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The purpose of this module is to explain session tracking using cookies, and to compare a servlet with a JSP to accomplish the same objective.

Table of contents

Preface

This module is one in a collection of modules designed for teaching INEW 2338 Advanced Java (Web) at Austin Community College in Austin, TX. The purpose of this module is to explainsession tracking using cookies, and to compare a servlet with a JSP to accomplish the same objective.

If you haven't already done so, I strongly recommend that you study Java4370: Cookies with JSP before continuing with this module. Dr. Martinez explains many aspects ofcookies in that module. Most of those aspects apply to both JSP and servlets and many of them won't be repeated in this module.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figures and Listings while you are reading about them.

Figures

  • Figure 1 . Output from the servlet program.
  • Figure 2 . Output from the JSP program.
  • Figure 3 . Description of the Cookie constructor.

Listings

  • Listing 1 . Beginning of the doGet method.
  • Listing 2 . Construct a unique session ID.
  • Listing 3 . Get all of the cookies into an array of type Cookie.
  • Listing 4 . Get and save submitted value.
  • Listing 5 . Create a new session ID cookie.
  • Listing 6 . Create, name, and populate a new Cookie object.
  • Listing 7 . Familiar code.
  • Listing 8 . Get and display cookie names and values.
  • Listing 9 . Display currently submitted field value.
  • Listing 10 . The servlet program named Java4570a.java.
  • Listing 11 . The JSP program named Java4570b.jsp.

General background information

Program output

I will explain a servlet program and present a comparable JSP program in this module. The purpose is to show you how to write servlets that use cookies for sessiontracking and to make it possible to compare a servlet and a JSP that both achieve the same objective.

The servlet output

Figure 1 shows the output produced by requesting the servlet from the localhost server using the Chrome browser and then submitting the names Tom,Dick, and Harry using the input text field and the submit button. I will refer back to this Figure later while explaining the servlet code.

Figure 1 - Output from the servlet program.

Missing Figure

The JSP output

Figure 2 shows the output produced by requesting the JSP from the localhost server using the Firefox browser and then submitting the names Tom,Dick, and Harry using the input text field and the submit button. I will refer back to this Figure later while explaining the JSP code.

Figure 2 - Output from the JSP program.

Missing Figure

(The main difference between Figure 1 and Figure 2 is the line that begins with JSESSIONID in Figure 2 . Also Figure 1 is displayed in a Chrome browser and Figure 2 is displayed in a Firefox browser.)

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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