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13/05/2014 1 Java Server Pages A prettier form of  servlet! 1 Servlets •  Sun expected Servlets to replace CGI •  Basically … •  They didn't.  – They were popular with banks, insurance companies, and other high end applications  – But  were unappealing to amateur developers  – Small ISPs and web hosting companies unwilling to deploy Java server side 2 ASP & PHP •  Microsoft's Active Server Page technology  proved more popular  – though limited to Microsoft  IIS server •  PHP came from nowhere and easily outgrew servlets  – in number of  sites,  if  not importance  of  sites 3 ASP & PHP advantage •  Amateur developers  mostly developing  webapps with lots of  markup  and little processing code  – Compose a page as HTML  – Embed little scraps of  code that supply dynamic  content 4 Sun's response … •  Java Server Pages  – Basically a HTML document  – Embedded • Directives • Actions • Scriptlets  – These embedded elements  invoke processing • Return data strings that get embedded into the HTML 5 JSP & Servlets •  JSP is a servlet technology •  JSP page "compiled into a servlet" before use. •  Often combined  with other servlets  – Servlets do the "heavy lifting", results left in shared data structures  – Servlet forwards control to JSP page  – JSP page adds the "pretties“ •  Data extracted from shared data structures and embedded in amongst the “pretties”  As commented   previously,  servlet/JSP combination is similar  to the more recently  devised  PHP‐script/Smarty  combination  6

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