投影仪电子化(E_Projector)

投影仪电子化(E_Projector)

问题的产生：软件公司组织内部培训，有时投影仪（资源）紧缺，培训时没有投影仪，在这种情况下每个人只能打开自己的电脑，边听边翻演讲者提供的PPT或者相关资料。这样可能会导致听众不能及时跟上演讲者的思路，以致培训失败。
需求：将投影仪电子化，大家的屏幕显示与演讲者一致。屏幕数20个左右。
设计：开发语言：java
        IDE:Eclipse
        开发思路：使用socket机制使得演讲者的机器和听众的机器进行通讯。 演讲者的机器作为服务端，听众的机器作为客户端，服务端每隔1秒截屏一次，客户端每个2秒去服务端取一次截屏图片数据并显示。
详细设计:

主程序mainapp.java:

 1  package  cn.com.lz.sharescreen;
 2  import  java.awt.EventQueue;
 3 
 4  import  javax.swing.JFrame;
 5  import  javax.swing.JButton;
 6  import  javax.swing.JSplitPane;
 7  import  javax.swing.JToolBar;
 8  import  javax.swing.JRadioButton;
 9  import  javax.swing.JTextField;
10  import  javax.swing.JLabel;
11  import  javax.swing.event.ChangeListener;
12  import  javax.swing.event.ChangeEvent;
13  import  javax.swing.JDesktopPane;
14  import  java.awt.event.ActionListener;
15  import  java.awt.event.ActionEvent;
16 
17 
18  public   class  mainapp {
19 
20       private  JFrame frmAgreecomm;
21       private  JTextField textField;
22 
23       /**
24       * Launch the application.
25        */
26       public   static   void  main(String[] args) {
27          EventQueue.invokeLater( new  Runnable() {
28               public   void  run() {
29                   try  {
30                      mainapp window  =   new  mainapp();
31                      window.frmAgreecomm.setVisible( true );
32                  }  catch  (Exception e) {
33                      e.printStackTrace();
34                  }
35              }
36          });
37      }
38 
39       /**
40       * Create the application.
41        */
42       public  mainapp() {
43          initialize();
44      }
45 
46       /**
47       * Initialize the contents of the frame.
48        */
49       private   void  initialize() {
50          frmAgreecomm  =   new  JFrame();
51          frmAgreecomm.setTitle( " AGREE_COMM " );
52          frmAgreecomm.setBounds( 100 ,  100 ,  561 ,  245 );
53          frmAgreecomm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
54          frmAgreecomm.getContentPane().setLayout( null );
55          
56          JButton btnRun  =   new  JButton( " \u672C\u673A\u5145\u5F53\u670D\u52A1\u7AEF\uFF0C\u5176\u4ED6\u673A\u5668\u53EF\u4EE5\u8FDE\u63A5\u81F3\u672C\u673A " );
57          btnRun.addActionListener( new  ActionListener() {
58               public   void  actionPerformed(ActionEvent e) {
59                  ServerScreen frame  =   new  ServerScreen();
60                  frame.setVisible( true );
61              }
62          });
63          btnRun.setBounds( 75 ,  45 ,  410 ,  23 );
64          frmAgreecomm.getContentPane().add(btnRun);
65          
66          textField  =   new  JTextField();
67          textField.setBounds( 150 ,  116 ,  124 ,  21 );
68          frmAgreecomm.getContentPane().add(textField);
69          textField.setColumns( 10 );
70          
71          JLabel lblServerip  =   new  JLabel( " ServerIP\uFF1A " );
72          lblServerip.setBounds( 75 ,  119 ,  65 ,  15 );
73          frmAgreecomm.getContentPane().add(lblServerip);
74          
75          JButton btnClose  =   new  JButton( " \u672C\u673A\u8FDE\u63A5\u81F3\u670D\u52A1\u7AEF " );
76          btnClose.addActionListener( new  ActionListener() {
77               public   void  actionPerformed(ActionEvent e) {
78                  ClientScreen frame  =   new  ClientScreen(textField.getText());
79      
80              }
81          });
82          btnClose.setBounds( 313 ,  115 ,  168 ,  23 );
83          frmAgreecomm.getContentPane().add(btnClose);
84      }
85  }
86 

