[Java网络编程基础]UDP发送和接收数据

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代码如下:

package InetAddressPack;import java.io.IOException;
import java.net.*;
import java.nio.charset.StandardCharsets;public class SendDemo {public static void main(String[] args) throws IOException {DatagramSocket ds = new DatagramSocket();byte[] bys = "hellp,udp,我来了".getBytes();int len = bys.length;InetAddress address = InetAddress.getByName("192.168.1.123");int port = 10086;DatagramPacket dp = new DatagramPacket(bys,len,address,port);ds.send(dp);ds.close();}
}

package InetAddressPack;import java.io.IOException;
import java.net.*;
import java.nio.charset.StandardCharsets;public class SendDemo {public static void main(String[] args) throws IOException {DatagramSocket ds = new DatagramSocket();byte[] bys = "hellp,udp,我来了".getBytes();
//        int len = bys.length;
//        InetAddress address = InetAddress.getByName("192.168.1.123");
//        int port = 10086;DatagramPacket dp = new DatagramPacket(bys, bys.length,InetAddress.getByName("192.168.1.123"),10086);ds.send(dp);ds.close();}}

在这里插入图片描述

代码如下：

package InetAddressPack;import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;public class ReceiveDemo {public static void main(String[] args) throws IOException {DatagramSocket ds = new DatagramSocket(10086);byte[] bys = new byte[1024];DatagramPacket dp = new DatagramPacket(bys,bys.length);ds.receive(dp);byte[] datas = dp.getData();int len = dp.getLength();String dataString = new String(datas,0,len);System.out.println("数据是"+dataString);ds.close();}}

package InetAddressPack;import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;public class ReceiveDemo {public static void main(String[] args) throws IOException {DatagramSocket ds = new DatagramSocket(10086);byte[] bys = new byte[1024];DatagramPacket dp = new DatagramPacket(bys,bys.length);ds.receive(dp);byte[] datas = dp.getData();int len = dp.getLength();
//        String dataString = new String(datas,0,len);
//        System.out.println("数据是"+dataString);System.out.println("数据是: "+new String(dp.getData(),0,dp.getLength()));ds.close();}}