一个基于TCP的聊天程序

这是个基于TCP的连接
只能用于本地局域网中，怎么在互联网上用还有待研究：）！
这个程序只能在本机上用，要在局域网上用还要改一下！
代码如下：
服务器：

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;

public class ChatS extends Frame
{
TextField tf=new TextField(20);
TextArea ta=new TextArea();

ServerSocket server;
Socket client;
InputStream in;
BufferedReader br;
OutputStream out;
BufferedWriter bw;
public ChatS()
{
super("Server");
add("North",tf);
add("Center",ta);
setSize(250,250);
show();
try
{
server=new ServerSocket(5001);
client=server.accept();
ta.append("Client host:"+client.getInetAddress().getHostName()+"\n\n");
in=client.getInputStream();
out=client.getOutputStream();
}
catch(IOException ioe){}
while(true)
{
try
{
byte[] buf=new byte[200];
in.read(buf);
String str=new String(buf);
ta.append("Client say:"+str);
ta.append("\n");
}
catch(IOException e){}
}
}
public boolean action(Event e,Object o)
{
try
{
String str=tf.getText();
byte[] buf=str.getBytes();
tf.setText(null);
out.write(buf);
ta.append("I say:"+str);
ta.append("\n");
}
catch(IOException ioe){}
return true;
}
public static void main(String args[])
{
new ChatS();
}
}

客户端：

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;

public class ChatC extends Frame
{
TextField tf=new TextField(20);
TextArea ta=new TextArea();
Socket client;
InputStream in;
BufferedReader br;
OutputStream out;
BufferedWriter bw;
public ChatC()
{
super("Client");
add("North",tf);
add("Center",ta);
setSize(250,250);
show();
try
{
client=new Socket("127.0.0.1",5001);
ta.append("Connect to:"+client.getInetAddress().getHostName()+"\n\n");
in=client.getInputStream();
br=new BufferedReader(new InputStreamReader(in));
out=client.getOutputStream();
bw=new BufferedWriter(new OutputStreamWriter(out));
}
catch(IOException ioe){}
while(true)
{
try
{
byte[] buf=new byte[200];
in.read(buf);
String str=new String(buf);
ta.append("Server say:"+str);
ta.append("\n");
}
catch(IOException e){}
}
}
public boolean action(Event e,Object o)
{
try
{
String str=tf.getText();
byte[] buf=str.getBytes();
tf.setText(null);
out.write(buf);
ta.append("I say:"+str);
ta.append("\n");
}
catch(IOException ioe){}
return true;
}

public static void main(String args[])
{
new ChatC();
}
}

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