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A.14 Creating Custom JSP Tag Libraries

541

The Tag Library Descriptor File

  Within 

taglib

 element, contains 

tag

 element for each tag handler. 

E.g.:

prime

coreservlets.tags.PrimeTag

Outputs a random N digit prime.

EMPTY

length

false

The JSP File

<%@ taglib uri="some taglib.tld" prefix="prefix" %>

body

Assigning Attributes to Tags

  Tag handler: 

Implements 

setXxx

 for each attribute 

xxx

.

  Tag Library Descriptor: 

...

length

false

true <%   sometimes   %>

Including the Tag Body

  Tag handler: 

You should return 

EVAL_BODY_INCLUDE

 instead of 

SKIP_BODY

 from 

doStartTag

.

  Tag Library Descriptor: 

...

JSP

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.