TCP--UDP的服务器和客户端程序

import java.io.*; import java.net.*; class UDPClient { public static void main (String argv[]) throws Exception { BufferedReader inFromUser = new BufferedReader(new InputStreamReader (System.in)); DatagramSocket clientSocket = new DatagramSocket(); InetAddress IPAddress = InetAddress.getByName("125.221.168.44"); 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,8080); 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(); } }