UDP消息发送
作者:互联网
UDP
发短信:不用连接,需要知道对方的地址!
发送消息
package com.wang.netStudy.lesson03;
import com.sun.xml.internal.ws.api.message.Packet;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
//不需要连接服务器
public class UdpClientDemo01 {
public static void main(String[] args) throws IOException {
//1.建立一个Socket
DatagramSocket socket = new DatagramSocket();
//2.建个包
String msg = "你好啊,服务器!";
InetAddress localhost = InetAddress.getByName("localhost");
int port = 9090;
//数据,数据的长度起始,要发送给谁
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();
}
}
接收消息
package com.wang.netStudy.lesson03;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class UdpServerDemo01 {
public static void main(String[] args) throws IOException {
//开放端口
DatagramSocket socket = new DatagramSocket(9090);
//接收数据报
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);
socket.receive(packet);
System.out.println(packet.getAddress().getHostAddress());
System.out.println(new String(packet.getData(), 0, packet.getLength()));
//关闭连接
socket.close();
}
}
标签:DatagramSocket,UDP,java,packet,发送,消息,new,import,net 来源: https://www.cnblogs.com/wshjyyysys/p/15860464.html