抓图程序：

package  cn.com.lz.sharescreen;

import  java.awt.Container;
import  java.awt.Dimension;
import  java.awt.Graphics2D;
import  java.awt.Image;
import  java.awt.MediaTracker;
import  java.awt.Rectangle;
import  java.awt.RenderingHints;
import  java.awt.Robot;
import  java.awt.Toolkit;
import  java.awt.image.BufferedImage;
import  java.io.BufferedOutputStream;
import  java.io.File;
import  java.io.FileOutputStream;
import  javax.imageio.ImageIO;
import  com.sun.image.codec.jpeg.JPEGCodec;
import  com.sun.image.codec.jpeg.JPEGEncodeParam;
import  com.sun.image.codec.jpeg.JPEGImageEncoder;



public   class  CaptureScreen  implements  Runnable{
     public   static   void  main ( String [] args )  throws  InterruptedException{
     // 测试生成缩略图
    createThumbnail( " c:\\555.gif " ,  200 ,  200 ,  100 ,  " c:\\uuuu.jpg " );
     // 测试捕捉屏幕，每隔一秒捕获一次
    String path  =   " c:\\screen\\ " ;
     int  i  =   0 ;
     for  ( ;; )
    {
        i ++ ;
        String filepath  =  path  +  i  +   " .jpg " ;
        snatchScreen(filepath);
        Thread.currentThread().sleep( 2000 );
    }

}

/**
* 处理图片，改变起大小，可进行缩略和放大
*  @param  filename 源文件名称
*  @param  thumbWidth  处理后宽度
*  @param  thumbHeight 处理后高度
*  @param  quality     品质 最高100，最小0
*  @param  outFilename  输出文件名称
*/

     public   static   void  createThumbnail ( String filename,  int  thumbWidth,  int  thumbHeight,  int  quality, String outFilename )
    {
        Image image  =  Toolkit.getDefaultToolkit().getImage(filename);
        MediaTracker mediaTracker  =   new  MediaTracker( new  Container());
        mediaTracker.addImage(image,  0 );
         try
        {
            mediaTracker.waitForID( 0 );
             double  thumbRatio  =  ( double ) thumbWidth  /  ( double ) thumbHeight;
             int  imageWidth  =  image.getWidth( null );
             int  imageHeight  =  image.getHeight( null );
             double  imageRatio  =  ( double ) imageWidth  /  ( double ) imageHeight;
             if  ( thumbRatio  <  imageRatio )
            {
                thumbHeight  =  ( int ) ( thumbWidth  /  imageRatio );
            }
             else
            {
                thumbWidth  =  ( int ) ( thumbHeight  *  imageRatio );
            }
            BufferedImage thumbImage  =   new  BufferedImage(thumbWidth,
            thumbHeight, BufferedImage.TYPE_INT_RGB);
            Graphics2D graphics2D  =  thumbImage.createGraphics();
            graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            graphics2D.drawImage(image,  0 ,  0 , thumbWidth, thumbHeight,  null );
            BufferedOutputStream out  =   new  BufferedOutputStream( new  FileOutputStream(outFilename));
            JPEGImageEncoder encoder  =  JPEGCodec.createJPEGEncoder(out);
            JPEGEncodeParam param  =  encoder.getDefaultJPEGEncodeParam(thumbImage);
            quality  =  Math.max( 0 , Math.min(quality,  100 ));
            param.setQuality(( float ) quality  /   100.0f ,  false );
            encoder.setJPEGEncodeParam(param);
            encoder.encode(thumbImage);
            out.close();
        }
         catch  ( Exception e )
        {
            e.printStackTrace();
        }
    }
    
