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A J2EE application may require one or more initialization parameters to be accessed by one or more servlets in a web application.

Steps

An initialization parameter be for a context or for a specific servlet. The context level parameters can be accessed by any servlets in the web application.

Definition of a context parameter

To define a context parameter you have to add in the following in the web.xml as follows: 

<context-param>
  <param-name>filedir</param-name>
  <param-value>/temp</param-value>
</context-param>

Using the context.getInitParameter method

You have to use context.getInitParameter method to get the Context level parameter as in the following code: 

javax.servlet.ServletContext context = getServletContext();
String fileDir = context.getInitParameter("filedir");