Java Reference
In-Depth Information
// write the current value of the property count
out.println(“Count from scriptlet code : “
+ counter.getCount() + “<BR>”);
<!-- Get the bean's count property, -->
<!-- using the jsp:getProperty action. -->
Count from jsp:getProperty :
<jsp:getProperty name=”counter” property=”count” /><BR>
In the BeanCounter.jsp page, you perform five actions that give examples of using beans in a
JSP. You first tell the JSP engine that the scripting language you are using is Java, with the fol-
lowing snippet:
<%@ page language=”java” %>
You then create an instance of the class Counter , with a scope of session , and assign it an id
of counter . You do this using the standard action <jsp:useBean> . Now you can reference this
bean, by using the name counter , throughout the rest of your JSP. The code snippet that cre-
ates the bean is as follows:
<jsp:useBean id=”counter” scope=”session” class=”Counter” />
The third action sets the bean's count property to the value of the count parameter, if it exists
in the request. The code snippet that performs this action is as follows:
<!-- Set the bean's count property to the value of -->
<!-- the request parameter “count”, using the -->
<!-- jsp:setProperty action. -->
<jsp:setProperty name=”counter” property=”count” param=”count” />
In this snippet, you use the <jsp:setProperty> standard action to set the value of the count
property. You do this by setting the name attribute to the name of the bean you want to refer-
ence, the property attribute to the name of the property to be set, and the param attribute to the
name of the request parameter you want to set the property to.
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