JSP ARCHITECTURE

 JSP pages are high level extension of servlet and it enable the developers to embed java code in html pages. JSP files are finally compiled into a servlet by the JSP engine. Compiled servlet is used by the engine to serve the requests.

javax.servlet.jsp package defines two interfaces:

• JSPPage

• HttpJspPage

These interfaces defines the three methods for the compiled JSP page. These methods are:

• jspInit()
• jspDestroy()
• _jspService(HttpServletRequest request,HttpServletResponse response)
    

In the compiled JSP file these methods are present. Programmer can define jspInit() and jspDestroy() methods, but the _jspService(HttpServletRequest request,HttpServletResponse response) method is generated by the JSP engine.