Using JavaBeans and JSP Scopes - Developing Java Servlets - page 276

The Counter JavaBean
As discussed in Chapter 16, “JSP Standard Actions,” the <jsp:useBean> standard action pro-
vides four different options for the scope attribute: page , request , session , and application .
We will discuss each of these and give an example of how to use them in the following sec-
tions.

For our examples, we will be using the Counter bean from Chapter 16, which acts as a simple
counter. It has a single int property, count , which holds the current number of times the
bean's property has been accessed. It also contains the appropriate methods for getting and set-
ting this property. Listing 17.1 contains the source for this bean.

L ISTING 17.1

Counter.java

import java.io.Serializable;
public class Counter implements Serializable{
// Initialize the bean on creation
int count = 0;

// Parameterless Constructor
public Counter() {

}

// Property Getter
public int getCount() {

// Increment the count property, with every request
count++;
return this.count;

}

// Property Setter
public void setCount(int count) {

this.count = count;

}

}

To use this bean you will need to compile it and move the class file to your
< SERVER_ROOT >/djs/WEB-INF/classes/ directory, if you have not already done so.