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jsp [2008/10/21 15:28] – created roumanijsp [2008/10/29 22:16] (current) – roumani
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 ====== MVC ====== ====== MVC ======
  
-This lecture covers the MVC design pattern for web applications in the context of a mini-project. This includes writing servlets to control and dispatch, models to model the data and the business rules, and JSP pages to author the view.+This week applies MVC to the design and implementation of the Electronic Voting System of Labs 3 and 4. This includes writing servlets to control and dispatch, beans and POJOs to model the data and the business rules, and JSP pages to author the view.
  
 ===== Outline ===== ===== Outline =====
  
   * The controller must control and dispatch by relying on the Model and forwarding to a JSP   * The controller must control and dispatch by relying on the Model and forwarding to a JSP
-  * Tomcat provides three ''Map<String,Object>'' places to hold data with three levels of scope: request, session, and application.+  * Tomcat provides three ''Map<String,Object>'' data structures to hold data with three levels of persistence: context, session, and request. A fourth level (available only to JSP servlets is the page). 
   * State can be captured using the session object. Its API allows us to detect the start of new sessions.   * State can be captured using the session object. Its API allows us to detect the start of new sessions.
   * The model is best packaged as a Java package.   * The model is best packaged as a Java package.
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   * The servlet's ''init'' method is responsible for instantiating the model and storing it in the application scope.   * The servlet's ''init'' method is responsible for instantiating the model and storing it in the application scope.
   * Jasper translates a JSP page to a servlet upon receiving the first reference to it (typically from a servlet forward).   * Jasper translates a JSP page to a servlet upon receiving the first reference to it (typically from a servlet forward).
-  * Jasper allows us to embed three things in the JSP page in addition to template (e.g. HTML) code: Expression Language EL, Directives, and Actions. These will be evaluated by Jasper and their values are served as part of the response. +  * Jasper allows us to embed three things in the JSP page: template code (such as HTML) which is served as-is, Expression Language [EL] which is served after evaluation, and special action tags which are served after executing the code behind them. It also support a few directives such as content type. 
-  * EL uses a number of built-in, implicit objects.+  * EL uses a number of built-in implicit objects.
   * Actions are either standard (JSTL) or custom.   * Actions are either standard (JSTL) or custom.
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 ===== To Do ===== ===== To Do =====
  
-  * Read the rest of Chapter 6. +  * Complete Labs 3 by doing [[http://www.cse.yorku.ca/~roumani/warp/labs/lab4.pdf|Lab-4]]. 
-  * Read Chapter 8 up to Section 8.4.1 but omit 8.3.2-8.3.3. +  * Read Chapter 6 up to and excluding Section 6.7. 
-  * Look at ''ELdemo.jspx'' and ''JSTLdemo.jspx'' in the //Resource Directory//. +  * Read Chapter 8 up to and excluding Section 8.5. 
-  * Do [[http://www.cse.yorku.ca/~roumani/warp/labs/lab4.htm|Lab-4]].+  * Look at the basic implementation of EVS in the //Resource Directory// under ''evs''. 
 +  * Look at ''ELdemo.jspx'' and ''JSTLdemo.jspx'' in the //Resource Directory// under ''jsp''.
jsp.1224602887.txt.gz · Last modified: by roumani