package edu.wtbu;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class Demo07 {
public static void main(String[] args) throws IOException {
//开放端口
DatagramSocket socket = new DatagramSocket(9000);
//接收数据包
byte[] bytes = new byte[1024];
DatagramPacket packet = new DatagramPacket(bytes,0,bytes.length);
socket.receive(packet);//阻塞接收
System.out.println(packet.getAddress().getHostAddress());
System.out.println(new String(packet.getData(),0,packet.getLength()));
//关闭连接
socket.close();
}
}
package edu.wtbu;
import java.io.IOException;
import java.net.*;
public class Demo06 {
public static void main(String[] args) throws IOException {
//1.建立一个socket
DatagramSocket socket = new DatagramSocket();
//2.建个包
String msg = "你好";
InetAddress localhost = InetAddress.getByName("localhost");
int port=9000;
//数据，数据的起始长度，数据的长度，数据的ip，端口
DatagramPacket packet = new DatagramPacket(msg.getBytes(), 0, msg.getBytes().length,localhost,port);
//3.发送包
socket.send(packet);
//4.关闭流
socket.close();
}
}