Tulisan kali ini merupakan salah satu bagian dari mata kuliah Pemrograman Jaringan pada penulisan saya sebelumnya yaitu Client Server Menggunakan Java Programming. tulisan ini akan membahas dan memberi contoh UDP client server. berikut adalah isi programnya
Udpserver.java(Server)
package udpserver;
import java.net.*;
import java.io.*;
public class Udpserver {
public static void main(String[] args) {
try{
System.out.println ("UDP Server
demo");
System.out.println ("Binding ke
port 8088");
DatagramSocket socket = new
DatagramSocket(8088);
System.out.println ("Bound local
port: " + socket.getLocalPort());
System.out.println ("Menunggu
packet datang...");
DatagramPacket packet = new
DatagramPacket( new byte[256], 256 );
socket.receive(packet);
System.out.println ("Packet
diterima!");
InetAddress remote_addr =
packet.getAddress();
System.out.println ("IP Address
pengirim : " + remote_addr.getHostAddress() );System.out.println
("Port pengirim: " + packet.getPort());
ByteArrayInputStream bin = new
ByteArrayInputStream(packet.getData());
for (int i=0; i < packet.getLength();
i++){
int data = bin.read();
if (data == -1)
break;
else
System.out.print ((char)data) ;
}
socket.close();
}
catch(Exception ex){
System.out.println("Error: " +
ex.getMessage());
}
}
Udpclient.java (Client)
package udpclient;
import java.net.*;
import java.io.*;
public class Udpclient {
public static void main(String[] args) {
try{
String hostname = "localhost";
System.out.println ("UDP client
demo");
System.out.println ("Binding ke
local port");
DatagramSocket socket = new
DatagramSocket();
System.out.println ("Bound local
port: " + socket.getLocalPort());
ByteArrayOutputStream stream = new
ByteArrayOutputStream();
PrintStream pOut = new
PrintStream(stream);
pOut.print ("Apa kabar!");
byte[] barray = stream.toByteArray();
DatagramPacket packet = new
DatagramPacket(barray, barray.length );
System.out.println ("Target
hostname: " + hostname );
InetAddress remote_addr =
InetAddress.getByName(hostname);
System.out.println ("IP Address
Hostname: " + remote_addr.getHostAddress());
packet.setAddress (remote_addr);
packet.setPort (8088);
socket.send(packet);
System.out.println ("Packet telah
terkirim!");
}
catch(Exception ex){
System.out.println("Error: " +
ex.getMessage());
}
}
}
dan hasil outputnya seperti pada gambar di bawah ini :
- output udpserver
- output udpclient
