Java实现UDP网络编程

Java实现UDP网络编程

Java可用DatagramSocket类实例化对象，使用UDP协议在服务器端和客户端之间传输数据。TCP协议与UDP协议的区别后续我会在计算机网络内容部分整理出来，这里就不详细描述了。

//发送端
@Test
public void sender() throws IOException {
    
    

    DatagramSocket datagramSocket = new DatagramSocket();



    String str = "我在通过UDP协议与你发送信息";
    byte[] data = str.getBytes();
    InetAddress inet = InetAddress.getLocalHost();//获取本地IP地址
    DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090);
    //9090为使用的端口号，使用前要确保他没有被进程占用

    datagramSocket.send(packet);

    datagramSocket.close();

}
//接收端
@Test
public void receiver() throws IOException {
    
    

    DatagramSocket datagramSocket = new DatagramSocket(9090);

    byte[] buffer = new byte[100];
    DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);

    datagramSocket.receive(packet);

    System.out.println(new String(packet.getData(),0,packet.getLength()));

    datagramSocket.close();
}