Screenshot

Java截屏

package com.screenshot;

import java.awt.AWTException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.filechooser.FileSystemView;

public class SnapshotTest { 
    public static void main(String[] args) { 
        // 全屏运行        
    	RectD rd = new RectD(); 
        GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice(); 
        gd.setFullScreenWindow(rd); 
    } 
} 
 class RectD extends JFrame { 
    private static final long serialVersionUID = 1L; 
    int orgx, orgy, endx, endy; 
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); 
    BufferedImage image; 
    BufferedImage tempImage; 
    BufferedImage saveImage; 
    Graphics g; 
  
    @Override
    public void paint(Graphics g) { 
        RescaleOp ro = new RescaleOp(0.8f, 0, null); 
        tempImage = ro.filter(image, null); 
        g.drawImage(tempImage, 0, 0, this); 
    } 
  
    public RectD() { 
        snapshot(); 
        setVisible(true); 
        // setSize(d);//最大化窗口        
        setDefaultCloseOperation(EXIT_ON_CLOSE); 
        this.addMouseListener(new MouseAdapter() { 
            public void mousePressed(MouseEvent e) { 
                orgx = e.getX(); 
                orgy = e.getY(); 
            } 
        }); 
        this.addMouseMotionListener(new MouseMotionAdapter() { 
            public void mouseDragged(MouseEvent e) { 
                endx = e.getX(); 
                endy = e.getY(); 
                g = getGraphics(); 
                g.drawImage(tempImage, 0, 0, RectD.this); 
                int x = Math.min(orgx, endx); 
                int y = Math.min(orgy, endy); 
                int width = Math.abs(endx - orgx)+1; 
                int height = Math.abs(endy - orgy)+1; 
                // 加上1，防止width或height为0                 
                g.setColor(Color.BLUE); 
                g.drawRect(x-1, y-1, width+1, height+1); 
                //减1，加1都是为了防止图片将矩形框覆盖掉                 
                saveImage = image.getSubimage(x, y, width, height); 
                g.drawImage(saveImage, x, y, RectD.this); 
            } 
        }); 
        this.addKeyListener(new KeyAdapter() { 
            @Override
            public void keyReleased(KeyEvent e) { 
                // 按Esc键退出                
            	if (e.getKeyCode() == 27) { 
                    saveToFile(); 
                    System.exit(0); 
                } 
            } 
        }); 
    } 
  
    public void saveToFile() { 
        SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss"); 
        String name = sdf.format(new Date()); 
        File path = FileSystemView.getFileSystemView().getHomeDirectory(); 
        String format = "jpg"; 
        String finalPath = path + File.separator + name + "." + format;
        System.out.println(finalPath);
        File f = new File(finalPath); 
        try { 
            ImageIO.write(saveImage, format, f); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
  
    public void snapshot() { 
        try { 
            Robot robot = new Robot(); 
            Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); 
            image = robot.createScreenCapture(new Rectangle(0, 0, d.width, 
                    d.height)); 
        } catch (AWTException e) { 
            e.printStackTrace(); 
        } 
    } 
}

Servlet里返回图像到Response

package com;

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ScreenServlet
 */
public class ScreenServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		try {
			BufferedImage image = null;
			Robot robot = new Robot();
			Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
			image = robot.createScreenCapture(new Rectangle(0, 0, d.width, d.height));

			String format = "jpg";
			ImageIO.write(image, format, response.getOutputStream());
			
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}