例12-12.txt

java电子版源码 java电子版源码

（1）服务器端
import java.io.*;
import java.net.*;
import java.util.*;
public class Server 
{  
   public static void main(String args[])
   {  
      ServerSocket server=null;
      Server_thread thread;
      Socket you=null;
      while(true) 
       {  
          try{  
                server=new ServerSocket(4331);
             }
          catch(IOException e1) 
             {  
                System.out.println("正在监听"); 
             } 
          try{  
                you=server.accept();
             }
         catch (IOException e)
             { 
             }
         if(you!=null) 
             {  
                new Server_thread(you).start();  
             }
         else 
             {  
                continue;
             }
      }
   }
}
class Server_thread extends Thread
{  
    Socket socket;
    DataOutputStream out=null;
    DataInputStream  in=null;
    String s=null;
    Server_thread(Socket t)
   { 
      socket=t;
      try {  
             in=new DataInputStream(socket.getInputStream());
             out=new DataOutputStream(socket.getOutputStream());
          }
      catch (IOException e)
          {}
   }  
   public void run()        
   {  
      while(true)
      {  
         double a[]=new double[3] ;int i=0;
         try{ 
               s=in.readUTF();
               StringTokenizer fenxi=new StringTokenizer(s," ,");
               while(fenxi.hasMoreTokens())
                   {  
                      String temp=fenxi.nextToken();
                      try{  
                            a[i]=Double.parseDouble(temp);
                            i++;
                         }
                      catch(NumberFormatException e)
                         {  
                             out.writeUTF("请输入数字字符");
                             break;
                         }
                       catch(ArrayIndexOutOfBoundsException e)
                         {
                             out.writeUTF("您多输入的数字无效");
                         }
                   }
                double p=(a[0]+a[1]+a[2])/2.0;
                out.writeUTF("面积:"+Math.sqrt(p*(p-a[0])*(p-a[1])*(p-a[2])));
                sleep(2);    
            }
         catch(InterruptedException e){}
         catch (IOException e) 
            {  
                System.out.println("客户离开");
                break;
            }
      }
   } 
    }
（2） 客户端
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Boy extends Applet implements Runnable,ActionListener
{  
   Button computer;
   TextField inputABC;
   TextArea  showResult;
   Socket socket=null;
   DataInputStream in=null;
   DataOutputStream out=null;
   Thread thread; 
   public void init()
   {  
      setBackground(Color.cyan);
      setLayout(new BorderLayout());
      Panel p1=new Panel(),
            p2=new Panel();
      p1.setLayout(new GridLayout(3,1)); 
      computer=new Button("提交到服务器");
      inputABC=new TextField(12);
      showResult=new TextArea(8,16);
      p1.add(new Label("输入三角形三边的长度,用逗号或空格分隔:"));
      p1.add(inputABC);
      p1.add(computer);
      p2.add(new Label("计算结果："));
      p2.add(showResult);
      computer.addActionListener(this);
      add(p1,BorderLayout.NORTH);
      add(p2,BorderLayout.CENTER);
   }
   public void start()
   {  
       try
         { 
            socket=new Socket(this.getCodeBase().getHost(), 4331); 
            in=new DataInputStream(socket.getInputStream());
            out=new DataOutputStream(socket.getOutputStream());
         } 
      catch (IOException e){}
      if(thread==null)
        {  
           thread = new Thread(this);
           thread.start();
        }
   }
   public void run()
   {  
      String s=null;
      while(true)
       {    try{  
                 s=in.readUTF();
                 showResult.append("\n"+s);
               }
           catch(IOException e) 
               {  
                  showResult.append("\n\n与服务器已断开");
                  break;
               }   
       }
  }
  public void actionPerformed(ActionEvent e)
  {  
      if(e.getSource()==computer)
      {  
         String s=inputABC.getText();
         if(s.length()>0)
           { 
                try 
                   { 
                    out.writeUTF(s);
                   }
                catch(IOException e1){} 
           }  
     }
  }
}