     /**
    * 抓取电脑屏幕
    *  @param  path
     */
     public   static   void  snatchScreen ( String path )
    {
        Robot robot;
         try
        {
            robot  =   new  Robot();
            Dimension d  =  Toolkit.getDefaultToolkit().getScreenSize();
            Rectangle rect  =   new  Rectangle( 0 ,  0 , d.width, d.height);
            BufferedImage image  =  robot.createScreenCapture(rect);
            ImageIO.write(image,  " jpg " ,  new  File(path));
        }
         catch  ( Exception e )
        {
            System.out.println( " Failed to snatch screen   " );
            e.printStackTrace();
        }
    
    }

    @Override
     public   void  run() {
        String path  =   " c:\\screen\\ " ;
        String filepath  =  path  +   " cs.jpg " ;
         while ( true ){
            snatchScreen(filepath);
            
             try  {
                Thread.currentThread().sleep( 2000 );
            }  catch  (InterruptedException e) {
                 //  TODO Auto-generated catch block
                e.printStackTrace();
            }
            
        }
        
    }

}

客户端程序：

package  cn.com.lz.sharescreen;

import  java.awt.BorderLayout;
import  java.awt.EventQueue;
import  java.awt.Graphics;
import  java.awt.Image;
import  java.awt.Toolkit;

import  javax.imageio.stream.MemoryCacheImageInputStream;
import  javax.imageio.stream.MemoryCacheImageOutputStream;
import  javax.swing.ImageIcon;
import  javax.swing.JFrame;
import  javax.swing.JPanel;
import  javax.swing.border.EmptyBorder;
import  javax.swing.JMenuBar;
import  javax.swing.border.LineBorder;
import  java.awt.Color;
import  java.io.DataInputStream;
import  java.io.DataOutputStream;
import  java.io.File;
import  java.io.FileInputStream;
import  java.io.FileOutputStream;
import  java.io.IOException;
import  java.io.ObjectInputStream;
import  java.io.ObjectOutputStream;
import  java.io.OutputStream;
import  java.net.Socket;
import  java.net.UnknownHostException;
import  javax.swing.JButton;



public   class  ClientScreen  extends  JFrame  implements  Runnable{
     private   String IP;
    Image ima = Toolkit.getDefaultToolkit().getImage( " C:\\360buy1.jpg " );  

     // ImageIcon ima = new ImageIcon("C:\\360buy1.jpg");
     public  ClientScreen(String IP) {
        setTitle( " \u5BA2\u6237\u7AEF " );
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds( 100 ,  100 ,  668 ,  433 );
         this .IP = IP;
         this .setVisible( true );
        
         new  Thread( this ).start();
    }
     public   void  paint(Graphics g){
         super .paint(g);
        g.drawLine( 10 ,  10 ,  100 ,  100 );
        
        g.drawImage(ima,  0 ,  0 ,  this );
    }
     public   void  run(){
         while ( true ){
             try  {
                Thread.sleep( 2000 );
                 
            }  catch  (InterruptedException e) {
                 //  TODO Auto-generated catch block
                e.printStackTrace();
            }
            MyClient mc = new  MyClient();
            mc.start();
             // System.out.print(111111111);
            repaint();
        }
            
    }
     public   class  MyClient  extends  Thread{   
        Socket socket  =   null ;   
         public   void  run(){
             try  {
                socket  =   new  Socket(IP,  1111 );            
                DataOutputStream doc  =   new  DataOutputStream(socket.getOutputStream());   
                ObjectInputStream in  =   new  ObjectInputStream(socket.getInputStream());   
                doc.writeUTF( " list11111 " ); 
                doc.flush();
                 long  len  =  in.readLong();
                System.out.print(len);
                FileInputStream fis =   new  FileInputStream((File)in.readObject());
                 byte [] b = new   byte [( int ) len];
                fis.read(b);
                ima = Toolkit.getDefaultToolkit().createImage(b);
                fis.close();
                doc.close();
                in.close();
                doc.close();   
                in.close();   
                socket.close();   
            }  catch  (UnknownHostException e) {
                e.printStackTrace();
            }  catch  (IOException e) {
                e.printStackTrace();
            }  catch  (ClassNotFoundException e) {
                 //  TODO Auto-generated catch block
                e.printStackTrace();
            }  finally  {
                
