Write a client server program using sockets.

Question

In server a list of random thoughts are stored. Client request for a random thought. Using a random number, pick a random thought and post it to the client side.

(use c, c++ or python as programming languages)

Answer 1

import java.io.*;

import java.net.*;

class ThoughtServer

{

public void Go()

{

String thoughts[] = {"thought string #1","thought string #2","thought string #3"};

int numThoughts = thoughts.length;

try

{

ServerSocket serverSocket = new ServerSocket(80);

System.out.print(" waiting for client...");

Socket socket = serverSocket.accept();

PrintStream out = new PrintStream( socket.getOutputStream() );

InputStream inputStream = socket.getInputStream();

System.out.println("Waiting for request...");

int num_bytes;

while ((num_bytes = inputStream.available())<=0) { }

byte[] inbuff = new byte[num_bytes];

inputStream.read(inbuff);

String inbuffStr = new String(inbuff);

int thoughtNum = Integer.parseInt(inbuffStr);

if ((thoughtNum>=0) && (thoughtNum<numThoughts))

{

out.println(thoughts[thoughtNum]);

}

out.close();

inputStream.close();

socket.close();

}

catch (IOException ex)

{

System.out.println("IO Exception occurs");

}

}

public static void main(String args[])

{

(new ThoughtServer()).Go();

}

}

/*********************************************************************************************/

import java.io.*;

import java.net.*;

class ThoughtClient

{

public void Go(String argThoughtNum)

{

try

{

Socket socket = new Socket("127.0.0.1",80);

PrintStream out = new PrintStream( socket.getOutputStream() );

BufferedReader in = new BufferedReader( new InputStreamReader( socket.getInputStream() ) );

out.print(argThoughtNum);

String inbuff = in.readLine();

System.out.println(inbuff);

out.close();

in.close();

socket.close();

}

catch (IOException ex)

{

System.out.println("IO Exception occurs");

}

}

public static void main(String args[])

{

(new ThoughtClient()).Go(args[0]);

}

}