Three features of JavaBean

JavaBean has three features:

1. JavaBean must be a public class

2. JavaBean has a constructor without parameters. If the constructor of the public class contains parameters, this class cannot be used as a JavaBean.

3. JavaBean obtains attributes through getproperty and sets attributes through setproperty.

 

Declare JavaBean:

<JSP: usebean id = "cart" Scope = "session" class = "com. Jacky. shoppingcart"> </jsp: usebean>
Use Javabean:

<JSP: getproperty name = "cart" property = "quantity"/>

 

Note that the name attribute must be consistent with the ID attribute at the time of usage.