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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.
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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");