Java Web Robot Management API - Add, Delete, and Modify Robots

This Java Servlet API provides endpoints for managing robot data in a database. It allows users to add new robots, delete existing robots, and modify robot information. The API uses a JDBC connection to interact with the database and handles SQL statements for INSERT, DELETE, and UPDATE operations.

The code snippet you provided demonstrates the doPost method of the Robot servlet. This method handles HTTP POST requests and performs different actions based on the action parameter received in the request.

Adding a Robot

If the action parameter is 'addRobot', the code performs the following steps:

1. Get Robot Parameters: It retrieves the robot name, weight, and size from the request using the req.getParameter() method.
2. Create RobotInfo Object: It creates a RobotInfo object and sets the retrieved parameters to its corresponding attributes.
3. Prepare SQL Statement: It prepares an SQL INSERT statement to insert the robot data into the robot table in the database.
4. Execute SQL Statement: It executes the prepared SQL statement using the pstmt.executeUpdate() method.
5. Redirect Response: It redirects the response to './welcome.jsp' to display the updated robot list.

Deleting a Robot

If the action parameter is 'deleteRobot', the code performs the following steps:

1. Get Robot ID: It retrieves the ID of the robot to be deleted from the request.
2. Prepare SQL Statement: It prepares an SQL DELETE statement to remove the robot record from the Robot table.
3. Execute SQL Statement: It executes the prepared SQL statement using the pstmt.executeUpdate() method.
4. Redirect Response: It redirects the response to './welcome.jsp' to display the updated robot list.

Modifying a Robot

If the action parameter is 'changeRobot', the code performs the following steps:

1. Get Robot ID and Parameters: It retrieves the robot ID and updated name, weight, and size from the request.
2. Create RobotInfo Object: It creates a RobotInfo object and sets the updated parameters to its corresponding attributes.
3. Prepare SQL Statement: It prepares an SQL UPDATE statement to modify the robot record in the Robot table.
4. Execute SQL Statement: It executes the prepared SQL statement using pstmt.executeUpdate() method.
5. Redirect Response: It redirects the response to './welcome.jsp' to display the updated robot list.

This code demonstrates a basic implementation of a robot management API using Java Servlets. It provides essential functionalities for managing robot data in a database, and can be extended to include more complex operations and features.