Question

Modify the socket-based date server below so that the server services each client request in a separate thread.

import java.net.*;

import java.io.*;

public class DateClient

{

  public static void main(String[] args)  {

    try {

      /* make connection to server socket */

      Socket sock = new Socket(“127.0.0.1”,6013);

      InputStream in = sock.getInputStream();

      BufferedReader bin = new

        BufferedReader(new InputStreamReader(in));

      /* read the date from the socket */

      String line;

      while ( (line = bin.readLine()) != null)

        System.out.println(line);

      /* close the socket connection*/

      sock.close();

    }

    catch (IOException ioe) {

      System.err.println(ioe);

    }

  }

}

Answer 1

//

Bidirectional Thread:

Client.java

import java.io.*;
import java.net.*;

public class Client {
  
public static void main(String args[]) throws Exception
   {
       Socket sk=new Socket("127.0.0.1",5000);
       BufferedReader sin=new BufferedReader(new InputStreamReader(sk.getInputStream()));
       PrintStream sout=new PrintStream(sk.getOutputStream());
       BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
       String s;
       while (true)
       {
           System.out.print("Client : ");
           s=stdin.readLine();
           sout.println(s);
if (s.equalsIgnoreCase("BYE"))
{
System.out.println("Connection ended by client");
            break;
}
           s=sin.readLine();
           System.out.print("Server : "+s+"\n");
          
       }
       sk.close();
       sin.close();
       sout.close();
        stdin.close();
   }
  
}

Server.java

import java.io.*;
import java.net.*;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Server {

int port;
ServerSocket server=null;
Socket client=null;
ExecutorService pool = null;
int clientcount=0;
  
public static void main(String[] args) throws IOException {
Server serverobj=new Server(5000);
serverobj.startServer();
}
  
Server(int port){
this.port=port;
pool = Executors.newFixedThreadPool(5);
}

public void startServer() throws IOException {
  
server=new ServerSocket(5000);
System.out.println("Server Booted");
System.out.println("Any client can stop the server by sending -1");
while(true)
{
client=server.accept();
clientcount++;
ServerThread runnable= new ServerThread(client,clientcount,this);
pool.execute(runnable);
}
  
}

private static class ServerThread implements Runnable {
  
Server server=null;
Socket client=null;
BufferedReader cin;
PrintStream cout;
Scanner sc=new Scanner(System.in);
int id;
String s;
  
ServerThread(Socket client, int count ,Server server ) throws IOException {
  
this.client=client;
this.server=server;
this.id=count;
System.out.println("Connection "+id+"established with client "+client);
  
cin=new BufferedReader(new InputStreamReader(client.getInputStream()));
cout=new PrintStream(client.getOutputStream());
  
}

@Override
public void run()
{
int x=1;
try{
while(true){
s=cin.readLine();
             
           System. out.print("Client("+id+") :"+s+"\n");
           System.out.print("Server : ");
           //s=stdin.readLine();
s=sc.nextLine();
if (s.equalsIgnoreCase("bye"))
{
cout.println("BYE");
x=0;
System.out.println("Connection ended by server");
break;
}
           cout.println(s);
       }
      
  
cin.close();
client.close();
       cout.close();
if(x==0) {
           System.out.println( "Server cleaning up." );
           System.exit(0);
}
}
catch(IOException ex){
System.out.println("Error : "+ex);
}
  
       
}
}
  
}

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