JSP Standard Actions - Developing Java Servlets - page 258

T ABLE 16.2 Continued

Attribute Definition

The param attribute represents the name of the request parameter whose
value you want to set the named property to. A <jsp:setProperty> action
cannot have both param and value attributes referenced in the same action.

param

The value attribute represents the value assigned to the named bean's
property.

value

The <jsp:getProperty> Standard Action
The last standard action that references JavaBeans in JSPs is < jsp:getProperty> . It takes the
value of the referenced bean instance's property, converts it to a java.lang.String , and places
it into the implicit out object. The referenced bean instance must be defined and in scope
before this action references it. The syntax for the < jsp:getProperty> action is as follows:

<jsp:getProperty name=” name ” property=” propertyName ” />

Table 16.3 contains the attributes and their descriptions for the < jsp:getProperty> action.

T ABLE 16.3

The Attributes for the <jsp:getProperty> Action

Attribute Definition

This attribute represents the name of the bean instance from which the
property is obtained, defined by a <jsp:useBean> action or some other
action.

name

This attribute represents the bean property for which you want to get a
value.

property

A JSP Example Using JavaBeans
In this example, you'll use a simple JavaBean that acts as a counter. It has a single int prop-
erty, count , which holds the current number of times the bean's property has been accessed. It
also contains the appropriate methods for getting and setting this property. Listing 16.1 con-
tains the source code for the Counter bean.

L ISTING 16.1

Counter.java

public class Counter {

// Initialize the bean on creation
int count = 0;