Servlet accessing init parameters

There are two types of init parameters.

1. Context init parameter which is accessible from all the servlets in a app. It can be accessed by following code.

getServletConfig().getServletContext().getInitParameter("companyName");

or

getServletContext().getInitParameter("companyName");


Deployment descriptor web.xml

<?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" id="WebApp_ID" version="3.1">
  <display-name>TestInitParameters</display-name>
   <context-param>
  <param-name>companyName</param-name>
  <param-value>Scotia bank Ltd</param-value>
  </context-param>
</web-app>



2. Servlet init paramters which is accessible from a servlet for which it is declared. It can be accessed by following code.

getServletConfig().getInitParameter("supportEmailAddress");



annotation:

@WebServlet(
urlPatterns = { "/TestInitParameter" },
initParams = {
@WebInitParam(name = "supportEmailAddress", value = "support@gmail.com")
})