Java实现屏幕截图工具的代码怎么写

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效果展示

程序运行后的截图：

先测试一下功能：

截图过程对界面的捕捉：

双击保存后的显示界面：

后续的步骤就自己去尝试吧，这里给出了简单的测试过程。

程序结构

核心代码

CaptureScreen.java类

/**  * CaptureScreen.java  */ 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;     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");         try{             UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());         }catch(Exception exe){             exe.printStackTrace();         }         initWindow();         initOther();     }     private void initOther(){         jtp=new JTabbedPane(JTabbedPane.TOP,JTabbedPane.SCROLL_TAB_LAYOUT);     }     private void initWindow(){         start=new JButton("开始截取");         cancel=new JButton("退出");         start.addActionListener(this);         cancel.addActionListener(this);         JPanel buttonJP=new JPanel();         c=new JPanel(new BorderLayout());         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(cancel);         buttonJP.setBorder(BorderFactory.createTitledBorder("公共操作区"));         JPanel jp=new JPanel();//放置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.EXIT_ON_CLOSE);     }          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); // 调整LookAndFeel（javax.swing）         }     }          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(); // （通过本地操作）控制鼠标、键盘等实际输入源（java.awt）             Toolkit tk=Toolkit.getDefaultToolkit(); // AWT组件的抽象父类（java.awt）             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); // 自定义的Temp类的对象             jf.getContentPane().add(temp,BorderLayout.CENTER);             jf.setUndecorated(true);             jf.setSize(di);             jf.setVisible(true);             jf.setAlwaysOnTop(true);         } catch(Exception exe){             exe.printStackTrace();         }     }          /**     *公用的处理保存图片的方法     */     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){                     if(!ext.endsWith(".jpg")){                         String ns=ext+".jpg";                         file=new File(ns);                         about="JPG";                     }                 } else if(ff instanceof PNGfilter){                     if(!ext.endsWith(".png")){                         String ns=ext+".png";                         file=new File(ns);                         about="PNG";                     }                 }else if(ff instanceof BMPfilter){                     if(!ext.endsWith(".bmp")){                         String ns=ext+".bmp";                         file=new File(ns);                         about="BMP";                     }                 }else if(ff instanceof GIFfilter){                     if(!ext.endsWith(".gif")){                         String ns=ext+".gif";                         file=new File(ns);                         about="GIF";                     }                 }                 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;             } // java.awt.datatransfer（接口）             Transferable trans = new Transferable(){ // 内部类                 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){ // 金属外观             try{                 UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());                 SwingUtilities.updateComponentTreeUI(this);             }catch(Exception exe){                 exe.printStackTrace();             }         }else if(source==system){ // 本地外观             try{                 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());                 SwingUtilities.updateComponentTreeUI(this);             }catch(Exception exe){                 exe.printStackTrace();             }         }     }          //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();         }         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)";         }     }          //一个临时类，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（十字线）         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,则提示就不再显示了                  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); // current：当前状态（state）             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区域         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();             // 分别处理一系列的（光标）状态（枚举值）             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()){ // 右键                 if(current==States.MOVE){                     showTip=true;                     p=me.getPoint();                     startX=0;                     startY=0;                     endX=0;                     endY=0;                     repaint();                 } else{ // 普通情况                     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;     } }

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