pringbott处理udp数据分段收发的代码

以下是一个处理UDP数据分段收发的示例代码，基于Spring Boot框架编写：

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

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component
public class UdpServer {
    private DatagramSocket socket;

    public UdpServer() {
        try {
            socket = new DatagramSocket(12345);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Async
    public void start() {
        try {
            byte[] receiveBuffer = new byte[1024];
            DatagramPacket receivePacket = new DatagramPacket(receiveBuffer, receiveBuffer.length);
            while (true) {
                socket.receive(receivePacket);
                String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
                System.out.println("Received message: " + message);

                byte[] sendBuffer = "Hello, world!".getBytes();
                DatagramPacket sendPacket = new DatagramPacket(sendBuffer, sendBuffer.length, receivePacket.getAddress(),
                        receivePacket.getPort());
                socket.send(sendPacket);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void stop() {
        if (socket != null) {
            socket.close();
        }
    }
}

上述代码通过创建DatagramSocket对象指定端口号为12345，然后在start方法中循环接收UDP数据包并处理。接收到UDP数据包后，将消息转换为字符串并输出到控制台，然后创建一个新的DatagramPacket对象用于回复消息。最后调用DatagramSocket对象的send方法发送UDP数据包。

需要注意的是，上述代码中使用了@Async注解将start方法异步执行，以免阻塞主线程。同时，在停止应用程序时需要调用stop方法关闭DatagramSocket对象。