UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

University of West Attica · Department of Computer Engineering and Informatics

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Network Programming

Sockets

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Nikolaos Zacharis, Professor

UNIWA Profile

Co-supervisor: Georgios Meletiou, Laboratory Teaching Staff

UNIWA Profile

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Athens, February 2024

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README

Sockets

This project demonstrates a simple Client-Server application in Java, where the server sends a list of files to the client, processes a request to open a specific file, and handles communication over sockets.

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Table of Contents

Section	Folder/File	Description
1	assign/	Assignment material for the Sockets workshop
1.1	assign/Laboratory-Assessment-Assignment.pdf	Assignment description in English
1.2	assign/Εργασία-Αξιολόγησης-Εργαστηρίου.pdf	Assignment description in Greek
2	src/	Source code files for socket programming examples
2.1	src/Client.java	Java client implementation for socket communication
2.2	src/Server.java	Java server implementation for socket communication
3	README.md	Repository overview
4	INSTALL.md	Usage instructions

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1. Overview

The application consists of two main components:

• Server:
  Listens for client connections, sends a list of files, and responds to client requests.

• Client:
  Connects to the server, receives the list of files, requests a specific file, and interacts with the server.

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2. Features

1. Client-Server Communication

   • Server listens on port 8080 and accepts incoming connections.
   • Client sends requests for specific files and receives the server’s response.

2. File List Transfer

   • Server sends a list of 10 file names: 0.txt, 1.txt, ..., 9.txt.

3. File Request Handling

   • Client requests "1.txt" and server returns the content.
   • If any other file is requested, server responds with "File not found".

4. Continue or Disconnect

   • After processing a request, the server asks the client whether to continue ("y") or disconnect ("n").
   • On "n", the server sends a goodbye message and closes the connection.

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3. Code Structure

• Server.java:
  Implements the server, listening on port 8080, sending file names, and responding to file requests.

• Client.java:
  Implements the client, connects to the server, receives the file list, requests a file, and handles server responses.

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4. Conclusion

This project provides a practical example of socket-based communication in Java, demonstrating file transfer, request handling, and interactive client-server protocols in a simple, extensible application.