Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.
A.13 Using JavaBeans with JSP
539
            code="MyApplet.class"
            width="475" height="350">
Error: this example requires Java.
  The Java Web Server does not properly handle 
jsp:fallback
.
A.13 Using JavaBeans with JSP
Basic Requirements for Class to be a Bean
1. Have a zero argument (empty) constructor. 
2. Have no public instance variables (fields). 
3. Access persistent values through methods called 
getXxx
 (or 
isXxx
) and 
setXxx
.
Basic Bean Use
value="value" />
The 
value
 attribute can take a JSP expression.
Associating Properties with Request Parameters
  Individual properties: 
    name="entry"
    property="numItems"
    param="numItems" />
  Automatic type conversion: for primitive types, performed according 
to 
valueOf
 method of wrapper class.
  All properties: 
Sharing Beans: The scope Attribute of 
jsp:useBean
Examples of sharing beans given in Chapter 15.
  page
Default value. Indicates that, in addition to being bound to a local 
variable, bean object should be placed in 
PageContext
 object for 
duration of current request. 
Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.
Servlet and JSP training courses by book's author: courses.coreservlets.com.






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