网络编程
6 UDP
6.1 初识Tomcat
服务端
- 自定义 S
- Tomcat S
客户端
- 自定义 C
- 浏览器 B
6.2 UDP
6.2.1 udp实现发送消息
接收端:
package com.duo.lesson03;import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;public class UdpServerDemo1 {public static void main(String[] args) throws Exception {//开放端口DatagramSocket datagramSocket = new DatagramSocket(9090);//接收数据包byte[] buffer = new byte[1024];DatagramPacket datagramPacket = new DatagramPacket(buffer, 0, buffer.length);datagramSocket.receive(datagramPacket); //阻塞接收System.out.println(datagramPacket.getAddress().getHostAddress());System.out.println(new String(datagramPacket.getData(), 0, datagramPacket.getLength()));//关闭连接datagramSocket.close();}
}
发送端:
package com.duo.lesson03;import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;//UDP不需要连接服务器
public class UdpClientDemo1 {public static void main(String[] args) throws Exception {//1.建立一个Socket用于发送包DatagramSocket datagramSocket = new DatagramSocket();//2.建一个包String msg = "您收到一条新消息";InetAddress inetAddress = InetAddress.getByName("localhost");int port = 9090;DatagramPacket datagramPacket = new DatagramPacket(msg.getBytes(), 0, msg.getBytes().length, inetAddress, port);//3.发送包datagramSocket.send(datagramPacket);//4.关闭流datagramSocket.close();}
}
运行结果: