This document discusses JSP custom tags. It begins with an introduction to custom tags, noting that they separate business logic from JSP pages and allow logic to be reused. It then covers the syntax of custom tags, including attributes. A simple example tag is provided to demonstrate how to create a tag handler class, Tag Library Descriptor (TLD) file, and use the tag within a JSP page. The document also discusses how to define properties and setter methods to work with tag attributes, and how to enable iteration within a custom tag.

1. {
JSP custom tags
}

2. 1. Introduction to JSP
2. Scripting elements
3. Running a Simple JSP program
4. Custom tags
1. Introduction
2. Advantages
3. Fields & Methods
4. A simple Custom tag
5. Attributes in Custom tags
6. Iteration in Custom tags

3. 1. Just like Servlets its also used to create Web applications
2. It can be thought of as an extension to Servlets
3. A JSP page consists of HTML tags and JSP tags
4. It provides some additional features
1. Expression Language
2. Custom Tags, etc
A brief Intro to JSP

4. 1. Extension to Servlet
2. Easy to maintain
3. Fast Development: No need to recompile and redeploy
4. Less code than Servlet
Advantages

5. Scripting elements
The scripting elements provides the ability to insert java code inside the jsp.
• scriptlet tag
A scriptlet tag is used to execute java source code in JSP.
• expression tag
written to the output stream of the response

6. • declaration tag
The JSP declaration tag is used to declare fields and methods.

7. A simple JSP page

8. Custom tags
Introduction
• Custom tags are user-defined tags.
• They separates the business logic from the JSP page.
• The same business logic can be used many times by the use of custom tag.

9. Syntax of custom tag
1. < prefix : tagname />
2. < prefix : tagname attr1 = value1 ...attrn = valuen />
3. < prefix : tagname attr1 = value1 ...attrn = valuen >
body code
</ prefix : tagname >

10. Fields & Methods

12. A simple custom tag
example
• Create the Tag handler class and perform action at the start or at the end of
the tag.
• Create the Tag Library Descriptor (TLD) file and define tags
• Create the JSP file that uses the Custom tag defined in the TLD file

13.  Define the property in the TagHandler class with the attribute
name and define the setter method.
 Define the attribute element inside the tag element in the TLD file
Attributes in custom tags
< m : cube number = “ 4 “ > < / m : cube >

14.  doAfterBody()
 EVAL_BODY_AGAIN
Iteration in Custom tags

15. Bye…