java编程实现屏幕截图(截屏)代码总结
本文实例总结了常见的java编程实现屏幕截图方法。分享给大家供大家参考，具体如下：
方法一：
importjava.awt.Desktop;
importjava.awt.Dimension;
importjava.awt.Rectangle;
importjava.awt.Robot;
importjava.awt.Toolkit;
importjava.awt.image.BufferedImage;
importjava.io.File;
importjavax.imageio.ImageIO;
publicclassCaptureScreen{
publicstaticvoidcaptureScreen(StringfileName,Stringfolder)throwsException{
DimensionscreenSize=Toolkit.getDefaultToolkit().getScreenSize();
RectanglescreenRectangle=newRectangle(screenSize);
Robotrobot=newRobot();
BufferedImageimage=robot.createScreenCapture(screenRectangle);
//保存路径
FilescreenFile=newFile(fileName);
if(!screenFile.exists()){
screenFile.mkdir();
}
Filef=newFile(screenFile,folder);
ImageIO.write(image,"png",f);
//自动打开
if(Desktop.isDesktopSupported()
&&Desktop.getDesktop().isSupported(Desktop.Action.OPEN))
Desktop.getDesktop().open(f);
}
publicstaticvoidmain(String[]args){
try{
captureScreen("e:\\你好","11.png");
}catch(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
方法二：
packagecom.qiu.util;
importjava.io.*;
importjavax.swing.*;
importjava.awt.*;
importjava.awt.event.*;
importjava.awt.image.*;
importjavax.imageio.*;
/**
*一个简单的屏幕抓图
*
**/
publicclassScreenCapture{
//testmain
publicstaticvoidmain(String[]args)throwsException{
Stringuserdir=System.getProperty("user.dir");
FiletempFile=newFile("d:","temp.png");
ScreenCapturecapture=ScreenCapture.getInstance();
capture.captureImage();
JFrameframe=newJFrame();
JPanelpanel=newJPanel();
panel.setLayout(newBorderLayout());
JLabelimagebox=newJLabel();
panel.add(BorderLayout.CENTER,imagebox);
imagebox.setIcon(capture.getPickedIcon());
capture.saveToFile(tempFile);
capture.captureImage();
imagebox.setIcon(capture.getPickedIcon());
frame.setContentPane(panel);
frame.setSize(400,300);
frame.show();
System.out.println("Over");
}
privateScreenCapture(){
try{
robot=newRobot();
}catch(AWTExceptione){
System.err.println("InternalError:"+e);
e.printStackTrace();
}
JPanelcp=(JPanel)dialog.getContentPane();
cp.setLayout(newBorderLayout());
labFullScreenImage.addMouseListener(newMouseAdapter(){
publicvoidmouseReleased(MouseEventevn){
isFirstPoint=true;
pickedImage=fullScreenImage.getSubimage(recX,recY,recW,
recH);
dialog.setVisible(false);
}
});
labFullScreenImage.addMouseMotionListener(newMouseMotionAdapter(){
publicvoidmouseDragged(MouseEventevn){
if(isFirstPoint){
x1=evn.getX();
y1=evn.getY();
isFirstPoint=false;
}else{
x2=evn.getX();
y2=evn.getY();
intmaxX=Math.max(x1,x2);
intmaxY=Math.max(y1,y2);
intminX=Math.min(x1,x2);
intminY=Math.min(y1,y2);
recX=minX;
recY=minY;
recW=maxX-minX;
recH=maxY-minY;
labFullScreenImage.drawRectangle(recX,recY,recW,recH);
}
}
publicvoidmouseMoved(MouseEvente){
labFullScreenImage.drawCross(e.getX(),e.getY());
}
});
cp.add(BorderLayout.CENTER,labFullScreenImage);
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);
}
//SingletonPattern
publicstaticScreenCapturegetInstance(){
returndefaultCapturer;
}
/**捕捉全屏慕*/
publicIconcaptureFullScreen(){
fullScreenImage=robot.createScreenCapture(newRectangle(Toolkit
.getDefaultToolkit().getScreenSize()));
ImageIconicon=newImageIcon(fullScreenImage);
returnicon;
}
/**捕捉屏幕的一个矫形区域*/
publicvoidcaptureImage(){
fullScreenImage=robot.createScreenCapture(newRectangle(Toolkit
.getDefaultToolkit().getScreenSize()));
