JavasocketUDP循环

Question

我正试图建立一个程序，调查数据包的UDP性能和网络上的响应时间。我有一个客户端和服务器端类，我为它指定发送文本的数据包大小。例如，如果我想在一个4字节的数据包中发送一个单词“Tester”，它将发送“TEST”部分，但不会重复该单词的其余部分。我试图添加一个while循环，但我认为我的方法不正确，因为它连续发送前4个字节。有人知道我需要什么样的循环，以及应该放在哪里才能得到我想要的结果吗？下面是客户端的代码。非常感谢您的指导

//UDP Client
//Usage: java UDPClient [server addr] [server port]

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

public class UDPClient extends variable {

   // static Integer portNo = 4444;
    static Integer byteSize = 4;

    public static void main(String[] args) throws Exception {
      SocketForm form = new SocketForm();

      long startTime; // Starting time of program, in milliseconds.
      long endTime;   // Time when computations are done, in milliseconds.
      double time;  

        //get server address
        String serverName = "localhost";

        if (args.length >= 1)
            serverName = args[0];
      InetAddress serverIPAddress = InetAddress.getByName(serverName);

        //get server port;
        int serverPort = form.cliportNo;
        if (args.length >= 2)
            serverPort = Integer.parseInt(args[1]);
        //create socket
        DatagramSocket clientSocket = new DatagramSocket();
        //get input from keybaord
        byte[] sendData = new byte[byteSize];
        BufferedReader inFromUser = new BufferedReader(new InputStreamReader (System.in));
        while (true){ //incorrect as it is only repeating the first four bytes of the word typed in the console
        String sentence = inFromUser.readLine();
        startTime = System.currentTimeMillis();
        sendData = sentence.getBytes();
        //construct and send datagram;

        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverIPAddress, serverPort);
        clientSocket.send(sendPacket);

        //receive datagram
        byte[] receiveData = new byte [byteSize];

        DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
        clientSocket.receive(receivePacket);
        //print output
        String sentenceFromServer = new String(receivePacket.getData());
        System.out.println("From Server:" + sentenceFromServer);

        //close client socket
                //clientSocket.close();
        endTime = System.currentTimeMillis();
        time = endTime - startTime;
        //System.out.println("Time :" + time);
        }
    } //end of main
} //end of UDPClient