2. Using the Tutorial Examples
3. Getting Started with Web Applications
5. JavaServer Pages Technology
7. JavaServer Pages Standard Tag Library
Initializing and Finalizing a JSP Page
Programming Tags That Accept Scripting Elements
How Is a Classic Tag Handler Invoked?
Tag Handler Does Not Manipulate the Body
Tag Handler Manipulates the Body
10. JavaServer Faces Technology
11. Using JavaServer Faces Technology in JSP Pages
12. Developing with JavaServer Faces Technology
13. Creating Custom UI Components
14. Configuring JavaServer Faces Applications
15. Internationalizing and Localizing Web Applications
16. Building Web Services with JAX-WS
17. Binding between XML Schema and Java Classes
19. SOAP with Attachments API for Java
21. Getting Started with Enterprise Beans
23. A Message-Driven Bean Example
24. Introduction to the Java Persistence API
25. Persistence in the Web Tier
26. Persistence in the EJB Tier
27. The Java Persistence Query Language
28. Introduction to Security in the Java EE Platform
29. Securing Java EE Applications
31. The Java Message Service API
32. Java EE Examples Using the JMS API
36. The Coffee Break Application
Chapter 9
Scripting in JSP Pages
JSP scripting elements allow you to use Java programming language statements in yourJSP pages. Scripting elements are typically used to create and access objects, definemethods, and manage the flow of control. Many tasks that require the useof scripts can be eliminated by using custom tag libraries, in particular theJSP Standard Tag Library. Because one of the goals of JSP technology isto separate static data from the code needed to dynamically generate content, verysparing use of JSP scripting is recommended. Nevertheless, there may be some circumstancesthat require its use.
There are three ways to create and use objects in scripting elements:
Instance and class variables of the JSP page’s servlet class are created indeclarations and accessed inscriptlets andexpressions.
Local variables of the JSP page’s servlet class are created and used inscriptlets andexpressions.
Attributes of scope objects (seeUsing Scope Objects) are created and used inscriptlets andexpressions.
This chapter briefly describes the syntax and usage of JSP scripting elements.
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