ImageIconicon=newImageIcon(fullScreenImage);
labFullScreenImage.setIcon(icon);
dialog.setVisible(true);
}
/**得到捕捉后的BufferedImage*/
publicBufferedImagegetPickedImage(){
returnpickedImage;
}
/**得到捕捉后的Icon*/
publicImageIcongetPickedIcon(){
returnnewImageIcon(getPickedImage());
}
/**
*储存为一个文件,为PNG格式
*
*@deprecatedreplacedbysaveAsPNG(Filefile)
**/
@Deprecated
publicvoidsaveToFile(Filefile)throwsIOException{
ImageIO.write(getPickedImage(),defaultImageFormater,file);
}
/**储存为一个文件,为PNG格式*/
publicvoidsaveAsPNG(Filefile)throwsIOException{
ImageIO.write(getPickedImage(),"png",file);
}
/**储存为一个JPEG格式图像文件*/
publicvoidsaveAsJPEG(Filefile)throwsIOException{
ImageIO.write(getPickedImage(),"JPEG",file);
}
/**写入一个OutputStream*/
publicvoidwrite(OutputStreamout)throwsIOException{
ImageIO.write(getPickedImage(),defaultImageFormater,out);
}
//singletondesignpattern
privatestaticScreenCapturedefaultCapturer=newScreenCapture();
privateintx1,y1,x2,y2;
privateintrecX,recY,recH,recW;//截取的图像
privatebooleanisFirstPoint=true;
privateBackgroundImagelabFullScreenImage=newBackgroundImage();
privateRobotrobot;
privateBufferedImagefullScreenImage;
privateBufferedImagepickedImage;
privateStringdefaultImageFormater="png";
privateJDialogdialog=newJDialog();
}
/**显示图片的Label*/
classBackgroundImageextendsJLabel{
publicvoidpaintComponent(Graphicsg){
super.paintComponent(g);
g.drawRect(x,y,w,h);
Stringarea=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);
}
publicvoiddrawRectangle(intx,inty,intwidth,intheight){
this.x=x;
this.y=y;
h=height;
w=width;
repaint();
}
publicvoiddrawCross(intx,inty){
lineX=x;
lineY=y;
repaint();
}
intlineX,lineY;
intx,y,h,w;
}
方法三：
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：
Robotro=newRobot(); Toolkittk=Toolkit.getDefaultToolkit(); Dimensiondi=tk.getScreenSize(); Rectanglerec=newRectangle(0,0,di.width,di.height); BufferedImagebi=ro.createScreenCapture(rec);
(源代码来源于CSDN)
importjava.awt.*;
importjava.awt.datatransfer.DataFlavor;
importjava.awt.datatransfer.Transferable;
importjava.awt.datatransfer.UnsupportedFlavorException;
importjava.awt.event.*;
importjavax.swing.*;
importjava.io.*;
importjavax.imageio.*;
importjava.awt.image.*;
publicclassCaptureScreenextendsJFrameimplementsActionListener{
privateJButtonstart,cancel,saveAll;
privateJPanelc;
privateBufferedImageget;
privateJTabbedPanejtp;//一个放置很多份图片
privateintindex;//一个一直会递增的索引,用于标认图片
privateJRadioButtonjava,system;//JAVA界面,系统界面
/**CreatesanewinstanceofCaptureScreen*/
publicCaptureScreen(){
super("屏幕截取软件(第三版)");
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(Exceptionexe){
exe.printStackTrace();
}
initWindow();
initOther();
initTrayIcon();
}
privatevoidinitOther(){
jtp=newJTabbedPane(JTabbedPane.TOP,JTabbedPane.SCROLL_TAB_LAYOUT);
}
privatevoidinitWindow(){
start=newJButton("开始截取");
saveAll=newJButton("保存所有");
cancel=newJButton("退出");
start.addActionListener(this);
saveAll.addActionListener(this);
cancel.addActionListener(this);
JPanelbuttonJP=newJPanel();
c=newJPanel(newBorderLayout());
c.setBackground(Color.BLACK);
JLabeljl=newJLabel("屏幕截取",JLabel.CENTER);
jl.setFont(newFont("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"));
JPaneljp=newJPanel();//放两个单选按钮的面板
jp.add(java=newJRadioButton("java界面"));
jp.add(system=newJRadioButton("系统界面",true));
