package TCPSpy;  import   com.sun.image.codec.jpeg.*;     import   java.io.*;        import   java.awt.image.*;     import   java.net.*;     import   java.awt.*;     import   javax.swing.*;         class   MyFrame   extends   JFrame   {        private   MyPanel   panel   =   null;    public   MyFrame()   {     panel   =   new   MyPanel();     add(panel);     }         public   void   drawScr(BufferedImage   bi)   {     panel.draw(bi);     }         private    class   MyPanel   extends   JPanel   {        private   BufferedImage   bi   =   null;      @Override  protected   void   paintComponent(Graphics   g)   {     super.paintComponent(g);     g.drawImage(bi,   0,   0,   null);     }         public   void   draw(BufferedImage   bi)   {     this.bi   =   bi;     this.updateUI();     }     }     }         public   class   SpyClient   extends   Thread   {         private   InetAddress   ip   =   null;     private   Socket   s   =   null;     private   InputStream   is   =   null;     private   MyFrame   frame   =   null;     public   SpyClient(String address, int port)   {     try   {        ip   =   InetAddress.getByName(address);      s   =   new   Socket(ip, port);        is   =   s.getInputStream();     }     catch   (Exception   ex)  {      ex.printStackTrace();         System.err.println("public   Client.");    }     }           @Override  public   void   run() {     frame   =   new   MyFrame();     frame.setSize(800,600);  frame.setVisible(true);     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     try {     JPEGImageDecoder  decoder ;  while(true)  {  decoder   =   JPEGCodec.createJPEGDecoder(is);   Dimension d=Toolkit.getDefaultToolkit().getScreenSize();  BufferedImage resize=new BufferedImage((int) d.getWidth(),(int) d.getHeight(),BufferedImage.TYPE_INT_RGB);  BufferedImage   bi   =   decoder.decodeAsBufferedImage();   resize.getGraphics().drawImage(bi, 0, 0,(int) d.getWidth(),(int) d.getHeight(), null);  if   (resize   !=   null) {     frame.drawScr(resize);      }   Thread.sleep(20);  }   }     catch   (Exception   ex) {     ex.printStackTrace();    }   }      public   static   void   main(String[]   args)   throws   Exception   {     new   SpyClient("192.168.3.121",2222).start();     }       }