Hackforge Academy

Explanation

The servlet lifecycle is controlled by the servlet container. The main stages are loading, initialization, request processing, and destruction.

Code:

Servlet Lifecycle:

Loading
   ↓
Instantiation
   ↓
init()
   ↓
service()
   ↓
destroy()

Explanation

The init() method is called once when the servlet is initialized by the container.

Code:

@Override
public void init() throws ServletException {
    System.out.println("Servlet initialized");
}

Explanation

The service() method receives requests and dispatches them to methods such as doGet() and doPost().

Code:

@Override
protected void service(HttpServletRequest req,
                        HttpServletResponse resp)
                        throws ServletException, IOException {
    super.service(req, resp);
}

Explanation

doGet() and doPost() are called according to the HTTP request method.

Code:

GET  → doGet()
POST → doPost()
PUT  → doPut()
DELETE → doDelete()

Explanation

The destroy() method is called once before the servlet is removed from the container.

Code:

@Override
public void destroy() {
    System.out.println("Servlet destroyed");
}