java.addActionListener(this);
system.addActionListener(this);
jp.setBorder(BorderFactory.createTitledBorder("界面风格"));
ButtonGroupbg=newButtonGroup();
bg.add(java);
bg.add(system);
JPanelall=newJPanel();
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(newWindowAdapter(){
publicvoidwindowClosing(WindowEventwe){
CaptureScreen.this.setVisible(false);
}
});
}
privatevoidinitTrayIcon(){
try{
SystemTrayst=SystemTray.getSystemTray();
Imageim=ImageIO.read(this.getClass().getResource("bg.gif"));
PopupMenupm=newPopupMenu("弹出菜单");
pm.add(newMenuItem("关于")).addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
JOptionPane.showMessageDialog(CaptureScreen.this,"<html><Fontcolor=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>"+
"<Fontsize=5color=blue>作者:千里冰封<br>"+
"<i>QQ:24325142</i><br></Font></html>");
}
});
pm.addSeparator();
pm.add(newMenuItem("显示主窗口")).addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
CaptureScreen.this.setVisible(true);
}
});
pm.add(newMenuItem("开始截取")).addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
doStart();
}
});
pm.add(newMenuItem("退出程序")).addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
System.exit(0);
}
});
TrayIconti=newTrayIcon(im,"JAVA屏幕截取",pm);
st.add(ti);
ti.addActionListener(newActionListener(){
publicvoidactionPerformed(ActionEventae){
CaptureScreen.this.setVisible(true);
}
});
}catch(Exceptionexe){
exe.printStackTrace();
}
}
privatevoidupdates(){
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
}
PicPanelpic=newPicPanel(get);
jtp.addTab("图片"+(++index),pic);
jtp.setSelectedComponent(pic);
SwingUtilities.updateComponentTreeUI(c);
}
}
privatevoiddoStart(){
try{
this.setVisible(false);
Thread.sleep(500);//睡500毫秒是为了让主窗完全不见
Robotro=newRobot();
Toolkittk=Toolkit.getDefaultToolkit();
Dimensiondi=tk.getScreenSize();
Rectanglerec=newRectangle(0,0,di.width,di.height);
BufferedImagebi=ro.createScreenCapture(rec);
JFramejf=newJFrame();
Temptemp=newTemp(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(Exceptionexe){
exe.printStackTrace();
}
}
/**
*公共方法,处理保存所有的图片
*/
publicvoiddoSaveAll(){
if(jtp.getTabCount()==0){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
JFileChooserjfc=newJFileChooser(".");
jfc.addChoosableFileFilter(newGIFfilter());
jfc.addChoosableFileFilter(newBMPfilter());
jfc.addChoosableFileFilter(newJPGfilter());
jfc.addChoosableFileFilter(newPNGfilter());
inti=jfc.showSaveDialog(this);
if(i==JFileChooser.APPROVE_OPTION){
Filefile=jfc.getSelectedFile();
Stringabout="PNG";
Stringext=file.toString().toLowerCase();
javax.swing.filechooser.FileFilterff=jfc.getFileFilter();
if(ffinstanceofJPGfilter){
about="JPG";
}elseif(ffinstanceofPNGfilter){
about="PNG";
}elseif(ffinstanceofBMPfilter){
about="BMP";
}elseif(ffinstanceofGIFfilter){
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
newSaveAllThread(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
privateclassSaveAllThreadextendsJDialogimplementsRunnable{
privateStringname;//文件名头部份
privateStringext;//文件格式
privateJProgressBarjpb;//一个进度条
privateJLabelinfo;//一个信息显示条
privateintallTask,doneTask;//所有任务,已完成任务
publicSaveAllThread(Stringname,Stringext){
super(CaptureScreen.this,"保存",true);
this.name=name;
this.ext=ext;
initWindow();
}
privatevoidinitWindow(){
jpb=newJProgressBar();
allTask=jtp.getTabCount();
