Simple User Application Management

This is a Java-based Login Management System that allows users to perform CRUD (Create, Read, Update, Delete) operations on user data. The application uses a graphical user interface (GUI) built with Swing and stores user data in a JSON file.

Features

• Add User: Add a new user with a username and password.
• Update User: Update the username or password of an existing user.
• Delete User: Remove a user from the system.
• Welcome Screen: A central screen to navigate between different operations.
• JSON Storage: User data is stored in a user.json file for persistence.

Project Structure

Login/
├── build/
│   ├── classes/
│   └── ...
├── nbproject/
│   ├── build-impl.xml
│   ├── project.properties
│   └── ...
├── src/
│   └── Login/
│       ├── add.java
│       ├── update.java
│       ├── delete.java
│       ├── welcome.java
│       ├── user.json
│       └── ...
├── test/
├── build.xml
└── manifest.mf

Prerequisites

• Java Development Kit (JDK) 8 or higher
• Apache Ant (for building the project)
• NetBeans IDE (optional, for development)

How to Run

1. Clone the repository or download the source code.
2. Open the project in NetBeans or any Java IDE.
3. Build the project using the build.xml file:

   ant build

4. Run the application:

   ant run

5. The application will open a GUI window starting with the Welcome screen.

File Descriptions

• src/Login/add.java: Handles adding new users to the system.
• src/Login/update.java: Handles updating existing user details.
• src/Login/delete.java: Handles deleting users from the system.
• src/Login/welcome.java: The main navigation screen for the application.
• src/Login/user.json: Stores user data in JSON format.

JSON File Structure

The user.json file stores user data in the following format:

{
  "users": [
    {
      "username": "exampleUser",
      "password": "examplePassword"
    }
  ]
}

Key Classes and Methods

• add:

  • filecheck(): Reads and validates the user.json file.
  • btnAddActionPerformed(): Adds a new user to the system.

• update:

  • filecheck(): Reads and validates the user.json file.
  • updateButtonActionPerformed(): Updates user details.

• delete:

  • filecheck(): Reads and validates the user.json file.
  • btnDeleteActionPerformed(): Deletes a user from the system.

• welcome:

  • Navigation buttons to access Add, Update, and Delete screens.

Customization

• Modify the user.json file path in the add, update, and delete classes if needed.
• Update GUI components using the NetBeans Form Editor.

Author

Developed by enfaith1.