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DT2113InternetApplicationDevelopment.ppt
DT211/3 Internet Application Development The JSTL EL allows these objects to be accessed as ‘Implicit Variables’ Implicit variable are just pre-agreed fixed variable names that can be used in JSTL Expressions --? Think of as “variables that are automatically available to your JSP page”.. Setting up JSTL in a web application JSTL is provided as part of Tomcat 5 Ensure the two JSTL .jar files are copied into the WEB-INF\lib directory of your web application Ensure the taglib directive(s) is in your JSP page Comparing JSTL vs Scriptlets /isapi/product_id~{27F6F199-F5FD-474C-AC7F-B3FC2C1F57B6}/st~{94C03A97-1188-4875-8A06-17743BA224B7}/session_id~{6A766315-391B-4F55-9AFB-B5425F6196C5}/content/articlex.asp JSTL removes complexity by using tags instead of java code(abstraction) JSP pages using JSTL usually easier to maintain JSTL allows HTML ‘tag’ developers to ‘program’ JSTL often more difficult to debug Note: Using JSTL does not eliminate scriplets entirely.. may still need them sometimes for more complex logic Info on JSTL 1. Java Server Pages by Hans Bergsten – full reference on all JSTL tags in the Appendix. 2. Sun tutorial. Contains examples. Chapter 17 is on JSTL at: /webservices/docs/1.1/tutorial/doc/index.html 3. Sun’s JSTL 1.0 tag specification on distrib. Good for definition of each tag. Poor on examples. * JSP: Actions elements and JSTL Introduction Previously, identified that JSP provides a variety of techniques to enable dynamic processing: Directive elements Action elements and JSTL Scripting elements Java Beans So far, have lookedat these JSP Action elements Action elements are an important syntax element in JSP They are represented by tags (as is HTML) They assist JSP developers to develop in tags rather thanscriplet programming Instead of %, they just use the character (like HTML) prefix:action_name body /prefix:action_name JSP Action elements JSP tags have a “start tag”, a “tag body” and an “end tag”. The start
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