例11-7.txt

这是一本java基础教程 对新手上路有很大帮助

主机1：
import java.net.*;
import java.awt.*; 
import java.awt.event.*;
import javax.swing.*;
public class A extends JFrame implements Runnable,ActionListener{
    JTextField outMessage=new JTextField(12);
    JTextArea inMessage=new JTextArea(12,20); 
    JButton b=new JButton("发送数据");
    A(){
       super("I AM A");
       setSize(320,200);
       setVisible(true);
       JPanel p=new JPanel();
       b.addActionListener(this);
       p.add(outMessage);
       p.add(b);
       Container con=getContentPane();
       con.add(new JScrollPane(inMessage),BorderLayout.CENTER);
       con.add(p,BorderLayout.NORTH);
       Thread thread=new Thread(this);
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       validate(); 
       thread.start();                                //线程负责接收数据
    }
    public void actionPerformed(ActionEvent event){     //单击按钮发送数据
       byte b[]=outMessage.getText().trim().getBytes();
       try{   InetAddress address=InetAddress.getByName("127.0.0.1");
             DatagramPacket data=new DatagramPacket(b,b.length,address,1234);
             DatagramSocket mail=new DatagramSocket();
             mail.send(data);
       }
       catch(Exception e){}     
    }
    public void run(){                                //接收数据
       DatagramPacket pack=null;
       DatagramSocket mail=null;
       byte b[]=new byte[8192];
       try{   pack=new DatagramPacket(b,b.length);
             mail=new DatagramSocket(5678);
       }
       catch(Exception e){} 
       while(true){
            try{  mail.receive(pack); 
                 String message=new String(pack.getData(),0,pack.getLength());
                 inMessage.append("收到数据来自："+pack.getAddress());
                 inMessage.append("\n收到数据是："+message+"\n");
                 inMessage.setCaretPosition(inMessage.getText().length());
            }
            catch(Exception e){}
       } 
    }
    public static void main(String args[]){
       new A();
    }
}  
主机2：
import java.net.*;
import java.awt.*; 
import java.awt.event.*;
import javax.swing.*;
public class B extends JFrame implements Runnable,ActionListener{
    JTextField outMessage=new JTextField(12);
    JTextArea inMessage=new JTextArea(12,20); 
    JButton b=new JButton("发送数据");
    B(){
       super("I AM B");
       setBounds(350,100,320,200);
       setVisible(true);
       JPanel p=new JPanel();
       b.addActionListener(this);
       p.add(outMessage);
       p.add(b);
       Container con=getContentPane();
       con.add(new JScrollPane(inMessage),BorderLayout.CENTER);
       con.add(p,BorderLayout.NORTH);
       Thread thread=new Thread(this);
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       validate(); 
       thread.start();                                //线程负责接收数据
    }
    public void actionPerformed(ActionEvent event){     //单击按钮发送数据
       byte b[]=outMessage.getText().trim().getBytes();
       try{   InetAddress address=InetAddress.getByName("127.0.0.1");
             DatagramPacket data=new DatagramPacket(b,b.length,address,5678);
             DatagramSocket mail=new DatagramSocket();
             mail.send(data);
       }
       catch(Exception e){}     
    }
  public void run(){                                //接收数据
       DatagramPacket pack=null;
       DatagramSocket mail=null;
       byte b[]=new byte[8192];
       try{   pack=new DatagramPacket(b,b.length);
             mail=new DatagramSocket(1234);
       }
       catch(Exception e){} 
       while(true){
           try{   mail.receive(pack); 
                 String message=new String(pack.getData(),0,pack.getLength());
                 inMessage.append("收到数据来自："+pack.getAddress());
                 inMessage.append("\n收到数据是："+message+"\n");
                 inMessage.setCaretPosition(inMessage.getText().length());
           }
           catch(Exception e){}
       }
    }
    public static void main(String args[]){
       new B();
    }
}