1 
 2 
 3 
 4 
 5 
 6 
 7 
 8 
 9 
 10 
 11 
 12 
 13 
 14 
 15 
 16 
 17 
 18 
 19 
 20 
 21 
 22 
 23 
 24 
 25 
 26 
 27 
 28 
 29 
 30 
 31 
 32 
 33 
 34 
 35 
 36 
 37 
 38 
 39 
 40 
 41 
 42 
 43 
 44 
 45 
 46 
 47 
 48 
 49 
 50 
 51 

package com.koor.hello;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet( urlPatterns="/lifecycle", loadOnStartup=1)
public class LifeCycleServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    private String databaseURL;
    private int counter;
    

    
    @Override
    public void init() throws ServletException {
        super.init();
        databaseURL = this.getServletContext().getInitParameter( "DATABASE_URL" );
        System.out.println( "In init " + databaseURL );
        counter = 0;
    }
    
    /*@Override
    protected void service(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        super.service(request, response);
    }*/
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setHeader( "Demo", "A Value" );
        response.getWriter().append("Served at: ").append(request.getContextPath());
        counter++;
        System.out.println( "In doGet " + counter );
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        doGet(request, response);
    }

    @Override
    public void destroy() {
        System.out.println( "In destroy" );
        super.destroy();
    }
}

 1 
 2 
 3 
 4 
 5 
 6 
 7 
 8 
 9 
 10 
 11 
 12 
 13 
 14 
 15 
 16 
 17 
 18 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
                             http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">

    <display-name>Hello World Web application</display-name>
    
    <context-param>
        <param-name>DATABASE_URL</param-name>
        <param-value>jdbc:mysql://localhost:3306/Hello</param-value>
    </context-param>

    <welcome-file-list>
        <welcome-file>login</welcome-file>
    </welcome-file-list>

</web-app>