STOP AND WAIT PROTOCOL USING SOCKET PROGRAM
STOP AND WAIT pROTOCOL USING SOCKET PROGRAM
SENDER:
import java.io.*;
import java.net.*;
import java.util.Scanner;
class stopwaitsender
{
public static void main(String args[]) throws Exception
{
stopwaitsender sws = new stopwaitsender();
sws.run();
}
public void run() throws Exception
{
Scanner sc=new Scanner(System.in);
System.out.println(“Enter no of frames to be sent:”);
int n=sc.nextInt();
Socket myskt=new Socket(“localhost”,9999);
PrintStream myps=new PrintStream(myskt.getOutputStream());
for(int i=0;i<=n;)
{
if(i==n)
{
myps.println(“exit”);
break;
}
System.out.println(“Frame no “+i+” is sent”);
myps.println(i);
BufferedReader bf=new BufferedReader(new InputStreamReader(myskt.getInputStream()));
String ack=bf.readLine();
if(ack!=null)
{
System.out.println(“Acknowledgement was Received from receiver”);
i++;
Thread.sleep(4000);
}
else
{
myps.println(i);
}
}
}
}
RECEIVER:
import java.io.*;
import java.net.*;
class stopwaitreceiver
{
public static void main(String args[])throws Exception
{
stopwaitreceiver swr = new stopwaitreceiver();
swr.run();
}
public void run() throws Exception
{
String temp=”any message”,str=”exit”;
ServerSocket myss=new ServerSocket(9999);
Socket ss_accept=myss.accept();
BufferedReader ss_bf=new BufferedReader(new InputStreamReader(ss_accept.getInputStream()));
PrintStream myps=new PrintStream(ss_accept.getOutputStream());
while(temp.compareTo(str)!=0)
{
Thread.sleep(1000);
temp=ss_bf.readLine();
if(temp.compareTo(str)==0)
{ break;}
System.out.println(“Frame “+temp+” was received”);
Thread.sleep(500);
myps.println(“Received”);
}
System.out.println(“ALL FRAMES WERE RECEIVED SUCCESSFULLY”);
}
}
OUTPUT FOR SENDER:
C:\javaprog>javac stopwaitsender.java
C:\javaprog>java stopwaitsender
Enter no of frames to be sent:
4
Frame no 0 is sent
Acknowledgement was Received from receiver
Frame no 1 is sent
Acknowledgement was Received from receiver
Frame no 2 is sent
Acknowledgement was Received from receiver
Frame no 3 is sent
Acknowledgement was Received from receiver
OUTPUT FOR RECEIVER:
C:\javaprog>javac stopwaitreceiver.java
C:\javaprog>java stopwaitreceiver
Frame 0 was received
Frame 1 was received
Frame 2 was received
Frame 3 was received
ALL FRAMES WERE RECEIVED SUCCESSFULLY
NOTE:
Create separate java file for client and server
Run the Server.java file first then Client on different CMD or Terminal
Download the file here: SENDER Reciever
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