Below is a program to pass a number to a server, double it and return the number. Instead of passing a number between the client and server, I want to do the following:

What I need help doing is sending a user name to server, server checking to see if valid by reading from separate users.txt file, responding to client with codes listed below, if valid server asks for password and then checks txt file to see if valid. If not valid username or password send appropriate code and message.

Create both classes in same package

Need to first run the server, then run the client

Server will then respond with a code listed below(+, -, #, !)

+ =Success

- =Error

! =Logged in

The server will read from a separate users.txt file (args 0) containing user names and passwords that it will check if valid from clients input:

user1 pass1

MKL foo

user3 pass3

An example of what I want the client server interaction to look like. Order of operations when running program:

S: (listening for connection)

C: (opens connection)

S: Hello from Server

C: User MKL

S: +MKL valid, send password

C: PASS foo

S: ! logged in

Import java.util.Scanner;

public class client{

public static void main(String args[]) throws UnknownHostException,

{

int number, temp;

Scanner sc= new Scanner(System.in); //accept input from user

Socket s = new Socket(my ip address, port number);// create a socket, using ip address of local machine b/c run on same machine port#50001

Scanner sc1= new Scanner(s.getInputStream()); //used to get output from server

System.out.println(Enter a number);// accept num from user

number= sc.nextInt(); //pass number

PrintStream p = new PrintStream(s.getOutputStream()); // create printsteam object

p.println(number); // pass number to server through printstream object

temp= sc1.nextInt(); //get number from server and store

System.out.println(temp);

}}

Import java.io.IOException;

Import java.net.ServerSocket;

Import java.net.Socket;

Import java.util.Scanner;

public class server{

public static void main(String args[]) throws IOException{

int number,temp;

ServerSocket s1 = new ServerSocket(port number); // socket for server same port number(50001)

Socket ss = s1.accept(); // create another socket to accept number from client

Scanner sc= new Scanner(ss.getImputStream());// accept number from socket

number= sc.nextInt();// store number

temp=number*2;// double number

PrintStream p = new PrintStream(ss.GetOutputStream());// pass number to client

p.println(temp);// print

}}