Session Tracking in servlets
chauhankapil
179 views
10 slides
May 06, 2020
Slide 1 of 10
1
2
3
4
5
6
7
8
9
10
About This Presentation
Explaination of session tracking and its methods
Slide Content
Session Tracking in Servlets
Prof. Neeraj Bhargava
Kapil Chauhan
Department of Computer Science
School of Engineering & Systems Sciences
MDS University, Ajmer
Prof. Neeraj Bhargava
Kapil Chauhan
Department of Computer Science
School of Engineering & Systems Sciences
MDS University, Ajmer
Introduction
Sessionsimply means a particular interval of time.
Session Trackingis a way to maintain state (data) of
an user. It is also known assession managementin
servlet.
Sessionsimply means a particular interval of time.
Session Trackingis a way to maintain state (data) of
an user. It is also known assession managementin
servlet.
Cont..
Http protocol is a stateless so we need to maintain
state using session tracking techniques.
Each time user requests to the server, server treats the
request as the new request.
So we need to maintain the state of an user to
recognize to particular user.
Http protocol is a stateless so we need to maintain
state using session tracking techniques.
Each time user requests to the server, server treats the
request as the new request.
So we need to maintain the state of an user to
recognize to particular user.
Cont..
HTTP is a "stateless" protocol which means each time
a client retrieves a Web page, the client opens a
separate connection to the Web server and the server
automatically does not keep any record of previous
client request.
HTTP is stateless that means each request is
considered as the new request.
HTTP is a "stateless" protocol which means each time
a client retrieves a Web page, the client opens a
separate connection to the Web server and the server
automatically does not keep any record of previous
client request.
HTTP is stateless that means each request is
considered as the new request.
Session Tracking
Session Tracking Techniques
There are four techniques used in Session tracking:
Cookies
Hidden Form Field
URL Rewriting
HttpSession
There are four techniques used in Session tracking:
Cookies
Hidden Form Field
URL Rewriting
HttpSession
Method & Description
public Object getAttribute(String name)
This method returns the object bound with the
specified name in this session, or null if no object is
bound under the name.
public Enumeration getAttributeNames()
This method returns an Enumeration of String objects
containing the names of all the objects bound to this
session.
public Object getAttribute(String name)
This method returns the object bound with the
specified name in this session, or null if no object is
bound under the name.
public Enumeration getAttributeNames()
This method returns an Enumeration of String objects
containing the names of all the objects bound to this
session.
Cont..
public int getMaxInactiveInterval()
This method returns the maximum time interval
(seconds), that the servlet container will keep the
session open between client accesses.
public void invalidate()
This method invalidates this session and unbinds any
objects bound to it.
public boolean isNew(
This method returns true if the client does not yet
know about the session or if the client chooses not to
join the session.
public int getMaxInactiveInterval()
This method returns the maximum time interval
(seconds), that the servlet container will keep the
session open between client accesses.
public void invalidate()
This method invalidates this session and unbinds any
objects bound to it.
public boolean isNew(
This method returns true if the client does not yet
know about the session or if the client chooses not to
join the session.
Example
HttpSession session = request.getSession(false);
try {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.println("<html><body>");
// If you are not in a session -you are not logged in
if (session == null) {
writer.println("<p>You are not logged in</p>");
} else {
writer.println("Thank you, you are already logged in");
writer.println("Here is the data in your session");
Enumeration names = session.getAttributeNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
Object value = session.getAttribute(name);
writer.println("<p>name=" + name + " value=" + value + "</p>");
}
}
HttpSession session = request.getSession(false);
try {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.println("<html><body>");
// If you are not in a session -you are not logged in
if (session == null) {
writer.println("<p>You are not logged in</p>");
} else {
writer.println("Thank you, you are already logged in");
writer.println("Here is the data in your session");
Enumeration names = session.getAttributeNames();
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
Object value = session.getAttribute(name);
writer.println("<p>name=" + name + " value=" + value + "</p>");
}
}
Assignment
Explain Session Tracking in servlet with suitable
example.
Explain Session Tracking in servlet with suitable
example.
Tags
Categories
GeneralDownload
Download Slideshow Get the original presentation fileQuick Actions
Statistics
- Views 179
- Slides 10
- Age 2037 days
Related Slideshows
22
Pray For The Peace Of Jerusalem and You Will Prosper
RodolfoMoralesMarcuc
32 views
26
Don_t_Waste_Your_Life_God.....powerpoint
chalobrido8
33 views
31
VILLASUR_FACTORS_TO_CONSIDER_IN_PLATING_SALAD_10-13.pdf
JaiJai148317
31 views
14
Fertility awareness methods for women in the society
Isaiah47
30 views
35
Chapter 5 Arithmetic Functions Computer Organisation and Architecture
RitikSharma297999
27 views
5
syakira bhasa inggris (1) (1).pptx.......
ourcommunity56
29 views