在UDP數據報中發送的消息未經過清理？

Question

我的代碼如下。 一切都按照我想要的方式工作，但是當收到我的消息時，它們的末尾都有許多類似“ Message：hello▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀”的框▀▀▀▀▀▀▀”我該怎么做，所以接收和打印的只是“消息：你好”？ 我非常感謝您的幫助。

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

public class UDPChat {

    public static void main(String args[]) throws Exception {

        new UDPChat();
    }


    public UDPChat() {
        try {
            runChat();
        } catch (Exception e) {
        }}

    public void runChat() throws InterruptedException {
        Sender sender = new Sender();
        Receiver receiver = new Receiver();
        sender.start();
        receiver.start();
        sender.join();
        receiver.join();
    }

    class Receiver extends Thread {
        public void run() {
            try {
                DatagramSocket serverSocket = new DatagramSocket(9876);
                byte[] receiveData = new byte[1024];
                while (true) {
                    DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
                    serverSocket.receive(receivePacket);
                    String sentence = new String(receivePacket.getData());
                    System.out.println("Message: " + sentence);
                }
            } catch (IOException e) {
            }
        }
    }

    class Sender extends Thread {
        public void run() {
            try {
                DatagramSocket clientSocket = new DatagramSocket();
                InetAddress IPAddress = InetAddress.getByName("localhost");
                byte[] sendData = new byte[1024];
                while (true) {
                BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
                String message = inFromUser.readLine();
                sendData = message.getBytes();

                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 9876);
                clientSocket.send(sendPacket);
                }
            } catch (IOException e) {
            }
        }
    }

}

Answer 1

String sentence = new String(receivePacket.getData());

常見問題。 忽略數據報長度。 修復如下：

String sentence = new String(receivePacket.getData(), receivePacket.getOffset(), receivePacket.getLength());