tcpserver.java

TCP/IP服务器端与客户端 你可以通过此建立一个TCP服务端

import java.io.*;
import java.net.*;
class TCPServer
{
	public static void main(String argv[]) throws Exception
	{
		String clientSentence;
		String capitalizedSentence;
		ServerSocket welcomeSocket = new ServerSocket(6789);
		while(true) 
		{
			Socket connectionSocket = welcomeSocket.accept();
			BufferedReader inFromClient =
			new BufferedReader(new
			InputStreamReader(connectionSocket.getInputStream()));
			DataOutputStream outToClient =
			new DataOutputStream(connectionSocket.getOutputStream());
			clientSentence = inFromClient.readLine();
			capitalizedSentence = clientSentence.toUpperCase() + '\n';
			outToClient.writeBytes(capitalizedSentence);
		}
	}
}