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

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        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();        }    }            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();        }    }            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;    }}

感谢各位的阅读，以上就是“Java实现屏幕截图工具的代码怎么写”的内容了，经过本文的学习后，相信大家对Java实现屏幕截图工具的代码怎么写这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！