jpb.setMaximum(allTask);
jpb.setMinimum(0);
jpb.setValue(0);
jpb.setStringPainted(true);
setProgressBarString();
info=newJLabel("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);
newThread(this).start();
}
privatevoidsetProgressBarString(){
jpb.setString(""+doneTask+"/"+allTask);
}
publicvoidrun(){
try{
for(inti=0;i<allTask;i++){
PicPanelpp=(PicPanel)jtp.getComponentAt(i);
BufferedImageimage=pp.getImage();
Filef=newFile(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(Exceptionexe){
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
*/
publicvoiddoSave(BufferedImageget){
try{
if(get==null){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
JFileChooserjfc=newJFileChooser(".");
jfc.addChoosableFileFilter(newGIFfilter());
jfc.addChoosableFileFilter(newBMPfilter());
jfc.addChoosableFileFilter(newJPGfilter());
jfc.addChoosableFileFilter(newPNGfilter());
inti=jfc.showSaveDialog(this);
if(i==JFileChooser.APPROVE_OPTION){
Filefile=jfc.getSelectedFile();
Stringabout="PNG";
Stringext=file.toString().toLowerCase();
javax.swing.filechooser.FileFilterff=jfc.getFileFilter();
if(ffinstanceofJPGfilter){
about="JPG";
if(!ext.endsWith(".jpg")){
Stringns=ext+".jpg";
file=newFile(ns);
}
}elseif(ffinstanceofPNGfilter){
about="PNG";
if(!ext.endsWith(".png")){
Stringns=ext+".png";
file=newFile(ns);
}
}elseif(ffinstanceofBMPfilter){
about="BMP";
if(!ext.endsWith(".bmp")){
Stringns=ext+".bmp";
file=newFile(ns);
}
}elseif(ffinstanceofGIFfilter){
about="GIF";
if(!ext.endsWith(".gif")){
Stringns=ext+".gif";
file=newFile(ns);
}
}
if(ImageIO.write(get,about,file)){
JOptionPane.showMessageDialog(this,"保存成功！");
}else
JOptionPane.showMessageDialog(this,"保存失败！");
}
}catch(Exceptionexe){
exe.printStackTrace();
}
}
/**
*公共的处理把当前的图片加入剪帖板的方法
*/
publicvoiddoCopy(finalBufferedImageimage){
try{
if(get==null){
JOptionPane.showMessageDialog(this,"图片不能为空!!","错误",JOptionPane.ERROR_MESSAGE);
return;
}
Transferabletrans=newTransferable(){
publicDataFlavor[]getTransferDataFlavors(){
returnnewDataFlavor[]{DataFlavor.imageFlavor};
}
publicbooleanisDataFlavorSupported(DataFlavorflavor){
returnDataFlavor.imageFlavor.equals(flavor);
}
publicObjectgetTransferData(DataFlavorflavor)throwsUnsupportedFlavorException,IOException{
if(isDataFlavorSupported(flavor))
returnimage;
thrownewUnsupportedFlavorException(flavor);
}
};
Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans,null);
JOptionPane.showMessageDialog(this,"已复制到系统粘帖板!!");
}catch(Exceptionexe){
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
privatevoiddoClose(Componentc){
jtp.remove(c);
c=null;
System.gc();
}
publicvoidactionPerformed(ActionEventae){
Objectsource=ae.getSource();
if(source==start){
doStart();
}elseif(source==cancel){
System.exit(0);
}elseif(source==java){
try{
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exceptionexe){
exe.printStackTrace();
}
}elseif(source==system){
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exceptionexe){
exe.printStackTrace();
}
}elseif(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
privateclassPicPanelextendsJPanelimplementsActionListener{
JButtonsave,copy,close;//表示保存,复制,关闭的按钮
BufferedImageget;//得到的图片
publicPicPanel(BufferedImageget){
super(newBorderLayout());
this.get=get;
initPanel();
}
publicBufferedImagegetImage(){
returnget;