            }   
        }
    } 
}

服务端程序：

package  cn.com.lz.sharescreen;

import  java.awt.BorderLayout;
import  java.awt.EventQueue;
import  java.awt.Image;
import  java.awt.Toolkit;
import  java.io.BufferedInputStream;
import  java.io.DataInputStream;
import  java.io.DataOutputStream;
import  java.io.File;
import  java.io.FileInputStream;
import  java.io.IOException;
import  java.io.ObjectOutputStream;
import  java.net.ServerSocket;
import  java.net.Socket;

import  javax.swing.JFrame;
import  javax.swing.JPanel;
import  javax.swing.border.EmptyBorder;
import  javax.swing.JEditorPane;


public   class  ServerScreen  extends  JFrame {

     private  JPanel contentPane;
     public  JEditorPane editorPane;

     public  ServerScreen() {
        setTitle( " Server " );
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds( 100 ,  100 ,  399 ,  446 );
        contentPane  =   new  JPanel();
        contentPane.setBorder( new  EmptyBorder( 5 ,  5 ,  5 ,  5 ));
        contentPane.setLayout( new  BorderLayout( 0 ,  0 ));
        setContentPane(contentPane);
        
        editorPane  =   new  JEditorPane();
        contentPane.add(editorPane, BorderLayout.CENTER);
        MyServer myserver = new  MyServer(); 
        myserver.start();
         new  Thread( new  CaptureScreen()).start();
    }
     public   class  MyServer  extends  Thread {
         public  MyServer(){
             super ();
            editorPane.setText( " Welcome to use Agree_Comm " + " \n " );
        }
         public   void  run(){
            doListen();
            
        }
         public   void  doListen() {   
            ServerSocket server;   
             try  {   
                server  =   new  ServerSocket( 1111 );   
                 while  ( true ) {   
                    Socket client  =  server.accept();   
                     new  Thread( new  SSocket(client)).start();   
                }   
            }  catch  (IOException e) {   
                e.printStackTrace();   
            }   
        }   
      
         // 服务器进程   
         class  SSocket  implements  Runnable {   
      
            Socket client;   
      
             public  SSocket(Socket client) {   
                 this .client  =  client;   
            }   
      
             public   void  run() {   
                DataInputStream input;   
                ObjectOutputStream output; 

                 try  {   
                    File img = new  File( " C:\\screen\\cs.jpg " );
                    
                    input  =   new  DataInputStream(client.getInputStream());   
                    output  =   new  ObjectOutputStream(client.getOutputStream());   
                     //    
                    String listMsg  =  input.readUTF();  
                    Toolkit t = getToolkit();
         
                     long  fis_len = img.length();
                    System.out.print( " fis_len: " + fis_len);
                    output.writeLong(fis_len);
                    output.flush();
                    
                    editorPane.setText(editorPane.getText() + " \n " + " Recive:    "   +  listMsg);
                     // System.out.println("Recive:   " + listMsg);   
                     // listMsg = input.readUTF();   
                     // output.writeUTF("Recive Second:  " + listMsg + "    \r\n Thx");  
                     // editorPane.setText(editorPane.getText()+"\n"+"Recive:   " + listMsg);
                     // System.out.println("Recive Second:   " + listMsg); 
                    
                    output.writeObject(img);
                    output.flush();
                    input.close();
                    output.close();
                    client.close();
                }  catch  (IOException e) {   
                    e.printStackTrace();   
                } 
                 finally {
                    
                    
                }

            }   
        }   


    }
}

聚沙成洲，奋发超越。