当客户端向服务器发送消息时，消息会被截断

Question

我是多线程新手。我正在尝试在客户端和服务器之间发送消息。当我向服务器发送消息时，服务器中的输出应该是“Aji Computer：Thanks！：D”，但我得到的是截断的数据“Aji Computer：Thank”。

服务器代码

    public QuoteServerThread(String name) throws IOException {
super(name);
socket = new DatagramSocket(4445);

 byte[] buf = new byte[256];
DatagramPacket packet = new DatagramPacket(buf, buf.length);

in.close();

socket.receive(packet);

String dString = "Wassup " + packet.getAddress().getHostName() + "!";
//if (in == null) dString = new Date().toString();
//else dString = getNextQuote();
buf = dString.getBytes();
InetAddress address = packet.getAddress();
int port = packet.getPort();
packet = new DatagramPacket(buf, buf.length, address, port);
socket.send(packet);

//THIS IS WHERE IM SUPPOSE TO PRINT "Aji Computer: Thanks! :D". But it prints out wrongly
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
String received = new String(packet.getData(), 0, packet.getLength());
System.out.println(received);   
socket.close();

客户端代码

   DatagramSocket socket = new DatagramSocket();
    byte[] buf = new byte[256];
    InetAddress address = InetAddress.getByName("Aji Computer");
    DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 4445);
    socket.send(packet);
    packet = new DatagramPacket(buf, buf.length);
    socket.receive(packet);
    String received = new String(packet.getData(), 0, packet.getLength());
    System.out.println("Server: " + received);

    //THIS IS WHERE I SENT MY "Aji Computer: Thanks! :D" PACKET TO SERVER.
    buf = new byte[256];
    String str = "Aji Computer: Thanks! :D";
    buf = str.getBytes();
    packet = new DatagramPacket(buf, buf.length, address, 4445);
    socket.send(packet);
    socket.close();

}

只是让您知道，此代码来自 Oracle。我做了一些修改，以便我知道它是如何工作的。

Answer 1

您将字节数组的大小从 256 字节重新分配为：buf = dString.getBytes(); 在程序中，您使用 packet = new DatagramPacket 创建了一个要接收的新数据包(buf, buf.length); 这使用 dString.getBytes() 的长度而不是 byte[256] 我假设dString.getBytes() 的空间比“Aji Computer：Thanks!”小

尝试将字节数组重新分配为其原始值：

buf = new byte[256];

编辑：从上面删除了“字节”