Get servlet init params in servlet context listener

Question

 <listener>
    <listener-class>config</listener-class>
</listener> 
  <servlet>
<servlet-name>ProcessReg</servlet-name>
<servlet-class>ProcessReg</servlet-class>
<init-param>
    <param-name>text</param-name>
    <param-value>HelloWorld1</param-value>
</init-param>

public class config implements ServletContextListener {



@Override
public void contextInitialized(ServletContextEvent event) {
    ServletContext servletContext = event.getServletContext();
    String text1 = servletContext.getInitParameter("text");

In method contextInitialized(ServletContextEvent event) , If There would be two servlets , for example , Let's say name of the second servlet be Servlet2 and it let's say has also has init - param called text with value HelloWorld2 .

How does listener know to take ProcessReg servlet ?

How to get param from Servlet2 ??

Answer 1

You need to distinguish between servlet initialization parameters and context initialization parameters.

Context initialization parameters are:

• context-wide;
• declared in <context-param> elements directly under the <web-app> root;
• typically accessed using the ServletContext.getInitParameter() method, e.g. from inside a listener's contextInitialized() method.

Servlet initialization parameters are:

• servlet-specific;
• declared in <init-param> elements inside a <servlet> element;
• typically accessed using the ServletConfig.getInitParameter() method, e.g. from inside the servlet's init() method.