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Point Of Sale(POS) J2EE Application

Department : Computer Science

Degree : MasterStudent : Woojin Choi

ID : 0426367

(POS J2EE Application with JRun)

< Master Degree ina! "roject #


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Topics

Introduction o$ "%S &pp!ication S'stem re(uirement &pp!ication Map Data)ase Diagram "%S Component "%S Wor*$!o+ using ,2-- Design ./M 1 ,S" 1 Ser!et 1 -, in "%S ,2-- Introduction ,2-- 5 ,2-- &"I "%S &pp!ication +ith ,2--

-nterprise ,aaeans -, "%S Component -amp!e "%S Securit' Mechanism "%S Schedu!er Supp!ementar' Issues


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Introduction of POS

POS : Point of Sale Business topic : Web based application for a customer to check out the

shopping easily and fast Current Process : Customer comes in store -> Put the item to shopping

cart -> Wait to check out -> Clerk help to check out Problem : Customers need to wait for a long time een the item is simple Solution : Put the clerk barcode scanning and checking out systems to

each shopping lane and allow for a customer to check out the carts byhimself

!ew system to sole the problem : POS "#$$ %pplication Benefits : Portable business solution & 'ntegrated e-business & Sae the

customer(s time & )own the store cost


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System Reuirement

Serer side

* Operating System : Win !+ ,. & Win#/

* Web Serer : ''S ,. & 0.

* %pplication Serer : "1un 2.#

* )atabase : 3S S45 Serer 6.

Client side

* Browser : '$,. or higher


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Checkout7sp

Checkout7sp

Products7sp

Products7sp

%dd&$dit&)elete

Shopping list

%dd&$dit&)elete

Shopping list

5ogin7sp

5ogin7sp

Application !ap

&uthenticationSer!et

&uthenticationSer!et

5oginerror7sp

5oginerror7sp

'nde87spDisp!a' shopp!ing cart

'nde87spDisp!a' shopp!ing cart

5ogout7sp

5ogout7sp

Scheduler

Scheduler

Customi8ed -rror "ages

.//" -rror

,run &pp!ication -rror

4039htm!

4049htm!

409htm!

009htm!

oginerror9jsp

Customi8ed -rror "ages

.//" -rror

,run &pp!ication -rror

4039htm!

4049htm!

409htm!

009htm!

oginerror9jsp


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"ata#ase "ia$ram


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POS %omponents

Presentation 5ogic* 9+35

* "SP

* 5ogin7sp customers7sp customer;profile7sp

9++PSere

r=9+35>

TTP

?>

")BC

")BC

$"B

Container

$"B

Container

"1un

TTP on *A-

"


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)efines a standard for deeloping multi-tier applications* @endors collaborate on standards and compete on

implementation

* %ll the pieces of the application are portable across platformsand serers

Simplifies application deelopment

* )eeloper focuses on application logic

* "#$$ serer handles comple8ity of lower leel serices Component

* "SPs & Serlets & $"Bs %P' : Serlet & "SP & $"B & ")BC & "!)' & "aa3ail & "3S & "+%

Ja,a 2 Enterprise Edition (J2EE)


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J2EE APIs

Ser!ets

* Standard &"I etending and enhancing We) serers

,aa Serer "ages ,S"

* Standard &"I $or creating d'namic content using static temp!ates

-nterprise ,aaeans -,* Standard serer;side component mode!

,aa Data)ase Connectiit' ,DC

,aaMai!

,aa aming and Director' Inter$ace ,DI

,aa Message Serice ,MS

,aa /ransaction &"I ,/&

= "%S s'stem : Ser!et 1 ,S" 1 -, 1 ,DI 1 ,DC


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POS Application with J2EE

Proides complete implementation of "#$$* Ser!ets 292

* ,S" >9>

* -, >9>

* ,DI

* ,MS

* ,DC

* ,/&1,/S

* ,aaMai!

POS %pplication* Serlet ##

* "SP AA

* $"B AA

* "!)'

POS %pplication Work low* Presentation : "SP

* 'nterface : Serlet

* Business 5ogic : $"B


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Enterprise Ja,aeans (EJ)

