udpclient.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 UDPClient
{
	public static void main(String args[]) throws Exception
	{
		BufferedReader inFromUser =
		new BufferedReader(new InputStreamReader(System.in));
		DatagramSocket clientSocket = new DatagramSocket();
		InetAddress IPAddress = InetAddress.getByName("127.0.0.1");
		byte[] sendData = new byte[1024];
		byte[] receiveData = new byte[1024];
		String sentence = inFromUser.readLine();
		sendData = sentence.getBytes(); DatagramPacket sendPacket =
		new DatagramPacket(sendData, sendData.length, IPAddress, 9876);
		clientSocket.send(sendPacket);
		DatagramPacket receivePacket =
		new DatagramPacket(receiveData, receiveData.length);
		clientSocket.receive(receivePacket);
		String modifiedSentence =
		new String(receivePacket.getData());
		System.out.println("FROM SERVER:" + modifiedSentence);
		clientSocket.close();
	}
}