Writing Service Methods - Java EE.
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Servlet interface provides commonbehaviorto all the servlets.Servlet interface defines methods that all servlets must implement. Servlet interface needs to be implemented for creating any servlet (either directly or indirectly). It provides 3 life cycle methods that are used to initialize the servlet, to service the requests, and to destroy the servlet and 2 non-life cycle methods.
If an instance of the servlet does not exist, the web container: Loads the servlet class. Creates an instance of the servlet class. Initializes the servlet instance by calling the init method (initialization is covered in Creating and Initializing a Servlet). The container invokes the service method, passing request and response objects. Service methods are discussed in Writing Service Methods.
Once the servlet container calls the destroy() method, no service methods will be then called. That is after the exit of all the threads running in the servlet, the destroy() method is called. Hence, the servlet gets a chance to clean up all the resources like memory, threads etc which are being held.
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In Servlet API, I have discussed little bit about Http Servlet.In this article, I will discuss Http Servlet in detail. Unlike Generic Servlet, the HTTP Servlet doesn’t override the service() method. Instead it overrides the doGet() method or doPost() method or both.