3.发送并接收long类型的数据

发送方发送了"1000L"的数据，接收方接收并输出。

1.发送方

package javase.net.socket;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UDPClientLong {

	public static void main(String[] args) {
		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			DataOutputStream dos = new DataOutputStream(baos);
			dos.writeLong(1000L);
			byte[] buf = baos.toByteArray();
			DatagramPacket dp = new DatagramPacket(buf, buf.length,
					new InetSocketAddress("127.0.0.1", 8888));
			DatagramSocket ds = new DatagramSocket(9999);
			ds.send(dp);
			ds.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

 

2.接收方

package javase.net.socket;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UDPServerLong {
	public static void main(String[] args) {
		try {
			byte[] buf = new byte[1024];
			DatagramPacket dp = new DatagramPacket(buf, buf.length);
			DatagramSocket ds = new DatagramSocket(8888);
			ds.receive(dp);
			ByteArrayInputStream bais = new ByteArrayInputStream(dp.getData());
			DataInputStream dis = new DataInputStream(bais);
			long num = dis.readLong();
			System.out.println(num);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}