java类似qq的截图

 

package screencapture;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import java.io.*;
import javax.imageio.*;
import java.awt.image.*;
/**
 * @author jacky.zhu java截图代码
 *  
 */
public class CaptureScreen extends JFrame implements ActionListener{
  private JButton start,cancel,save;
  private BufferedImage get;
  /** Creates a new instance of CaptureScreen */
  
  public CaptureScreen() {
      doStart();
  }

  private void doStart(){
    try{
      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();
      jf.getContentPane().add(new Temp(jf,bi,di.width,di.height));
      jf.setUndecorated(true);
      jf.setSize(di);
      jf.setVisible(true);
      jf.setAlwaysOnTop(true);
    }catch(Exception exe){
      exe.printStackTrace();
    }
  }

  private void doSave()throws NullPointerException{
    try{
      
          File file = new File("d:/123.jpg");//这里我写死了路径和类型jpg
      String about="jpg";
      String ext=file.toString().toLowerCase();
      System.out.println(ext);
      
      ImageIO.write(get,about,file);
    } catch(Exception exe){
      exe.printStackTrace();
    }
  }

  public void actionPerformed(ActionEvent ae){
    if(ae.getSource()==start){
      doStart();
    } else if(ae.getSource()==cancel){
      //System.exit(0);
    } else if(ae.getSource()==save){
      doSave();
    }
  }

//代码太长我把一部分 分开.下面继续

  public static void main(String args[]){
    new CaptureScreen();
  }
  
//一个暂时类，用于显示当前的屏幕图像
  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;//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
    
    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);
      Image icon=Toolkit.getDefaultToolkit().createImage(this.getClass().getResource("icon.png"));
      cs=Toolkit.getDefaultToolkit().createCustomCursor(icon,new Point(0,0),"icon");
      this.setCursor(cs);
      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);
    }

    public void mouseMoved(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){
        if(startX>endX){
          startX+=(x-tempX);
          tempX=x;
        } else{
          endX+=(x-tempX);
          tempX=x;
        }
      }else if(current==States.NORTH){
        if(startY<endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
      }else if(current==States.WEST){
        if(startX<endX){
          startX+=(x-tempX);
          tempX=x;
        } else{
          endX+=(x-tempX);
          tempX=x;
        }
      }else if(current==States.SOUTH){
        if(startY>endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
      } else if(current==States.NORTH_EAST){
        if(startX>endX){
          startX+=(x-tempX);
          tempX=x;
        } else{
          endX+=(x-tempX);
          tempX=x;
        }
        if(startY<endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
      }else if(current==States.NORTH_WEST){
        if(startX<endX){
          startX+=(x-tempX);
          tempX=x;
        } else{
          endX+=(x-tempX);
          tempX=x;
        }
        if(startY<endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
      }else if(current==States.SOUTH_EAST){
        if(startY>endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
        if(startX>endX){
          startX+=(x-tempX);
          tempX=x;
        } else{
          endX+=(x-tempX);
          tempX=x;
        }
      }else if(current==States.SOUTH_WEST){
        if(startY>endY){
          startY+=(y-tempY);
          tempY=y;
        }else{
          endY+=(y-tempY);
          tempY=y;
        }
        if(startX<endX){
          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){
      tempX=me.getX();
      tempY=me.getY();
    }

    public void mouseReleased(MouseEvent me){
         System.out.println("mouseReleased");
      if(me.isPopupTrigger()){
        if(current==States.MOVE){
          startX=0;
          startY=0;
          endX=0;
          endY=0;
          repaint();
        } else{
          jf.dispose();
          //doSave();
         
        }
      }
    }

    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();
            //save.setEnabled(true);
            doSave();
          }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();
            //save.setEnabled(true);
            doSave();
          }
        }
      }
    }

}

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;
  }
}
}

 

在类的目录下有个icon.png图片 

转自：http://topic.csdn.net/u/20090122/16/727ef794-3494-4bcb-80ac-d482912fb32d.html