[Java网络编程基础]UDP发送和接收数据

Posted 2021-06-26 Wecccccccc

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();

    }

}

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();

    }

}