<%ServletContext servletContext = getServletContext();
InputStream input = getServletContext().getResourceAsStream("/WEB-INF/db.properties");
 if (input != null) {
     InputStreamReader isr = new InputStreamReader(input);
     BufferedReader reader = new BufferedReader(isr);
     PrintWriter writer = response.getWriter();
     String text;
     while ((text = reader.readLine()) != null) {
/*      System.out.println(text + "n"); */
         servletContext.setAttribute(text.split("=")[0], text.split("=")[1]);

     }
 }
%>

ServletContext servletContext = getServletContext();
        String driverDB = servletContext.getAttribute("driver").toString();
        String conn_urlDB = servletContext.getAttribute("conn_url").toString();
        String userNameDB = servletContext.getAttribute("userName").toString();
        String passwordDB = servletContext.getAttribute("password").toString();
DBConnection.getDataBaseProperty(driverDB, conn_urlDB, userNameDB, passwordDB);

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>TouchPoint</display-name>

  <welcome-file-list>
    <welcome-file>Login.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <display-name>LoginServlet</display-name>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.touchpoint.controller.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>com.touchpoint.controller.LogoutServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LogoutServlet</servlet-name>
    <url-pattern>/LogoutServlet</url-pattern>
  </servlet-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>ServletListenerExample</display-name>

  <context-param>
    <param-name>DBUSER</param-name>
    <param-value>pankaj</param-value>
  </context-param>
  <context-param>
    <param-name>DBPWD</param-name>
    <param-value>password</param-value>
  </context-param>
  <context-param>
    <param-name>DBURL</param-name>
    <param-value>jdbc:mysql://localhost/mysql_db</param-value>
  </context-param>

  <listener>
    <listener-class>com.journaldev.listener.AppContextListener</listener-class>
  </listener>

public class AppContextListener implements ServletContextListener {

    public void contextInitialized(ServletContextEvent servletContextEvent) {
        ServletContext ctx = servletContextEvent.getServletContext();

        String url = ctx.getInitParameter("DBURL");
        String u = ctx.getInitParameter("DBUSER");
        String p = ctx.getInitParameter("DBPWD");
}}