Java：UDP协议传送数据

原创已于 2022-04-10 12:28:24 修改 · 428 阅读

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于 2019-07-24 11:31:33 首次发布

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

//发送数据
public class sent {
	public static void main(String[] args) throws IOException {
		DatagramSocket ds=new DatagramSocket();
		String s="hello UDP!";
		byte[] bys=s.getBytes();
		int length=bys.length;
		InetAddress address=InetAddress.getByName("LAPTOP-V84TLHG6");
		int port=7777;
		DatagramPacket dp=new DatagramPacket(bys, length, address, port);
		ds.send(dp);
		ds.close();
	}
}


import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

//接收数据
public class recieve {
	public static void main(String[] args) throws IOException  {
		DatagramSocket ds=new DatagramSocket(7777);
		byte[] bys=new byte[1024];
		DatagramPacket dp=new DatagramPacket(bys, bys.length);
		ds.receive(dp);
		InetAddress address=dp.getAddress();
		byte[] data=dp.getData();
		int length=dp.getLength();
		System.out.println("address:"+address.getHostAddress());
		System.out.println(new String(bys,0,length));
		System.out.println("length:"+length);
		ds.close();
	}
}