初学者，一个简单的C/S聊天程序

Question

不知道怎么才能实现广域网

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.lang.*;
public class CClientu extends JFrame implements ActionListener,Runnable
{
    TextField tf;
    TextArea ta;
    Socket s;
    DataInputStream dis;
    DataOutputStream dos;
    Thread t;

           CClientu()
            {
                 tf=new TextField();
   tf.setEditable(false);
   tf.addActionListener(this);
   ta=new TextArea();
   t=new Thread(this);
   getContentPane().add(tf,BorderLayout.NORTH);
                 getContentPane().add(ta,BorderLayout.CENTER);
   setSize(220,150);
   setLocation(500,0);
   setTitle("Client");
                 validate();
   setVisible(true);
   setDefaultCloseOperation(EXIT_ON_CLOSE);
   try{
                        s=new Socket("127.0.0.1",2008);
          dos=new DataOutputStream(s.getOutputStream());
   dis=new DataInputStream(s.getInputStream());
   tf.setEditable(true);
   t.start();
    }catch(Exception ex){System.out.println("Setup connect failed...");}
            }           public void actionPerformed(ActionEvent e)
            {
                       if(!tf.getText().equals(""))
                   {
                      try{
          dos.writeUTF("Client:"+tf.getText()+'\n');
  ta.appendText("Client:"+tf.getText()+'\n');
          tf.setText("");                      
                       }catch(Exception e4){System.out.println("Send data failed...");}
                     }             
            }           public void run()
            {
                  do{
                         try{   
    if(dis.available()!=0) ta.appendText(dis.readUTF());
    Thread.sleep(200);
    }catch(Exception e3){System.out.println("Receive data failed...");}
                   } while(true);
            }           public static void main(String args[])
            {   new CClientu();   }}

Answer 2

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.lang.*;
public class CServeru extends JFrame implements ActionListener,Runnable
      {
           TextField tf;
           TextArea ta;
           Container con;    
           ServerSocket waitSocketConnection;
    Socket client;
    DataInputStream dis;
    DataOutputStream dos;
    Thread rcv;
   
            CServeru()
            {
                tf=new TextField();
  tf.setEditable(false);
                ta=new TextArea();
  rcv=new Thread(this);
                tf.addActionListener(this);
  con=getContentPane();
                con.add(tf,BorderLayout.NORTH);
                con.add(ta,BorderLayout.CENTER);
                setTitle("Server");
                setSize(220,150);
                validate();
                setVisible(true);
  setDefaultCloseOperation(EXIT_ON_CLOSE);
   try{
                       waitSocketConnection=new ServerSocket(2008);
  }catch(IOException e2){System.out.println("Setup ServerSocket error...");}
  try{
                       client=waitSocketConnection.accept();
  dis=new DataInputStream(client.getInputStream());
  dos=new DataOutputStream(client.getOutputStream());
  tf.setEditable(true);
  rcv.start();
  }catch(Exception e1){System.out.println("Setup I/O failed...");}
            }
            
         public void actionPerformed(ActionEvent e)
         {
             if(!tf.getText().equals(""))
            {
               try{
  dos.writeUTF("Server:"+tf.getText()+'\n');
  ta.appendText("Server:"+tf.getText()+'\n');
  tf.setText("");                }catch(Exception e4){System.out.println("Send data failed...");}
              }
         }         public void run()
          {    
                    do{
                            try{    
            if(dis.available()!=0) ta.appendText(dis.readUTF());
            Thread.sleep(200);
          }catch(Exception e3){System.out.println("Receive data failed...");}
                          }while(true);
          }         public static void main(String args[])
         {  new CServeru(); }
 
  }