By Budi Kurniawan
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Extra info for Java for the Web with Servlets, JSP, and EJB A Developer's Guide to J2EE Solutions
To retrieve initial parameters, you need the ServletConfig object passed by the servlet container to the servlet. After you get the ServletConfig object, you then can use its getInitParameterNames and getInitParameter methods. The getInitParameterNames does not take an argument and returns an Enumeration containing all the parameter names in the ServletConfig object. The getInitParameter takes a String containing the parameter name and returns a String containing the value of the parameter. Because the servlet container passes a ServletConfig object to the init method, it is easiest to write the code in the init method.
For example, you may want to have access to the ServletConfig object from the service method, when you are servicing the user. In this case, you need to preserve the ServletConfig object to a class level variable. This task is not difficult. You need to create a ServletConfig object variable and set it to the ServletConfig object returned by the servlet container in the init method. 4 gives the code that preserves the ServletConfig object for later use. First, you need a variable for the ServletConfig object.
Http, offers more advanced classes and interfaces that extend classes and interfaces from the first package. It is much more convenient to program using the second package. When you learn something, it is best to start with the basics and build a strong foundation. Servlet interface is very important because it encapsulates the life cycle methods of a servlet and it is the interface that all servlets must implement. You also need to know the servlet's context, which represents a servlet's environment, and the servlet's configuration.