网络编程-三要素

原创已于 2023-07-18 14:56:36 修改 · 76 阅读

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#网络 #java #服务器

于 2023-07-17 22:13:32 首次发布

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该文章展示了两个Java程序，一个用于发送UDP数据包到指定IP和端口，另一个用于接收数据。程序使用了InetAddress和DatagramSocket类，涉及IP地址、主机名、端口号以及数据包的创建和发送过程。

IP,端口号，协议

public class get {
    public static void main(String[] args) throws UnknownHostException {
        InetAddress id = InetAddress.getByName("127.0.0.1");
        System.out.println(id);
        String hostName = id.getHostName();
        System.out.println(hostName);
        String address = id.getHostAddress();
        System.out.println(address);
    }
}

发送

public class demo1 {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket();
        String str = new String("你好嘉宝");
        byte[] bytes = str.getBytes();
        InetAddress byName = InetAddress.getByName("127.0.0.1");
        int port = 10086;
        DatagramPacket dp = new DatagramPacket(bytes,bytes.length,byName,port);
        ds.send(dp);
        ds.close();

    }
}

接受

public class receive {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket(10086);

        byte[] bytes = new byte[1024];
        DatagramPacket dp = new DatagramPacket(bytes,bytes.length);

        ds.receive(dp);

        byte[] data = dp.getData();
        int len = dp.getLength();
        InetAddress address = dp.getAddress();
        int port = dp.getPort();

        System.out.println("接受的数据为" + new String(data,0,len) + ",该数据的地址和接受端口1分别为" + address + "," + port);

        ds.close();
    }
}