤器
private class PNGfilter extends javax.swing.filechooser.FileFilter{
public boolean accept(File file){
if(file.toString().toLowerCase().endsWith(".png")||
file.isDirectory()){
return true;
} else
return false;
}
public String getDescription(){
return "*.PNG(PNG图像)";
}
}
//一个暂时类，用于显示当前的屏幕图像
private class Temp extends JPanel implements MouseListener,MouseMotionListener{
private BufferedImage bi;
private int width,height;
private int startX,startY,endX,endY,tempX,tempY;
private JFrame jf;
private Rectangle select=new Rectangle(0,0,0,0);//表示选中的区域
private Cursor cs=new Cursor(Cursor.CROSSHAIR_CURSOR);//表示一般情况下的鼠标状态
private States current=States.DEFAULT;// 表示当前的编辑状态
private Rectangle[] rec;//表示八个编辑点的区域
//下面四个常量,分别表示谁是被选中的那条线上的端点
public static final int START_X=1;
public static final int START_Y=2;
public static final int END_X=3;
public static final int END_Y=4;
private int currentX,currentY;//当前被选中的X和Y,只有这两个需要改变
private Point p=new Point();//当前鼠标移的地点
private boolean showTip=true;//是否显示提示.如果鼠标左键一按,则提示不再显了
public Temp(JFrame jf,BufferedImage bi,int width,int height){
this.jf=jf;
this.bi=bi;
this.width=width;
this.height=height;
this.addMouseListener(this);
this.addMouseMotionListener(this);
initRecs();
}
private void initRecs(){
rec=new Rectangle[8];
for(int i=0;i<rec.length;i++){
rec[i]=new Rectangle();
}
}
public void paintComponent(Graphics g){
g.drawImage(bi,0,0,width,height,this);
g.setColor(Color.RED);
g.drawLine(startX,startY,endX,startY);
g.drawLine(startX,endY,endX,endY);
g.drawLine(startX,startY,startX,endY);
g.drawLine(endX,startY,endX,endY);
int x=startX<endX?startX:endX;
int y=startY<endY?startY:endY;
select=new Rectangle(x,y,Math.abs(endX-startX),Math.abs(endY-startY));
int x1=(startX+endX)/2;
int y1=(startY+endY)/2;
g.fillRect(x1-2,startY-2,5,5);
g.fillRect(x1-2,endY-2,5,5);
g.fillRect(startX-2,y1-2,5,5);
g.fillRect(endX-2,y1-2,5,5);
g.fillRect(startX-2,startY-2,5,5);
g.fillRect(startX-2,endY-2,5,5);
g.fillRect(endX-2,startY-2,5,5);
g.fillRect(endX-2,endY-2,5,5);
rec[0]=new Rectangle(x-5,y-5,10,10);
rec[1]=new Rectangle(x1-5,y-5,10,10);
rec[2]=new Rectangle((startX>endX?startX:endX)-5,y-5,10,10);
rec[3]=new Rectangle((startX>endX?startX:endX)-5,y1-5,10,10);
rec[4]=new Rectangle((startX>endX?startX:endX)-5,(startY>endY?startY:endY)-5,10,10);
rec[5]=new Rectangle(x1-5,(startY>endY?startY:endY)-5,10,10);
rec[6]=new Rectangle(x-5,(startY>endY?startY:endY)-5,10,10);
rec[7]=new Rectangle(x-5,y1-5,10,10);
if(showTip){
g.setColor(Color.CYAN);
g.fillRect(p.x,p.y,170,20);
g.setColor(Color.RED);
g.drawRect(p.x,p.y,170,20);
g.setColor(Color.BLACK);
g.drawString("请按住鼠标左键不放选择截图区",p.x,p.y+15);
}
}
//根据东南西北等八个方向决定选中的要修改的X和Y的座标
private void initSelect(States state){
switch(state){
case DEFAULT:
currentX=0;
currentY=0;
break;
case EAST:
currentX=(endX>startX?END_X:START_X);
currentY=0;
break;
case WEST:
currentX=(endX>startX?START_X:END_X);
currentY=0;
break;
case NORTH:
currentX=0;
currentY=(startY>endY?END_Y:START_Y);
break;
case SOUTH:
currentX=0;
currentY=(startY>endY?START_Y:END_Y);
break;
case NORTH_EAST:
currentY=(startY>endY?END_Y:START_Y);
currentX=(endX>startX?END_X:START_X);
break;
case NORTH_WEST:
currentY=(startY>endY?END_Y:START_Y);
currentX=(endX>startX?START_X:END_X);
break;
case SOUTH_EAST:
currentY=(startY>endY?START_Y:END_Y);
