According to Sun\'s web site, \"JSP technology is an extension of the servlet technology created to support authoring of HTML and XML pages\". Java Server pages appeared as the technology of using servlets showed out some disadvantages. One of the disadvantages is that for a simple Http response page, the code was quite large because it had to declare parameters, methods, writing HTML tags, etc. Another disadvantage was that for a single change, there was needed a skilled programmer. Observing all this, Sun developed a new technology, namely Java Server Pages, which are an extension to the servlet technology. The news was that a programmer could include in a static HTML page, portions of code. The extensions of the new files are .jsp. Here is made the delimitation first for example between the task of the web designer and the task of a code programmer.
There are two phases' processes that involve JSP pages:
o translation phase
As regarding the translation phase-also called compilation of the JSP pages-, these pages are translated to servlets before being run. This translation involves conversion of JSP source code into servlet source code by the JSP container. (this step called as compilation of a JSP page into a servlet, it is different from compilation of Java code into bytecodes.) After this translation, the servlet class is, itself, compiled. Because JSP pages are translated to servlets, they inherit servlets' request/response model. JSP pages, like servlets, are called in response to requests, and they produce responses. When the JSP container translates the body of a JSP page into a servlet, it produces a new class that implements the javax.servlet.Servlet interface. This class has a method called _jspService() that is built from the body of the JSP page.
