import java.net.*;

import java.io.*;

public class simpleServer

{

private static ServerSocket serverSocket;

private static listenClient listen;

public static void main(String[] args) throws Exception

{

int port;

if(args.length==0)

{

System.out.println('Usage:java simpleServer [port]');

System.exit(1);

}

port=Integer.parseInt(args[0]);

startServer(port);

}

public static void startServer(int port)throws Exception

{

try

{

serverSocket=new ServerSocket(port);

Thread thread=new Thread(new listenClient(serverSocket));

thread.start();

}

catch (IOException ex)

{

ex.printStackTrace();

}

}

}

class listenClient implements Runnable

{

private ServerSocket serverSocket;

private Socket clientSocket;

DataInputStream in;

DataOutputStream out;

public listenClient(ServerSocket ser verSocket)throws Exception

{

this.serverSocket=serverSocket;

}

public void run()

{

try

{

while(true)

{

clientSocket=serverSocket.accept();

System.out.println('Connection from '+clientSocket.getInetAddress().getHostAddress());

in=new DataInputStream(clientSocket.getInputStream());

out=new DataOutputStream(clientSocket.getOutputStream());

String lineSep=System.getProperty('line.separator');//行分隔符，即回车换行

InetAddress addr=serverSocket.getInetAddress().getLocalHost();

String outData='Server Information: '+lineSep+' Local Host: '+serverSocket.getInetAddress().getLocalHost()+lineSep+' port :'+serverSocket.getLocalPort();

byte[] outByte=outData.getBytes();

out.write(outByte,0,outByte.length);

}

}

catch (Exception ex)

{

ex.printStackTrace();

}

}

};

import java.net.*;

import java.io.*;

public class simpleClient

{

private staticSocket socket;

public static void main(String[] args)throws Exception

{

String host;

int port;

if(args.length <2)

{

System.out.println('Usage:java simpleClient [remote IP/Host] [port]');

System.exit(1);

}

host=args[0];

port=Integer.parseInt(args[1]);

connectServer(host,port);

}

public static void connectServer(String host,int port)

{

try

{

socket=new Socket(InetAddress.getByName(host),port);

DataInputStream in=new DataInputStream(socket.getInputStream());

DataOutputStream out=new DataOutputStream(socket.getOutputStream());

byte[] inByte=new byte[1024];

in.read(inByte);

String response=new String(inByte,0,inByte.length);

System.out.println('Message from server: ');

System.out.println(response.trim());

}

catch (UnknownHostException e)

{

e.printStackTrace();

}

catch(IOException ex)

{

ex.printStackTrace();

}

finally

{

try

{

socket.close();

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

}