}
privatevoidinitPanel(){
save=newJButton("保存(S)");
copy=newJButton("复制到剪帖板(C)");
close=newJButton("关闭(X)");
save.setMnemonic('S');
copy.setMnemonic('C');
close.setMnemonic('X');
JPanelbuttonPanel=newJPanel();
buttonPanel.add(copy);
buttonPanel.add(save);
buttonPanel.add(close);
JLabelicon=newJLabel(newImageIcon(get));
this.add(newJScrollPane(icon),BorderLayout.CENTER);
this.add(buttonPanel,BorderLayout.SOUTH);
save.addActionListener(this);
copy.addActionListener(this);
close.addActionListener(this);
}
publicvoidactionPerformed(ActionEvente){
Objectsource=e.getSource();
if(source==save){
doSave(get);
}elseif(source==copy){
doCopy(get);
}elseif(source==close){
get=null;
doClose(this);
}
}
}
//保存BMP格式的过滤器
privateclassBMPfilterextendsjavax.swing.filechooser.FileFilter{
publicBMPfilter(){
}
publicbooleanaccept(Filefile){
if(file.toString().toLowerCase().endsWith(".bmp")||
file.isDirectory()){
returntrue;
}else
returnfalse;
}
publicStringgetDescription(){
return"*.BMP(BMP图像)";
}
}
//保存JPG格式的过滤器
privateclassJPGfilterextendsjavax.swing.filechooser.FileFilter{
publicJPGfilter(){
}
publicbooleanaccept(Filefile){
if(file.toString().toLowerCase().endsWith(".jpg")||
file.isDirectory()){
returntrue;
}else
returnfalse;
}
publicStringgetDescription(){
return"*.JPG(JPG图像)";
}
}
//保存GIF格式的过滤器
privateclassGIFfilterextendsjavax.swing.filechooser.FileFilter{
publicGIFfilter(){
}
publicbooleanaccept(Filefile){
if(file.toString().toLowerCase().endsWith(".gif")||
file.isDirectory()){
returntrue;
}else
returnfalse;
}
publicStringgetDescription(){
return"*.GIF(GIF图像)";
}
}
//保存PNG格式的过滤器
privateclassPNGfilterextendsjavax.swing.filechooser.FileFilter{
publicbooleanaccept(Filefile){
if(file.toString().toLowerCase().endsWith(".png")||
file.isDirectory()){
returntrue;
}else
returnfalse;
}
publicStringgetDescription(){
return"*.PNG(PNG图像)";
}
}
//一个暂时类，用于显示当前的屏幕图像
privateclassTempextendsJPanelimplementsMouseListener,MouseMotionListener{
privateBufferedImagebi;
privateintwidth,height;
privateintstartX,startY,endX,endY,tempX,tempY;
privateJFramejf;
privateRectangleselect=newRectangle(0,0,0,0);//表示选中的区域
privateCursorcs=newCursor(Cursor.CROSSHAIR_CURSOR);//表示一般情况下的鼠标状态
privateStatescurrent=States.DEFAULT;//表示当前的编辑状态
privateRectangle[]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
publicstaticfinalintSTART_X=1;
publicstaticfinalintSTART_Y=2;
publicstaticfinalintEND_X=3;
publicstaticfinalintEND_Y=4;
privateintcurrentX,currentY;//当前被选中的X和Y,只有这两个需要改变
privatePointp=newPoint();//当前鼠标移的地点
privatebooleanshowTip=true;//是否显示提示.如果鼠标左键一按,则提示不再显了
publicTemp(JFramejf,BufferedImagebi,intwidth,intheight){
this.jf=jf;
this.bi=bi;
this.width=width;
this.height=height;
this.addMouseListener(this);
this.addMouseMotionListener(this);
initRecs();
}
privatevoidinitRecs(){
rec=newRectangle[8];
for(inti=0;i<rec.length;i++){
rec[i]=newRectangle();
}
}
publicvoidpaintComponent(Graphicsg){
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);
intx=startX<endX?startX:endX;
inty=startY<endY?startY:endY;
select=newRectangle(x,y,Math.abs(endX-startX),Math.abs(endY-startY));
intx1=(startX+endX)/2;
inty1=(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]=newRectangle(x-5,y-5,10,10);
rec[1]=newRectangle(x1-5,y-5,10,10);
rec[2]=newRectangle((startX>endX?startX:endX)-5,y-5,10,10);
