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JSP interview questions

  • How do i include static files within a jsp page ? view answer
  • Image upload from JSP to DataBase ? view answer
  • How to Disable session in JSP page ? view answer
  • Q.How you do Session Management in JSP ? view answer
  • How can get the checked values from multiple check box checked ? or How to Handle multiple check box checked ? view answer
  • Q.How to send email through JSP/Java? view answer
  • Q.How to create and retrive a multiple selections list in jsp/servlet? view answer
  • Q.How to create a drop down list in jsp? view answer
  • Q. How to add and delete Cookie in jsp ? view answer
  • Q. How to Protect JSPs from direct access ? view answer
  • Q.How to upload an image from servlet/jsp into server from clients machine? view answer
  • Q.How do you delete a Cookie within a JSP? view answer
  • Q.How do you prevent the Creation of a Session in a JSP Page and why? view answer
  • Q.How does a servlet communicate with a JSP page? view answer
  • Q.which situation you use static include and dynamic include in jsp? view answer
  • Q.Difference between static include and dynamic include in JSP ? view answer
  • q.What's the Difference between Forward and Include? view answer
  • Q.How do you pass control from one JSP page to another? view answer
  • Q.How can I declare methods within my JSP page? view answer
  • Q.How can I implement a thread-safe JSP page? view answer
  • Q.How does JSP handle run-time exceptions? view answer
  • Q.How do I perform browser redirection from a JSP page? view answer
  • Q.How do I include static files within a JSP page? view answer
  • Q.How many JSP scripting elements and what are they? view answer
  • Q.What are the implicit objects? view answer
  • Q.How does a try statement determine which catch clause should be used to handle an exception? view answer
  • Q.How do I prevent the browser from caching my dynamic content? view answer
  • Q.Explain the life-cycle mehtods in JSP? view answer
  • Q.What are the different scope valiues for the ? view answer
  • What are implicit objects in JSP? view answer
  • What is a Expression,Declaration,Scriptlet in jsp? view answer
  • What is a Visible and Hidden Comment in jsp? view answer
  • Q. What is a Expression? view answer

!!! JSP interview questions !!!

Q.How you do Session Management in JSP ?


SCJP 1.5/1.6 Exam Kit
SCWCD 1.5 Exam Kit

Http protocol is a stateless protocol, that means that it can't persist the data. Http treats each request as a new request so every time you will send a request you will be considered as a new user.

In session management whenever a request comes for any resource, a unique token is generated by the server and transmitted to the client by the response object and stored on the client machine as a cookie. We can also say that the process of managing the state of a web based client is through the use of session IDs. Session IDs are used to uniquely identify a client browser, while the server side processes are used to associate the session ID with a level of access. Thus, once a client has successfully authenticated to the web applicatiion, the session ID can be used as a stored authentication voucher so that the client does not have to retype their login information with each page request. Now whenever a request goes from this client again the ID or token will also be passed through the request object so that the server can understand from where the request is coming.
Session management can be achieved by :

1. Cookies: cookies are small bits of textual information that a web server sends to a browser and that browsers returns the cookie when it visits the same site again. In cookie the information is stored in the form of a name, value pair. By default the cookie is generated. If the user doesn't want to use cookies then it can disable them browser setting.

2. URL rewriting: In URL rewriting we append some extra information on the end of each URL that identifies the session. This URL rewriting can be used where a cookie is disabled. It is a good practice to use URL rewriting. In this session ID information is embedded in the URL, which is recieved by the application through Http GET requests when the client clicks on the links embedded with a page.
Exmaple : http://www.techfaq360.com/answers.jsp?sname=test

3. Hidden form fields: In hidden form fields the html entry will be like this : <input type ="hidden" name ="name" value="">. This means that when you submit the form, the specified name and value will be get included in get or post method. In this session ID information would be embedded within the form as a hidden field and submitted with the Http POST method.

4. HttpSession object :
javax.servlet.http.HttpSession is an interface that provides a way to identify a user across more than one page request or visit to a web site. This is the way mainly used in webapplication. HttpSession object maintain session for you. You don't need to do any session management.

session.setAttribute("name",name);
String name = session.getAttribute("name");
you will get the same value which you have set.


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