my Presentation on JSP and servlet

8/7/2019 my Presentation on JSP and servlet

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Web application

Web application component

Presentation logicApplication or business logic

Data access logic


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One tier architecture:In this code related topresentation, business and database logic areall clubbed together.

Two tier architecture:The code related to dataaccess logic is separated from the othercomponent.and any interaction with datathrough business tier.

Three tier architecture:In this coder

elated to allthree components is separated from each other.However , now business tier acts as interfacebetween data tier and presentation tier can notdirectly communicate with the tier.


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Basic servlet:A servlet is a program written

in java, which runs on server ,processes the

requested information and sends to theclient.

Life cycle of servlet

init()service()

destroy()

Servlet hierarchy


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Servlet hierarchy


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Servlet lifecycle

Init()

Service()

Destroy()


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Session tracking :session tracking allow the

server to keep a track of successive request

made by the same client. Session tracking technique

user authorization

hidden fr

om fieldURL rewriting

cookies

Servlet context


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JSP:java server page is an exciting new

technology that provide powerful and

efficient creation of dynamic content.JSP is apresentation layer technology that allows

static web content to be mixed with javacode.


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Advantage ofJSP VersusASP: better language for dynamic part,

portable Versus PHP: better language for dynamic part

Versus pure servlets: more convenient to create

HTML

VersusSSI: much more flexible and powerful Versus JavaScript: server-side, richer language

Versus static HTML: dynamic features


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JSP life cycle Translation

Compilation

Execution


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JSP

containing java code embedded directly into an

HTML tags page by using special tags.Automatically incorporates change made to my files.

servlet

consist of an HTML file for static content and the javafor dynamic content.

Require recompilation if changes are made to any ofthe file.


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JSPScripting Element Expression

SriptletsDeclaration

JSPDirectives page

Includetaglib


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Input andoutput objects

Request

ResponseOut

Scope communication objects

Session

Application

Page context


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Servlet objects

Page

Config Error objects

Exception


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A Javabean is a special type of class that has anumber of methods. The JSP page can call

these methods so can leave most of the code inthese Javabeans.

Javabean could be used in another page

(promoting reuse).


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A JSP page can call java Bean method using

JSP standard action.JSP standard action are

performed when the browserrequest a JSPpage. these action can be used to include files

or content of another page.


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There are basic five types ofJSP standard

action


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JSP expression language can be used to

display the generated dynamic content in a

table on a web page. Expression language is aprimary feature of the JSP technology.The

syntax forJSP expression language is:$ {EL expression}


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A custom tag is a user-defined JSP language element. When a

JSP page containing a custom tag is translated into a

servlet, the tag is converted to operations on an object

called a tag handler. The Web container then invokes thoseoperations when the JSP page's servlet is executed.

Custom tags have a rich set of features. They can

Be customized via attributes passed from the calling page.

Access all the objects available to JSP pages.

Modify the response generated by the calling page.


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THANK YOU

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my Presentation on JSP and servlet