currentX=(endX>startX?END_X:START_X);
break;
case SOUTH_WEST:
currentY=(startY>endY?START_Y:END_Y);
currentX=(endX>startX?START_X:END_X);
break;
default:
currentX=0;
currentY=0;
break;
}
}
public void mouseMoved(MouseEvent me){
doMouseMoved(me);
initSelect(current);
if(showTip){
p=me.getPoint();
repaint();
}
}
//特意定义一个方法处理鼠标移动,是为了每次都能初始化一下所要选择的地区
private void doMouseMoved(MouseEvent me){
if(select.contains(me.getPoint())){
this.setCursor(new Cursor(Cursor.MOVE_CURSOR));
current=States.MOVE;
} else{
States[] st=States.values();
for(int i=0;i<rec.length;i++){
if(rec[i].contains(me.getPoint())){
current=st[i];
this.setCursor(st[i].getCursor());
return;
}
}
this.setCursor(cs);
current=States.DEFAULT;
}
}
public void mouseExited(MouseEvent me){
}
public void mouseEntered(MouseEvent me){
}
public void mouseDragged(MouseEvent me){
int x=me.getX();
int y=me.getY();
if(current==States.MOVE){
startX+=(x-tempX);
startY+=(y-tempY);
endX+=(x-tempX);
endY+=(y-tempY);
tempX=x;
tempY=y;
}else if(current==States.EAST||current==States.WEST){
if(currentX==START_X){
startX+=(x-tempX);
tempX=x;
}else{
endX+=(x-tempX);
tempX=x;
}
}else if(current==States.NORTH||current==States.SOUTH){
if(currentY==START_Y){
startY+=(y-tempY);
tempY=y;
}else{
endY+=(y-tempY);
tempY=y;
}
}else if(current==States.NORTH_EAST||current==States.NORTH_EAST||
current==States.SOUTH_EAST||current==States.SOUTH_WEST){
if(currentY==START_Y){
startY+=(y-tempY);
tempY=y;
}else{
endY+=(y-tempY);
tempY=y;
}
if(currentX==START_X){
startX+=(x-tempX);
tempX=x;
}else{
endX+=(x-tempX);
tempX=x;
}
}else{
startX=tempX;
startY=tempY;
endX=me.getX();
endY=me.getY();
}
this.repaint();
}
public void mousePressed(MouseEvent me){
showTip=false;
tempX=me.getX();
tempY=me.getY();
}
public void mouseReleased(MouseEvent me){
if(me.isPopupTrigger()){
if(current==States.MOVE){
showTip=true;
p=me.getPoint();
startX=0;
startY=0;
endX=0;
endY=0;
repaint();
} else{
jf.dispose();
updates();
}
}
}
public void mouseClicked(MouseEvent me){
if(me.getClickCount()==2){
//Rectangle rec=new Rectangle(startX,startY,Math.abs(endX-startX),Math.abs(endY-startY));
Point p=me.getPoint();
if(select.contains(p)){
if(select.x+select.width<this.getWidth()&&select.y+select.height<this.getHeight()){
get=bi.getSubimage(select.x,select.y,select.width,select.height);
jf.dispose();
updates();
}else{
int wid=select.width,het=select.height;
if(select.x+select.width>=this.getWidth()){
wid=this.getWidth()-select.x;
}
if(select.y+select.height>=this.getHeight()){
het=this.getHeight()-select.y;
}
get=bi.getSubimage(select.x,select.y,wid,het);
jf.dispose();
updates();
}
}
}
}
}
public static void main(String args[]){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
new CaptureScreen();
}
});
}
}
//一些表示状态的枚举
enum States{
NORTH_WEST(new Cursor(Cursor.NW_RESIZE_CURSOR)),//表示西北角
NORTH(new Cursor(Cursor.N_RESIZE_CURSOR)),
NORTH_EAST(new Cursor(Cursor.NE_RESIZE_CURSOR)),
EAST(new Cursor(Cursor.E_RESIZE_CURSOR)),
SOUTH_EAST(new Cursor(Cursor.SE_RESIZE_CURSOR)),
SOUTH(new Cursor(Cursor.S_RESIZE_CURSOR)),
SOUTH_WEST(new Cursor(Cursor.SW_RESIZE_CURSOR)),
WEST(new Cursor(Cursor.W_RESIZE_CURSOR)),
MOVE(new Cursor(Cursor.MOVE_CURSOR)),
DEFAULT(new Cursor(Cursor.DEFAULT_CURSOR));
private Cursor cs;
States(Cursor cs){
this.cs=cs;
}
public Cursor getCursor(){
return cs;
}
}