Servlet Lifecycle Methods

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Sun Nov 03 2024 18:30:17 GMT+0000 (Coordinated Universal Time)

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//Servlet Lifecycle Methods

//input.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Servlet Lifecycle Example</title>
</head>
<body>
    <h2>Welcome to the Servlet Lifecycle Example</h2>
    <form action="ServletLifecycleExample1" method="post">
        <label for="name">Enter your name:</label>
        <input type="text" id="name" name="name" required>
        <input type="submit" value="Submit">
    </form>
</body>
</html>



//ServletLifecycleExample1.java

import java.io.IOException;
import java.io.PrintWriter;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@WebServlet("/ServletLifecycleExample1")
public class ServletLifecycleExample1 extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private int requestCount;

    // Constructor (optional)
    public ServletLifecycleExample1() {
        super();
        System.out.println("Servlet Constructor is called.");
    }

    // Initialization (called once when the servlet is first loaded)
    @Override
    public void init() throws ServletException {
        requestCount = 0;  // Initialize the request counter
        System.out.println("init() method called.");
    }

    // Service method (called for each client request)
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        requestCount++;  // Increment the request counter

        // Log the request count
        System.out.println("service() method called. Request count: " + requestCount);

        // Set content type for response
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        // Respond to the client
        out.println("<html><body>");
        out.println("<h1>Hello, " + request.getParameter("name") + "!</h1>");
        out.println("<p>This servlet has served " + requestCount + " request(s).</p>");
        out.println("</body></html>");
    }

    // Destruction (called once before the servlet is destroyed)
    @Override
    public void destroy() {
        System.out.println("destroy() method called.");
    }
}
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