2-laboratoriya ishi mavzu: udp kliyent-server tarmoq dasturini yaratish Ishning maqsadi

2-LABORATORIYA ISHI
Mavzu: UDP kliyent-server tarmoq dasturini yaratish
Ishning maqsadi:
Talabalarda Java dasturlash tili java.net.* va java.io.* paketlari klasslaridan
foydalanib UDP kliyent-server tarmoq dasturini yaratish bo‘yicha amaliy
ko‘nikmalar hosil qilish.
Nazariy qism:
UDP serverini yaratish. UDP serveri kliyent ilovalariga xizmat ko‘rsatish
uchun UDP protokolidan foydalanadigan tarmoq ilovasidir. UDP serverini yaratish
uchun DatagramPacket obyektlarini kliyentlardan qabul qiladigan DatagramSocket
obyektidan foydalaniladi. UDP serverini yaratish uchun
quyidagilarni bajarish
kerak bo‘ladi:
DatagramSocket obyektidan foydalanib soket yaratish;
DatagramPacket klass obyektini yaratish va kliyent xabarlarini qabul qilish
uchun receive() metodidan foydalanish;
DatagramPacket klass obyektini yaratish va
kliyent xabarlarini uzatish
uchun send() metodidan foydalanish;
main() metodida UDP server klassi konstruktorini chaqirib, serverni ishga
tushirish.
Datagramma
paketini
qabul
qiluvchi
DatagramPacket
obyekti
datagrammalarni saqlash uchun buferga ega.
Qabul qiluvchiga yuborilgan DatagramPacket
obyekti qabul qilingan
ma’lumotlar obyektidan farq qiladi. Ushbu DatagramPacket obyekti xostning paket
yuborilgan IP-manzili va port nomeriga ega bo‘ladi.
4 ta parametrni qabul qiluvchi DatagramPacket klassining yangi packet
obyekti yaratiladi.
buffer: ma’lumotlarga ega bo‘lgan buferni beradi;
length: bufer
uzunligin baytlarda beradi;
address: datagramma yuboriladigan adresni beradi;
2
port: masofadagi kompyuter datagrammani qabul qilishda ishlatadigan
port nomerini beradi.
DatagramSocket klassining send() metodi
adresga DatagramPacket
obyektini yuboradi.
UDP serverini ishga tushirish uchun main() metodidagi konstruktor klassi
chaqiriladi.
Quyida UDP serverning Java kodi keltirilgan:
package udp;
import java.io.*;
import java.net.*;
class Server
{
public static void main(String args[]) throws Exception
{
DatagramSocket serverSocket = new DatagramSocket(9876);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
System.out.println("Server ishga tushdi!");
while(true)
{
DatagramPacket receivePacket = new
DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String( receivePacket.getData());
System.out.println("Qabul qilindi: " + sentence);
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket =
new DatagramPacket(sendData, sendData.length, IPAddress,
port);
serverSocket.send(sendPacket);
}
}
}
UDP kliyentini yaratish. UDP kliyenti
UDP protokolidan serverga
so‘rovlarni yuborish va server ilovasidan javoblarni qabul qilish uchun
3
foydalanadigan ilovadir. Foydalanuvchining UDP-ilovasida
UDP serveridan
xabarlarni qabul qiladigan DatagramSocket klass obyektini yaratish zarur, bu
uchun esa quyidagilarni bajarish lozim bo‘ladi:
1. Server bilan ulanish o‘rnatish uchun DatagramSocket
klass obyektidan
foydalanuvchi soketini yaratish.
2. DatagramPacket klass obyektini yaratish va xabarlarni serverga yuborish
uchun send() metodidan foydalanish.
3. DatagramPacket klass obyektini yaratish va serverdan yuborilgan
xabarlarni qabul qilish uchun receive() metodidan foydalanish.
DatagramSocket obyekti so‘rov yuboriladigan serverning IP-manzili va port
raqamini o‘z ichiga oladi.
Quyida UDP kliyentning Java kodi keltirilgan:
package udp;
import java.io.*;
import java.net.*;
class Client
{
public static void main(String args[]) throws Exception
{
System.out.println("Client ishga tushdi!");
BufferedReader inFromUser = new BufferedReader(new
InputStreamReader(System.in));
DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName("localhost");
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
String sentence = inFromUser.readLine();
sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData,
sendData.length, IPAddress, 9876);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new
DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
System.out.println("SERVERDAN:" + modifiedSentence);
clientSocket.close();
}
}