Ch. 7 beeing a jsp
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A JSP page is converted into a servlet at runtime. The servlet handles requests and responses, and incorporates the HTML, scriptlets, expressions, and other elements from the JSP page. The JSP lifecycle involves the container using directives to create an HttpServlet subclass, import statements, declaration statements, and build a _jspService() method that combines all the elements and runs the page. Elements like scriptlets and expressions are executed within the servlet and output is sent to the response.
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Jsp
The key differences between variables declared in a JSP declaration part versus a scriptlet are:
- Variables declared in a declaration part are instance variables of the generated servlet class, while variables declared in a scriptlet are local to the _jspService() method.
- Declaration part variables have broader scope across the entire JSP and servlet, while scriptlet variables are only accessible within the scriptlet.
JSPExecutor is a tool that allows executing JSP files from the command line or own applications, bypassing the servlet container. It is useful for code generation but lacks full servlet functionality.
Jsp
The key differences between variables declared in a JSP declaration part versus a scriptlet are:
- Variables declared in a declaration part are instance variables of the generated servlet class, while variables declared in a scriptlet are local to the _jspService() method.
- Declaration part variables have broader scope across the entire JSP and servlet, while scriptlet variables are only accessible within the scriptlet.
JSPExecutor is a tool that allows executing JSP files from the command line or own applications, bypassing the servlet container. It is useful for code generation but lacks full servlet functionality.
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Ch. 7 beeing a jsp
- 1. Chapter 7 Being a JSP
- 2. A JSP is a servlet
- 3. How many times I’ve been accessed
- 4. Fully qualified class or Import
- 5. Questions • Where each part of the JSP goes into the servlet code? • May I ServletContext and ServletConfig? • Type and syntax of the elements? • Lifecycle?
- 6. Elements • Scriptlet: <% %> • Directive: <%@ %> • Expression: <%= %> • Declaration: <%! %>
- 7. Directives, Scriptlets & Expressions
- 8. Beware! Expressions become arguments in out.print()
- 9. But JSPs are servlets
- 13. Importing methods & variables
- 14. JSP lifecycle • Look at the directives • Create an HttpServlet subclass • Writes • Import statements • Declaration statements • Builds a service method _jspService() • Combines all
- 15. Me Container, you JSP I will • give you the class • I might not show the generated Java • look at your directives • create an HttpServlet subclass • Tomcat extends: org.apache.jasper.runtime.HttpJspBase • write any imports or declarations statements in the class file, • imports just below the package statement • declarations below the class declaration and before the service method • build the service method _jspService() • called by the servlet superclass’ overridden service() method, and • receives HttpServletRequest & HttpServletResponse. • declare & initialize all implicit objects • combine HTML, scriptlets & expressions into the service method You should • not worry on how I do the above • Know how your elements work inside the generated servlet • and what jspInit(), jspDestroy & _jspService() are about
- 16. Example
- 17. API and implicit objects
- 18. API and the generated servlet
- 20. Initializing your servlet JSP Overwrite using declaration
- 21. Attributes in a JSP
- 23. Other (page) directives & attributes <%@ page import=”foo.*” session=”false” %> <%@ taglib tagdir=”/WEB-INF/tags/cool” prefix=”cool” %> <%@ include file=”wickedHeader.html” %>
- 24. EL (Expression Language) • Web page designers shouldn’t have to know Java. • Java code in a JSP is hard to change and maintain.
- 25. We have a choice
- 26. One last word: Actions (details later)