Serer-side component model allowing deelopers toconcentrate on business logic

$"B serer handles comple8ity of lower leel serices

$"B %P' guarantees components to be portable across$"B Serers

* Component life cycle

* State management

* Persistence

* 3ulti-threading

* Connection pooling

* +ransaction management

* Security


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Entity eans

sed to

* 1epresent a business entity =like a row in adatabase table

*Proide standard access and alidation forbusiness entities

Persistent =lie beyond serer lifetime

* sually represent data in a database

$8amples* Customer Product $mployee


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Entity eans

Bean 3anaged Persistence =B3P

* )eeloper writes persistence code

Container 3anaged Persistence =C3P

* $"B properties are mapped to database columns* Persistence code automatically generated by $"B

container

'mplements 7aa8e7b$ntityBean


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Session eans

sed to* 3anage processes and tasks

* 3odel the workflow of $ntity beans

* 1etriee and update data that canDt be adeEuately captured

in an entity bean !o persistent state $8ample

* Order a product

* Check out the shopping cart* 1eseration


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Session eans

Stateful Session Bean* 3aintain a state between method inocations

* Store properties as instance ariables

* $8pose methods to manipulate properties Stateless Session Bean

* )o not retain information between method inocations

* $ach method is completely independent* Client passes needed information as parameters to the method* Participate in instance poolinginstance pooling

* Freatest scalability

* 3any clients share limited number of instances 'mplements 7aa8e7bSessionBean


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ome + Remote Interface

9ome 'nterface

* )efines methods to create =obtain find or remoe

a Bean 'nstance on behalf of the client

* $8tends7aa8e7b$"B9ome 1emote 'nterface

* )efines the beanDs business methods

* $8tends7aa8e7b$"BOb7ect


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Pac'a$in$ the ean in a JAR .ile

Shopping5ist9omeclassShopping5ist9omeclass

Shopping5istclassShopping5istclass

Shopping5ist$"BclassShopping5ist$"Bclass

e7b8mle7b8ml

'ncludes:* Bean class

* 1emote interface

* 9ome 'nterface* )eployment descriptor

=e7b8ml


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"eploy Tool

)eploy +ool=3acromedia /%W% "#$$ deploytool generatesstub classes and ob7ect classes

)eploy +ool uses 7ar file and generates necessary classes for$"B serer

Stub classes* )ownloaded to a client dynamically at run time

* sed by client Ob7ect classes

* 'mplement all corresponding interfaces* sed by $"B serer


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EJ %onceptual Architecture

EJB Server

EJ %lassEJ O#/ect Stu#

Remote Interface

JNDI Server

Initial%onte0t

loo'up(1%ustomer)

EJ ome Stu#

ome Interface

EJ O#/ect

Remote Interface

EJ ome

ome Interface

create+find

$et*ist( )


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"e,elopment Process EJ

Customer9omeclassCustomer9omeclass

CustomerclassCustomerclass

Customer$"BclassCustomer$"Bclass

e7b8mle7b8ml

$"B

)eloper

Dee!oper* .ome Inter$ace

* ?emote Inter$ace

* -, c!ass

* Support c!asses Dep!o'er Dep!o' too!

* "ac*aging Inter$aces@ -, c!ass@ and support c!asses

* Dep!o' the pac*aged -, jar $i!e Serer

* Imp!ement -,

-, Serers


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POS %omponent E0ample

%dd remoe and display a customer shopping list

Inde9jsp

ShoppingistSession

&dd ?emoe

Disp!a'

)isplay all

shopping list

from $"B

orm action to

add & remoe

shopping list

Capture the

Shopping list id

Call bean

method to be fit

with each action

'mplement get

add remoe

shipping list

methods

&ddShoppingist?emoeShoppingist

"

ShoppingCart

/a)!e

Select updatedelete shopping

list from

ShoppingCart

table


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POS Security !echanism

orm Based "1un application security based on "#$$ ser & Froup & 1ole

Protect entire application "SPs & Serlets & $"Bs

G )atabase%thentication7aa to erify user using )B

5ogin7sp5ogin7sp

./M

,S"

Ser!et

-,

%ther ?esources

./M

,S"

Ser!et

-,

%ther ?esources

&uthentication=

Ser!et

&uthentication=

Ser!et

5oginerror7sp5oginerror7sp

POS


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POS Scheduler

"run proides a Scheduler serlet to e8ecute actionsat specified times

Scheduler serlet : allaire7runschedulerCronSerice

)efines the serlet in web8ml %pplication defines Scheduleini for the serice Scheduleini includes the rule and the reEuests to be

scheduled

G 'f this serice is used in application this applicationis not potable because "1un added this serice


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&e#30ml sample for scheduler

?serlet> defines the serice ?&serlet>?serlet>

?serlet-name>POSScheduler?&serlet-name>

?description>Scheduler for POS System?&description>

?init-param>

?&init-param>

?load-on-startup&>

?&serlet>

$8cept those bold tags deeloper can gie any name or file


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Schedule3ini E0ample

Scheduleini is defined in web8ml?init-param>


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Supplementary Issues

Physical Security 3echanism Barcode scanner integration=physical

Credit card process integration=physical

Business data e8change using J35

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