Java Socket UDP Loop

Question

我正在尝试建立一个程序来查看数据包的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，我为此指定了发送文本片段的数据包大小。例如，如果我想在一个4字节的数据包中发送一个“Tester”字，它将发送“TEST”部分，但不会通过该字的其余部分重复。我试图添加一个while循环，但我不认为我有什么是正确的，因为它连续发送前4个字节。有谁知道我需要什么样的循环以及它应该放在哪里以获得我追求的结果？客户代码如下。非常感谢任何指导。

//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

Answer 1

你的意思是这样吗？

private void sendChunked( String msg, int chunkSizeInBytes ) {
   byte[] msgBytes = msg.getBytes();
   for( int index = 0; index < msgBytes.length ; index += chunkSizeInBytes ) {
         DatagramPacket packet = new DatagramPacket( msgBytes, index, Math.min( chunkSizeInBytes, msgBytes.length-index ));
         send( packet ); // You know how that works ...
   }
}