UDP test

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

public class UDPClient {

public static void main(String[] args) {

// TODO Auto-generated method stub

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

System.out.println("보낼 자료 입력 : ");

String msg;

try {

msg = in.readLine();

DatagramSocket dsoc = new DatagramSocket();

InetAddress ia = InetAddress.getByName("127.0.0.1");

DatagramPacket dp = new DatagramPacket(msg.getBytes(),

msg.getBytes().length, ia, 7777);

dsoc.send(dp);

System.out.println("전송 완료");

dsoc.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

import java.net.DatagramPacket;

import java.net.DatagramSocket;

public class UDPServer {

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

DatagramSocket dsoc = new DatagramSocket(7777);

byte[] data = new byte[65508];

DatagramPacket dp = new DatagramPacket(data, data.length);

System.out.println("서버 서비스  시작...");

while (true) {

dsoc.receive(dp);

System.out.println("보낸 곳 주소 : "

+ dp.getAddress().getHostAddress());

System.out.println("자료 크기 : " + dp.getLength());

System.out.println("내용 : " + new String(dp.getData()).trim());

}

} catch (Exception e) {

System.out.println("오류 : " + e);

}

}

}

결과 :

서버 서비스  시작...

보낸 곳 주소 : 127.0.0.1

자료 크기 : 7

내용 : abcdefg