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【Java UDP Socket网络编程】模拟接收端和发送端随时互换角色,互发消息

凯约 2022-02-10 阅读 56

UDP的原生就比较容易啦,数据封装好了,只需要装包和拆包就行,上代码!
1.最初接收端代码:

public class Server { // 先充当接收端,后为发送端
    public static void main(String[] args) throws IOException {
        // 创建DatagramSocket,接收端口为9999
        DatagramSocket datagramSocket = new DatagramSocket(9999);

        // 接收信息
        byte[] buf = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length);
        datagramSocket.receive(datagramPacket);

        // String s = new String(datagramPacket.getData());
        // 拆包
        int length = datagramPacket.getLength();
        byte[] data = datagramPacket.getData();
        String s = new String(data, 0, length);
        System.out.println(s);

        // 回送信息
        byte[] data2 = "互换角色,发送给接收端".getBytes();
        DatagramPacket datagramPacket1 =
                new DatagramPacket(data2, data2.length, InetAddress.getByName("127.0.0.1"), 9998);
        datagramSocket.send(datagramPacket1);

        // 闭流
        datagramSocket.close();
    }
}

2.最初发送端代码:

public class Client { // 先充当发送端,后为接收端
    public static void main(String[] args) throws IOException {
        // 创建DatagramSocket,接收端口为9998
        DatagramSocket datagramSocket = new DatagramSocket(9998);

        // 发送信息
        byte[] data = "发给接收端".getBytes();
        DatagramPacket datagramPacket =
                new DatagramPacket(data, data.length, InetAddress.getByName("127.0.0.1"), 9999);
        datagramSocket.send(datagramPacket);

        // 接收信息
        byte[] buf = new byte[1024];
        DatagramPacket datagramPacket1 = new DatagramPacket(buf, buf.length);
        datagramSocket.receive(datagramPacket1);

        // 拆包
        int length = datagramPacket1.getLength();
        byte[] data1 = datagramPacket1.getData();
        String s = new String(data1, 0, length);
        System.out.println(s);

        // 闭流
        datagramSocket.close();
    }
}
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