java实现屏幕共享功能实例分析

package Test;
 
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
 
import javax.imageio.ImageIO;
 
/*
 * ly  2014-11-20
 * 该类实时发送截屏消失，多线程实现，不包含鼠标信息，且没有做对每个Client做优化处理
 */
public  class SendScreenImg extends Thread
{
    public static int SERVERPORT=8000;
    private ServerSocket serverSocket;
    private Robot robot;
    public  Dimension screen;
    public Rectangle rect ;
    private Socket socket;
    
    public static void main(String args[])
    {
        new SendScreenImg(SERVERPORT).start();
    }
    
    //构造方法  开启套接字连接      机器人robot   获取屏幕大小
    public SendScreenImg(int SERVERPORT)
    {
        try {
            serverSocket = new ServerSocket(SERVERPORT);
            serverSocket.setSoTimeout(864000000);
            robot = new Robot();
        } catch (Exception e) {
            e.printStackTrace();
        }
        screen = Toolkit.getDefaultToolkit().getScreenSize();  //获取主屏幕的大小
        rect = new Rectangle(screen);                          //构造屏幕大小的矩形
    }
    
    @Override
    public void run()
    {
        //实时等待接收截屏消息
        while(true)
        {
            try{
                socket = serverSocket.accept();
                System.out.println("学生端口已经连接");
                ZipOutputStream zip = new ZipOutputStream(new DataOutputStream(socket.getOutputStream()));
                zip.setLevel(9);     //设置压缩级别
                
                BufferedImage img = robot.createScreenCapture(rect);
                zip.putNextEntry(new ZipEntry("test.jpg"));
                ImageIO.write(img, "jpg", zip);
                if(zip!=null)zip.close();
                System.out.println("Client正在实时连接");
               
            } catch (IOException ioe) {
                System.out.println("连接断开");
            } finally {
                if (socket != null) {
                    try {
                        socket.close();
                    } catch (IOException e) {e.printStackTrace();}
                }
            }
        }
    }
}

package Test;
import java.awt.Frame;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.concurrent.TimeUnit;
import java.util.zip.ZipInputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
/*
 * ly  2014-11-20
 * 该类用于接收教师端的屏幕信息，不包括鼠标，待优化
 */
public  class ReceiveImages extends  Thread{
    public BorderInit frame ;
    public Socket socket;
    public String IP;
    
    public static void main(String[] args){
        new ReceiveImages(new BorderInit(), "127.0.0.1").start();
    }
    public ReceiveImages(BorderInit frame,String IP)
    {
        this.frame = frame;
        this.IP=IP;
    }
    
    public void run() {
        while(frame.getFlag()){
            try {
                socket = new Socket(IP,8000);
                DataInputStream ImgInput = new DataInputStream(socket.getInputStream());
                ZipInputStream imgZip = new ZipInputStream(ImgInput);
                
                imgZip.getNextEntry();             //到Zip文件流的开始处
                Image img = ImageIO.read(imgZip);  //按照字节读取Zip图片流里面的图片
                frame.jlbImg.setIcon(new ImageIcon(img));
                System.out.println("连接第"+(System.currentTimeMillis()/1000)%24%60+"秒");
                frame.validate();
                TimeUnit.MILLISECONDS.sleep(50);// 接收图片间隔时间
                imgZip.close();
                
            } catch (IOException | InterruptedException e) {
                System.out.println("连接断开");
            }finally{
                try {
                    socket.close();
                } catch (IOException e) {} 
            }      
        }  
    }
}
 
//Client端窗口辅助类，专门用来显示从教师端收到的屏幕信息
class BorderInit extends JFrame
{
    private static final long serialVersionUID = 1L;
    public JLabel jlbImg;
    private boolean flag;
    public boolean getFlag(){
        return this.flag;
    }
    public BorderInit()
    {
        this.flag=true;
        this.jlbImg = new JLabel();
        this.setTitle("远程监控--IP:"  + "--主题:" );
        this.setSize(400, 400);
        //this.setUndecorated(true);  //全屏显示，测试时最好注释掉
        //this.setAlwaysOnTop(true);  //显示窗口始终在最前面
        this.add(jlbImg);
        this.setLocationRelativeTo(null);
        this.setExtendedState(Frame.MAXIMIZED_BOTH);
        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        this.setVisible(true);
        this.validate();
    
        //窗口关闭事件
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                flag=false;
                BorderInit.this.dispose();
                System.out.println("窗体关闭");
                System.gc();    //垃圾回收
            }
        });
    }
}