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package UDP_Client;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.UnknownHostException;

public class UDP_Client {

private InetAddress remoteHost = InetAddress.getLocalHost();

private int remoteport = 9999;

private DatagramSocket datagramSocket = null;

public UDP_Client()throws IOException{

datagramSocket = new DatagramSocket(null);

datagramSocket.setReuseAddress(true);

datagramSocket.bind(new InetSocketAddress(remoteHost,remoteport));

}

public void Echo(){

try {

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

String message = localReader.readLine();

byte[] outputData = message.getBytes();

DatagramPacket outputPacket = new DatagramPacket(outputData, outputData.length,remoteHost,remoteport);

outputPacket.setData(outputData);

datagramSocket.send(outputPacket);//給Server發數據包

//System.out.println(new String(outputPacket.getData(),0,outputPacket.getLength()));

while( true ){

DatagramPacket inputPacket = new DatagramPacket(new byte[512], 512);

datagramSocket.receive(inputPacket);

message = new String(inputPacket.getData(),0,inputPacket.getLength());

System.out.println(message);

if( message.equals("no more data !") || (message == null) )

break;

}

} catch (UnknownHostException e) { e.printStackTrace(); }

catch (IOException e) {e.printStackTrace(); }

finally{datagramSocket.close();}

}

public static void main(String[] args) throws IOException {

// TODO Auto-generated method stub

new UDP_Client().Echo();

}

}

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