In a two-layer web architecture, an application runs as part of the web server itself. one way of implementing such as architechture is to load java programs into the webserver. The java servlet specification defines an application programming interface for communication between the webserver and the application program, the HTTPSERVLET class in java implements the servlet API specification ;servlet classes used to implement specific functions are defined as subclasses of this classes. often the world SERVLET is used to refer to a java program that implements the servlet interface.
The code for a servlet is loaded into webbrowser when the server gets started, or when the server receives a remote HTTP request to execute a particular servlet. The task of a servlet is to process such a request,which may involve accessing a database to retrieve necessary information, and dynamically generate an HTML page to be returned to the client browser.
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