Java UDP套接字 – 数据在服务器端遗留下来

我想做的就是让用户(客户端)向服务器发送消息,然后服务器将打印它.

我有一个例子,但我遗漏了一些东西,因为我有以下问题：

如果客户端将消息“a”发送到服务器,则会正确接收该消息.
如果客户端将消息“bbb”发送到服务器,则会正确接收该消息.
如果客户端将消息“c”发送到服务器,则服务器将打印“cbb”作为接收消息.

似乎服务器在收到新消息时会清理某种缓冲区.

这是我正在使用的代码：

服务器

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;



public class UDPServer {
public static void main(String args[]) throws Exception {
    byte[] receive_data = new byte[256];
    int recv_port;

    DatagramSocket server_socket = new DatagramSocket(5000);

    System.out.println("Server - Initialized server. Waiting for client on port 5000");

    while (true) {
        // System.out.println("Server - Listening for connections...");
        DatagramPacket receive_packet = new DatagramPacket(receive_data,receive_data.length);

        server_socket.receive(receive_packet);

        String data = new String(receive_packet.getData());

        InetAddress IPAddress = receive_packet.getAddress();

        recv_port = receive_packet.getPort();

        if (data.equals("q") || data.equals("Q")) {
            System.out.println("Server - Exiting !");
            break;
        } else {
            System.out.println("Server - Client from IP " + IPAddress + " @ port " + recv_port + " said : " + data + " (length: " + receive_packet.getLength() + ")");
        }
    }
}
}

客户

public class UDPClient {
public static void main(String args[]) throws Exception {
    byte[] send_data = new byte[256];

    BufferedReader infromuser = new BufferedReader(new InputStreamReader(System.in));

    DatagramSocket client_socket = new DatagramSocket();

    InetAddress IPAddress = InetAddress.getByName("localhost");

    System.out.println("Client - Initialized the client...");

    while (true) {
        System.out.print("Client - Type Something (q or Q to quit): ");

        String data = infromuser.readLine();

        if (data.equals("q") || data.equals("Q")) {
            System.out.println("Client - Exited !");
            DatagramPacket send_packet = new DatagramPacket(send_data,send_data.length,IPAddress,5000);
            System.out.println("Client - Sending data : <" + data + ">");
            client_socket.send(send_packet);
            break;
        } else {
            send_data = data.getBytes();
            DatagramPacket send_packet = new DatagramPacket(send_data,5000);
            System.out.println("Client - Sending data : <" + data + ">");
            client_socket.send(send_packet);
        }
    }

    client_socket.close();
}
}

我认为错误是微不足道的,但我在网络编程方面的技能是有限的,因此我不知道究竟是什么.

为了说清楚,我在不同终端上的同一台机器(mac)上运行服务器和客户端,以防它无论如何都会影响情况.

任何帮助将不胜感激.

编辑

……我回来回答我自己的问题.
问题是我没有定义服务器套接字应该读取的数据量.
因此,当我改变

String data = new String(receive_packet.getData());

同

String data = new String(receive_packet.getData(),receive_packet.getLength());

一切顺利.

仅供将来参考,以及可能遇到同样问题的人:)