tcpechoserver.java

JAVA SE6 全方位学习 朱仲杰 编著 机械工业出版社出版

import java.net.*;
import java.io.*;

public class TCPEchoServer
{
	public static void main(String args[])
	{
		int port = Integer.parseInt(args[0]);
		
		try
		{
			ServerSocket srv = new ServerSocket(port);
			System.err.println("Echo server start at port: "+port);
			
			while (true)
			{
				Socket clnt = srv.accept();
				DataInputStream dataIn=new DataInputStream(new BufferedInputStream(clnt.getInputStream()));
				DataOutputStream dataOut=new DataOutputStream(new BufferedOutputStream(clnt.getOutputStream()));
				
				System.out.println("Clinet connected from: "+clnt.getInetAddress());
				String req=dataIn.readUTF();
				String send = req.toUpperCase();
				dataOut.writeUTF(send);
				dataOut.flush();
				
				dataIn.close();
				dataOut.close();
			}
		}
		catch(IOException ioe)
		{
			System.err.println(ioe);
		}
	}
}