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.

JavaBeans Properties

A JavaBean property is a named attribute that can be accessed by the user of the object. The attribute can be of any Java data type, including the classes that you define.

A JavaBean property may be read, write, read only, or write only. JavaBean properties are accessed through two methods in the JavaBean’s implementation class −

S.No.

Method & Description

getPropertyName()

For example, if property name is firstName, your method name would be getFirstName() to read that property. This method is called accessor.

setPropertyName()

For example, if property name is firstName, your method name would be setFirstName() to write that property. This method is called mutator.

A read-only attribute will have only a getPropertyName() method, and a write-only attribute will have only a setPropertyName() method.

JavaBeans Example

Consider a student class with few properties −

package com.tecklearn;




public class StudentsBean implements java.io.Serializable {

   private String firstName = null;

   private String lastName = null;

   private int age = 0;




   public StudentsBean() {

   }

   public String getFirstName(){

      return firstName;

   }

   public String getLastName(){

      return lastName;

   }

   public int getAge(){

      return age;

   }

   public void setFirstName(String firstName){

      this.firstName = firstName;

   }

   public void setLastName(String lastName){

      this.lastName = lastName;

   }

   public void setAge(Integer age){

      this.age = age;

   }

}

Accessing JavaBeans

The useBean action declares a JavaBean for use in a JSP. Once declared, the bean becomes a scripting variable that can be accessed by both scripting elements and other custom tags used in the JSP. The full syntax for the useBean tag is as follows −

<jsp:useBean id = "bean's name" scope = "bean's scope" typeSpec/>

Here values for the scope attribute can be a page, request, session or application based on your requirement. The value of the id attribute may be any value as a long as it is a unique name among other useBean declarations in the same JSP.

Following example shows how to use the useBean action −

<html>

   <head>

      <title>useBean Example</title>

   </head>

  

   <body>

      <jsp:useBean id = "date" class = "java.util.Date" />

      <p>The date/time is <%= date %>

   </body>

</html>

You will receive the following result − −

The date/time is Thu Sep 30 11:18:11 GST 2010

Accessing JavaBeans Properties

Along with <jsp:useBean…> action, you can use the <jsp:getProperty/> action to access the get methods and the <jsp:setProperty/> action to access the set methods. Here is the full syntax −

<jsp:useBean id = "id" class = "bean's class" scope = "bean's scope">

   <jsp:setProperty name = "bean's id" property = "property name" 

      value = "value"/>

   <jsp:getProperty name = "bean's id" property = "property name"/>

   ...........

</jsp:useBean>

The name attribute references the id of a JavaBean previously introduced to the JSP by the useBean action. The property attribute is the name of the get or the set methods that should be invoked.

Following example shows how to access the data using the above syntax −

<html>

   <head>

      <title>get and set properties Example</title>

   </head>

  

   <body>

      <jsp:useBean id = "students" class = "com.tecklearn.StudentsBean">

         <jsp:setProperty name = "students" property = "firstName" value = "Zara"/>

         <jsp:setProperty name = "students" property = "lastName" value = "Ali"/>

         <jsp:setProperty name = "students" property = "age" value = "10"/>

      </jsp:useBean>




      <p>Student First Name:

         <jsp:getProperty name = "students" property = "firstName"/>

      </p>

     

      <p>Student Last Name:

         <jsp:getProperty name = "students" property = "lastName"/>

      </p>

     

      <p>Student Age:

         <jsp:getProperty name = "students" property = "age"/>

      </p>




   </body>

</html>

Let us make the StudentsBean.class available in CLASSPATH. Access the above JSP. the following result will be displayed −

Student First Name: Zara




Student Last Name: Ali




Student Age: 10

So, this brings us to the end of blog. This Tecklearn ‘Javabeans in JSP’ blog helps you with commonly asked questions if you are looking out for a job in Java Programming. If you wish to learn JSP and build a career Java Programming domain, then check out our interactive, Java and JEE Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

https://www.tecklearn.com/course/java-and-jee-training/

Java and JEE Training

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What you will Learn in this Course?

Introduction to Java

Java Fundamentals
Introduction to Java Basics
Features of Java
Various components of Java language
Benefits of Java over other programming languages
Key Benefits of Java

Installation and IDE’s for Java Programming Language

Installation of Java
Setting up of Eclipse IDE
Components of Java Program
Editors and IDEs used for Java Programming
Writing a Simple Java Program

Data Handling and Functions

Data types, Operations, Compilation process, Class files, Loops, Conditions
Using Loop Constructs
Arrays- Single Dimensional and Multi-Dimensional
Functions
Functions with Arguments

OOPS in Java: Concept of Object Orientation

Object Oriented Programming in Java
Implement classes and objects in Java
Create Class Constructors
Overload Constructors
Inheritance
Inherit Classes and create sub-classes
Implement abstract classes and methods
Use static keyword
Implement Interfaces and use it

Polymorphism, Packages and String Handling

Concept of Static and Run time Polymorphism
Function Overloading
String Handling –String Class
Java Packages

Exception Handling and Multi-Threading

Exception handling
Various Types of Exception Handling
Introduction to multi-threading in Java
Extending the thread class
Synchronizing the thread

File Handling in Java

Input Output Streams
io Package
File Handling in Java

Java Collections

Wrapper Classes and Inner Classes: Integer, Character, Boolean, Float etc
Applet Programs: How to write UI programs with Applet, Java.lang, Java.io, Java.util
Collections: ArrayList, Vector, HashSet, TreeSet, HashMap, HashTable

Java Database Connectivity (JDBC)

Introduction to SQL: Connect, Insert, Update, Delete, Select
Introduction to JDBC and Architecture of JDBC
Insert/Update/Delete/Select Operations using JDBC
Batch Processing Transaction
Management: Commit and Rollback

Java Enterprise Edition – Servlets

Introduction to J2EE
Client Server architecture
URL, Port Number, Request, Response
Need for servlets
Servlet fundamentals
Setting up a web project in Eclipse
Configuring and running the web app with servlets
GET and POST request in web application with demo
Servlet lifecycle
Servlets Continued
Session tracking and filter
Forward and include Servlet request dispatchers

Java Server Pages (JSP)

Fundamentals of Java Server Page
Writing a code using JSP
The architecture of JSP
JSP Continued
JSP elements: Scriptlets, expressions, declaration
JSP standard actions
JSP directives
Introduction to JavaBeans
ServletConfig and ServletContext
Servlet Chaining
Cookies Management
Session Management

Hibernate

Introduction to Hibernate
Introduction to ORM
ORM features
Hibernate as an ORM framework
Hibernate features
Setting up a project with Hibernate framework
Basic APIs needed to do CRUD operations with Hibernate
Hibernate Architecture

POJO (Plain Old Java Object)

POJO (Plain Old Java Object)
Persistent Objects
Lifecycle of Persistent Object

Spring

Introduction to Spring
Spring Fundamentals
Advanced Spring

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