DayOff System

It is a little project which dedicated to reduce labor cost for small and medium businesses. It provides a web-based tool to assist every employee manage their leaves.

Development Environment

• JDK 1.8.0_151
• Eclipse Oxygen IDE for Java EE Developers
• Maven 3.3.9
• Tomcat 9.0.2
• SQL Server 2017

System Architecture

3-tier architecture

This project is designed with 3-tier architecture: web server, AP server and SQL server.

Web Server

In the web server, I use Spring 4 to achieve a MVC structure. To keep the controller layer simply handle request/response, I extract all business logic into the service layer.

AP Server

In the AP server, all database query logic (hibernate session) are put in the DAO layer. XML configuration contains three parts: datasource, sessionFactory (ORM settings) and DAOs (Dependency Injection: refer datasource and sessionFactory to every DAO by XML setting).

SQL Server

Each department cotains several users; each user has several leave events.

Demo

The website calendar is implemented with a JavaScript library, FullCalendar. All JavaScript's popup boxes are replaced with SweetAlert2.

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