rec[3]=newRectangle((startX>endX?startX:endX)-5,y1-5,10,10);
rec[4]=newRectangle((startX>endX?startX:endX)-5,(startY>endY?startY:endY)-5,10,10);
rec[5]=newRectangle(x1-5,(startY>endY?startY:endY)-5,10,10);
rec[6]=newRectangle(x-5,(startY>endY?startY:endY)-5,10,10);
rec[7]=newRectangle(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
privatevoidinitSelect(Statesstate){
switch(state){
caseDEFAULT:
currentX=0;
currentY=0;
break;
caseEAST:
currentX=(endX>startX?END_X:START_X);
currentY=0;
break;
caseWEST:
currentX=(endX>startX?START_X:END_X);
currentY=0;
break;
caseNORTH:
currentX=0;
currentY=(startY>endY?END_Y:START_Y);
break;
caseSOUTH:
currentX=0;
currentY=(startY>endY?START_Y:END_Y);
break;
caseNORTH_EAST:
currentY=(startY>endY?END_Y:START_Y);
currentX=(endX>startX?END_X:START_X);
break;
caseNORTH_WEST:
currentY=(startY>endY?END_Y:START_Y);
currentX=(endX>startX?START_X:END_X);
break;
caseSOUTH_EAST:
currentY=(startY>endY?START_Y:END_Y);
currentX=(endX>startX?END_X:START_X);
break;
caseSOUTH_WEST:
currentY=(startY>endY?START_Y:END_Y);
currentX=(endX>startX?START_X:END_X);
break;
default:
currentX=0;
currentY=0;
break;
}
}
publicvoidmouseMoved(MouseEventme){
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
privatevoiddoMouseMoved(MouseEventme){
if(select.contains(me.getPoint())){
this.setCursor(newCursor(Cursor.MOVE_CURSOR));
current=States.MOVE;
}else{
States[]st=States.values();
for(inti=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;
}
}
publicvoidmouseExited(MouseEventme){
}
publicvoidmouseEntered(MouseEventme){
}
publicvoidmouseDragged(MouseEventme){
intx=me.getX();
inty=me.getY();
if(current==States.MOVE){
startX+=(x-tempX);
startY+=(y-tempY);
endX+=(x-tempX);
endY+=(y-tempY);
tempX=x;
tempY=y;
}elseif(current==States.EAST||current==States.WEST){
if(currentX==START_X){
startX+=(x-tempX);
tempX=x;
}else{
endX+=(x-tempX);
tempX=x;
}
}elseif(current==States.NORTH||current==States.SOUTH){
if(currentY==START_Y){
startY+=(y-tempY);
tempY=y;
}else{
endY+=(y-tempY);
tempY=y;
}
}elseif(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();
}
publicvoidmousePressed(MouseEventme){
showTip=false;
tempX=me.getX();
tempY=me.getY();
}
publicvoidmouseReleased(MouseEventme){
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();
}
}
}
publicvoidmouseClicked(MouseEventme){
if(me.getClickCount()==2){
//Rectanglerec=newRectangle(startX,startY,Math.abs(endX-startX),Math.abs(endY-startY));
Pointp=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{
intwid=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();
}
}
}
}
}
publicstaticvoidmain(Stringargs[]){
SwingUtilities.invokeLater(newRunnable(){
publicvoidrun(){
newCaptureScreen();
}
});
}
}
//一些表示状态的枚举
enumStates{
NORTH_WEST(newCursor(Cursor.NW_RESIZE_CURSOR)),//表示西北角
NORTH(newCursor(Cursor.N_RESIZE_CURSOR)),
NORTH_EAST(newCursor(Cursor.NE_RESIZE_CURSOR)),
EAST(newCursor(Cursor.E_RESIZE_CURSOR)),
SOUTH_EAST(newCursor(Cursor.SE_RESIZE_CURSOR)),
SOUTH(newCursor(Cursor.S_RESIZE_CURSOR)),
SOUTH_WEST(newCursor(Cursor.SW_RESIZE_CURSOR)),
WEST(newCursor(Cursor.W_RESIZE_CURSOR)),
MOVE(newCursor(Cursor.MOVE_CURSOR)),
DEFAULT(newCursor(Cursor.DEFAULT_CURSOR));
privateCursorcs;
States(Cursorcs){
this.cs=cs;
}
publicCursorgetCursor(){
returncs;
}
}
希望本文所述对大家Java程序设计有所帮助。