jwebcamplayer.java

这是我编译好的http-java-applet小程序,可以在linux下运行,方便使用.如在浏览器上看摄像头图象

/*
 * JWebcamPlayer.java
 *
 * Created on March 21, 2005, 1:31 AM
 */

/**
 *
 * @author Alvaro Salmador (nx5) (naplam33 at msn.com)
 */


import java.applet.*;
import java.applet.AppletContext.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.Image;
import java.net.URL;
import javax.swing.*;
//import javax.swing.table.*;
import javax.imageio.*;
//import java.util.*;
import java.io.*;
import java.net.*;
//import JWebcamPlayer.;
//import SwingWorker.;


public class JWebcamPlayer extends javax.swing.JApplet implements MouseListener, MouseMotionListener
{
    public static final boolean DEBUGGING = false;
   
    public JWebcamPlayer() 
    {
    }

    public static String checkAppletLoaded()
    {
        return "ok";
    }
    public static int unsignedByteToInt( byte b )
    {
    	return (int) b & 0xff;
    }
    public void init() 
    {
        m_strColor = getParameter("Color");
        if (m_strColor==null || m_strColor=="") m_strColor = "#FFFFFF";

        m_strServer = getCodeBase().getHost();//getParameter("Server");
        if (m_strServer==null || m_strServer=="") m_strServer = "127.0.0.1";

        m_strPort = getParameter("Port");
        if (m_strPort==null || m_strPort=="") m_strPort = "7070";
				
				overlay = toBufferedImage(getImage(getDocumentBase(), "control.jpg" ));
				do_overlay = false;
									
				addMouseListener(this);
				addMouseMotionListener(this);

    }
   
    public void createGUI()
    {
        setBackground(Color.decode(m_strColor));
        
        try {
            //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //native
            UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); //java
        } catch(Exception e) {  }
 
        Container content = getContentPane();
        
        content.setBackground(Color.decode(m_strColor));
        
        GridBagLayout gbl = new GridBagLayout();
        content.setLayout(gbl);

        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.BOTH;
        c.weighty = 1.0;
        c.weightx = 1.0;
        c.gridwidth = 1;
        c.anchor = GridBagConstraints.NORTHWEST;
        c.insets = new Insets(0, 0,0,0);
        c.gridheight = 1;
        c.gridx = 0;
        c.gridy = 0;

        m_label = new JLabel();
				m_label.setHorizontalAlignment(SwingConstants.LEFT);
				m_label.setVerticalAlignment(SwingConstants.TOP);

        m_label.setText("JWebcamPlayer Applet");
    
        content.add(m_label, c);
    }

    public void start()
    {
        m_stop = false;
        
        try {
            javax.swing.SwingUtilities.invokeAndWait(new Runnable() 
            {
                public void run() {
                    createGUI();
                }
            } );
        } catch (Exception e) { 
        }
 private SwingWorker m_worker = null;
  
     m_work=new SwingWork() {
         public Object construct() {
                
               Socket connection;
                InputStream in;
                OutputStream out;
                try {
                  int port = 0;
                  try {
                    port = Integer.parseInt(m_strPort);
                  }
                  catch(Exception e) {
                    port = 0;
                  }
                  if (port==0) port = 7070;
                  connection = new Socket(m_strServer, port);
                  in = connection.getInputStream();
                  out = connection.getOutputStream();
                }
                catch (IOException e) {
                  System.out.println(
                      "Attempt to create connection failed with error: " + e);
                  m_label.setIcon(null);
                  m_label.setText("JWebcamPlayer - Connection failed");
                  m_stop = true;
                  return null;
                }
                
                byte [] buffer = new byte [512*1024];
                
                m_label.setText("");
        
                while(!m_stop)
                {
                    // bucle, constantemente lee imagen del server y la muestra
                    byte [] b = {'O','K',0,0, 0,0,0,0,0,0,0,0,0};
                    
										if(bright_up) {
											b[7] = 1;
											bright_up = false;
										}
										if(bright_down) {
											b[7] = 2;
											bright_down = false;
										}
										if(contrast_up) {
											b[8] = 1;
											contrast_up = false;
										}
										if(contrast_down) {
											b[8] = 2;
											contrast_down = false;
										}
                    
                    int n = 0;
                    int siz = 0;

                    try {
                        out.write(b);

                        if (DEBUGGING)
                            System.out.print("-sending my header ("+Integer.toString(b.length)+") bytes");
                        
                        n = in.read(buffer, 0, HDRLEN);
                        /*while(n<HDRLEN && n>0) {
                            int r = in.read(buffer, n, HDRLEN-n);
                            if (r<=0) break;
                        }*/
                        
                        if (DEBUGGING)
                            System.out.print("-read header ("+Integer.toString(n)+") bytes");
                    }
                    catch(Exception e) {
                        if (DEBUGGING)
                            e.printStackTrace();
                        
                        m_stop = true;
                    }
                    
                    if (n<HDRLEN) 
                    {
                        if (n<=0) 
                            m_stop = true;

                        continue;
                    } 
                    else 
                    {
                        // can someone point out a more straightforward way to convert 4 bytes
                        // to a java integer? this is just awful...
                        int ssz = SZOFS;
												siz += unsignedByteToInt(buffer[ssz+3]) << 24;
												siz += unsignedByteToInt(buffer[ssz+2]) << 16;
												siz += unsignedByteToInt(buffer[ssz+1]) << 8;
												siz += unsignedByteToInt(buffer[ssz]) ;
                        if (DEBUGGING)
                            System.out.println("** reading jpeg, size="+Integer.toString(siz));

                        n = HDRLEN;
                        if (buffer[0]!='S' || buffer[1]!='P' || buffer[2]!='C' || buffer[3]!='A')
                        {
                            if (DEBUGGING)
                                System.out.println("*Header missing 'SPCA'");
                            
                            continue;
                        }
                        else if (siz<=0 || siz>(512*1024))
                        {
                            siz = 0;
                            try { 
                                in.read(buffer, n, buffer.length); 
                            }   
                            catch(Exception e) {
                                if (DEBUGGING)
                                    e.printStackTrace();
                            }
                            
                            if (DEBUGGING)
                                System.out.println("*Illegal image size");
                            
                            continue;
                        }
                        else 
                        {
                            do
                            {
                                int r = 0;