Review: Using JavaBeans

Components with JSP

Benefits of jsp:useBean

Hides the Java programming language syntax

Makes it easier to associate request parameters with 

objects (bean properties)

Simplifies sharing objects among multiple requests or 

servlets/JSPs

jsp:useBean 

Creates or accesses a bean

jsp:getProperty

Puts bean property (i.e. getXxx call) into output

jsp:setProperty

Sets bean property (i.e. passes value to setXxx)

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Review: Creating Custom 

JSP Tag Libraries

For each custom tag, you need

A tag handler class (usually extending

TagSupport or BodyTagSupport)

An entry in a Tag Library Descriptor file

A JSP file that imports library, specifies prefix, 

and uses tags

Simple tags

Generate output in doStartTag, return SKIP_BODY

Attributes

Define setAttributeName method. Update TLD file

Body content

doStartTag returns EVAL_BODY_INCLUDE

Add doEndTag method

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