8/21/2019 JSF Spring Hibernate Introduction

1/28

I am sick and cannot

go to university. Today is

the last date of registering

for a course. How can Iregister for the course?

 

8/21/2019 JSF Spring Hibernate Introduction

2/28

Idea!

I can use the website of

the university to register

for the course.

8/21/2019 JSF Spring Hibernate Introduction

3/28

8/21/2019 JSF Spring Hibernate Introduction

4/28

Wow!

The university website

is very interactive. In addition,

it is lightweight as its

Web pages are downloaded

rapidly.

How can you develop such a Web application?

8/21/2019 JSF Spring Hibernate Introduction

5/28

To develop such a Web application, you need to

reate a "ser Interface #"I$.

Implement business logic.

%tore data in the database.

8/21/2019 JSF Spring Hibernate Introduction

6/28

To create a "I, you need to

&lace "I components on a Web page.

8/21/2019 JSF Spring Hibernate Introduction

7/28

&erform conversions and validations of data entered by the

users in the "I components.

conversion

validation

8/21/2019 JSF Spring Hibernate Introduction

8/28

'ormat the appearance of "I components.

The font of button

caption is different

from the labels.

8/21/2019 JSF Spring Hibernate Introduction

9/28

%et the layout of Web pages.

(very Web page

has the same

layout.

8/21/2019 JSF Spring Hibernate Introduction

10/28

ustomi)e the "I components.

 * set of "I

components are

grouped into a

composite

component.

8/21/2019 JSF Spring Hibernate Introduction

11/28

+efreshes a part of the Web page asynchronously.

alidation is

performed and an

error message is

displayed instantly

without refreshing

the whole Webpage.

8/21/2019 JSF Spring Hibernate Introduction

12/28

%o, which technology

should I use to

develop such a Web

application?

8/21/2019 JSF Spring Hibernate Introduction

13/28

-ou can use ava%erver 'aces #%'$ to develop an

interactive and lightweight Web application.

%' provides

Inbuilt tags to create interactive user interfaces.

onverters and validators for performing conversions and

validations of user inputs.

%tyles to format the appearance of "I components.

Templates to set the layout of Web pages.

 *synchronous ava%cript and /01 #**/$ to refresh a part of

the Web page asynchronously.

8/21/2019 JSF Spring Hibernate Introduction

14/28

Once you have created the UI and converted and

validated user inputs,

what next?

8/21/2019 JSF Spring Hibernate Introduction

15/28

The ne2t step is to implement the business logic that

processes the application data.

How can you implement the business logic?

BusinessLogic

8/21/2019 JSF Spring Hibernate Introduction

16/28

I can implement the

business logic by creating

different application

components using theava classes.

8/21/2019 JSF Spring Hibernate Introduction

17/28

The application components developed using the ava

classes are tightly coupled.

onse3uently, change in one component re3uires changing

all the dependent components of the application.

Let us consider an example.

8/21/2019 JSF Spring Hibernate Introduction

18/28

onsider the following code snippetpublic class Order{

...........

private Product prod;

private Customer cust;

public Order(){  //Order class is creating its dependent objects

  cust = new Customer();

prod = new Product();

}

.............

}

Order

Custom

er

Product

Dependenton

Dependenton

8/21/2019 JSF Spring Hibernate Introduction

19/28

If any change is made in the Customer class or the

Product class, the corresponding change needs to be

reflected in the Order class as well.

This re3uires you to recompile the whole code to reflect the

change in the application.

Order

Customer

Product

Dependenton

Dependenton

hanges in

Customer class

or Product class

+esult in changes

being made to the

Order class

8/21/2019 JSF Spring Hibernate Introduction

20/28

How can I create

loosely4coupled application

components?

8/21/2019 JSF Spring Hibernate Introduction

21/28

-ou can create loosely4coupled application components by

using the 5ependency In6ection #5I$ feature of the %pring

framework.

Order

Customer

Product

Injectedinto

Injectedinto

8/21/2019 JSF Spring Hibernate Introduction

22/28

ow that you have developed the UI and created

loosely!coupled application components,

what next?

BusinessLogic

8/21/2019 JSF Spring Hibernate Introduction

23/28

The ne2t step is to implement the logic to store and retrieveapplication data from a database.

How can you implement the logic to

communicate with a database?

BusinessLogic

Database

8/21/2019 JSF Spring Hibernate Introduction

24/28

The logic to communicate

with a database can be

implemented by using

a data access technology,such as 57.

8/21/2019 JSF Spring Hibernate Introduction

25/28

The database communication logic implemented by using adata access technology is database dependent and

re3uires comple2 logic implementation in the business tier.

In addition, if the underlying database changes, the entire

code to communicate with the database needs to be

changed.

CommunicationCode for SQL

RDBMS 1

RDBMS 2

Communicatesit!

Ma" not communicateit!

 #DBC

8/21/2019 JSF Spring Hibernate Introduction

26/28

How can I implement the

database communication logic

that is simple and

database independent?

8/21/2019 JSF Spring Hibernate Introduction

27/28

-ou can implement the database communication logic thatis simple and database independent by using the Hibernate

framework.

CommunicationCode

RDBMS 1

RDBMS 2

Communicatesit!

Communicates it!

$ibernate

8/21/2019 JSF Spring Hibernate Introduction

28/28

Therefore, while developing a Web application, you canuse

%' for the presentation tier.

%pring for creating loosely4coupled components in the

business tier.

Hibernate for communicating with the database tier.

Presentation%ier

Business %ier Database %ier