4 JavaBean

WEEK 5: JSP

EXPRESSION LANGUAGE (EL) Matt Green MS.Ed , Instructor at WCTC 152

197 DISTRIBUTED JAVA JavaBeans 2 JavaBeans What is a JavaBean A Java class written according to the JavaBeans API specifications. § It provides a default, no

argument constructor. § It should be serializable and that which can implement the Serializable interface. § It may have a number of properties which can be read or written. § It may have a number of "getter" and "setter" methods for the properties. 3 JavaBeans JavaBean Properties getPropertyName () Also called an accessor. setPropertyName () Also called a mutator. 4 JavaBeans Serializable ... implements java.io.Serializable A mechanism of converting the state of an object into a byte stream to persist the object. Deserialization is the reverse process where the byte stream is used to recreate the actual Java
object in memory. 5 Cookies Handling 6 HTTP cookie HTTP cookie or Cookie A small piece of data sent from a website and stored on the user's computer by the user's web browser while the user is browsing. Cookies were designed to be a reliable mechanism for websites to remember stateful information (such as items added in the shopping cart in an online store) or to record the user's browsing activity (including clicking particular buttons, logging in, or recording which pages were visited in the past). They can also be used to remember arbitrary pieces of information that the user previously entered into form fields such as names, addresses, passwords, and credit card numbers. Wikipedia.com 7