UDP（User Datagram Protocol）是一种轻量级、高效的网络协议，适用于实时性要求较高的场景，比如视频直播或在线游戏。下面是一个简单的Java实现，帮助大家快速上手UDP通信！

首先，我们需要创建一个UDP服务器来接收数据。代码如下：

```java

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

public class UDPServer {

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

DatagramSocket serverSocket = new DatagramSocket(9876);

byte[] receiveData = new byte[1024];

DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);

System.out.println("UDP Server is running...");

serverSocket.receive(receivePacket);

System.out.println("Received: " + new String(receivePacket.getData(), 0, receivePacket.getLength()));

serverSocket.close();

}

}

```

接着，编写客户端发送数据：

```java

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class UDPClient {

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

String sentence = "Hello UDP!";

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

byte[] sendData = sentence.getBytes();

DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, address, 9876);

DatagramSocket clientSocket = new DatagramSocket();

clientSocket.send(sendPacket);

clientSocket.close();

}

}

```

运行服务器后启动客户端，即可看到消息传递成功！💡

UDP虽然简单高效，但也存在不可靠性问题，因此适合对可靠性要求不高的场景。快来试试吧！🚀