通过UDP传输字节缓冲区

Question

你能够提供通过UDP数据报在两个Java类之间传输字节缓冲区的示例吗？

- none

Answer 1

这样行吗？

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class Server {
 public static void main(String[] args) throws IOException {
        // 创建DatagramSocket实例
        DatagramSocket socket = new DatagramSocket(new InetSocketAddress(5000));
        // 接收消息
        byte[] message = new byte[512];
        DatagramPacket packet = new DatagramPacket(message, message.length);
        socket.receive(packet);
        // 输出消息
        System.out.println(new String(packet.getData(), packet.getOffset(), packet.getLength()));
    }
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class Client {
 public static void main(String[] args) throws IOException {
        // 创建DatagramSocket实例并连接到指定地址和端口
        DatagramSocket socket = new DatagramSocket();
        socket.connect(new InetSocketAddress(5000));
        // 发送消息
        byte[] message = "Oh Hai!".getBytes();
        DatagramPacket packet = new DatagramPacket(message, message.length);
        socket.send(packet);
    }
}

- Dave Cheney

Answer 2

@none

DatagramSocket类确实需要改进，DatagramChannel对于客户端来说稍微好一些，但对于服务器编程来说有些困惑。例如：

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;

public class Client {
 public static void main(String[] args) throws IOException {
        DatagramChannel channel = DatagramChannel.open();
        ByteBuffer buffer = ByteBuffer.wrap("Oh Hai!".getBytes());
        channel.send(buffer, new InetSocketAddress("localhost", 5000));
    }
}

我认为JSR-203会更好。

- Dave Cheney