File-Sharing-Using-Multi-Threaded-Java-Socket-Programming

Multiple clients send file to the Server, Server spawns a thread for each client, updates the file required by the client and sends it back to the respective client , using Multi-Threaded Java Socket Programming

Commands to run the Application

Open three terminals side by side, two inside the Client folder containing the client.java file and one terminal inside the Server folder containing the server.java file.

First run the Server

javac server.java

java server

Run the Client

javac client.java

java client

PROBLEM STATEMENT

Given the wines dataset, Implement a client server program.

The program should have the following functionality:

The client program should have the facility to update the wineswith values
Upon entering a quality(5,6,7)it should calculate the mean,median for that type of wine
The server program will provide the following features:
- On entering the quality it should display lowest pH
- Given the quality it should find highest alcohol content and write to a file called Q5.csv if the quality given is 5

SOLUTION AND CODE WORKFLOW

Server has started and is waiting for the client to connect.
Lets consider a scenario where 2 clients connect to server at same time (code allows multiple clients to connect)
Client 1 connects to the server.
Server creates object of ClientHandler class for each new client.
Server spawns a new thread using the object of ClientHandler class for each new client.
Server threads are waiting for the clients to send a CSV file
Clients reads the wines.csv and stores the data into a byte array[].
Clienta calculates and displays mean, median of pH, acidity and alcohol content for the given input quality value.
Clients send the byte array to the server and waits for the server’s response.
Server threads receive the byte array containing the data , sent by the respective clients.
Server threads create their own copy of wines.csv and writes the data from the byte array to the wines.csv.
Server threads read their copy of wines.csv line by line and calculates lowest ph and highest alcohol
Server threads creates Q + quality value +.csv for their respective clients and , writes to it and sends it back to client

Preview

BOTH CLIENTS CONNECT TO THE SERVER

SCENARIO 1 : CLIENTS SEND FILE 1 AFTER THE OTHER

CLIENT 1 SENDS THE FILE TO THE SERVER , SERVER PROCESSES IT AND SENDS BACK THE Q5.csv , SERVER WAITS FOR CLIENT 2 TO SEND THE FILE

CLIENT 2 SENDS THE FILE TO THE SERVER , SERVER PROCESSES IT AND SENDS BACK THE Q6.csv , SERVER WAITS FOR THE NEXT CLIENT TO CONNECT

SCENARIO 2 : BOTH CLIENTS SEND THE FILE TOGETHER

Both clients connect to the server
Client 1 enters the quality on client side and sends the file to server
Before server can send the Q5.csv, client 2 enters the quality on client side and sends the file to the server
Server processes and sends back Q5.csv to client 1.
Server then processes and sends back Q6.csv to client 2.
Server waits for the next client to connect.

san-coding/File-Sharing-Using-Multi-Threaded-Java-Socket-Programming