When you are done with a user's session data, you have several options −Remove a particular attribute − You can call the public void removeAttribute(String name) method to delete the value associated with the particular key.Delete the whole session − You can call the public void to invalidate() method to discard an entire session.Setting Session timeout − You can call the public void setMaxInactiveInterval(int interval) method to set the timeout for a session individually.Log the user out − The servers that support servlets 2.4, you can call log out to log the client out of the Web server and invalidate ... Read More

This example describes how to use the HttpSession object to find out the creation time and the last-accessed time for a session. We would associate a new session with the request if one does not already exist.Example Live Demo           Session Tracking                        Session Tracking                                   Session info             Value                       ... Read More

JSP makes use of the servlet provided HttpSession Interface. This interface provides a way to identify a user across.a one-page request orvisit to a website orstore information about that userBy default, JSPs have session tracking enabled and a new HttpSession object is instantiated for each new client automatically. Disabling session tracking requires explicitly turning it off by setting the page directive session attribute to false as follows −The JSP engine exposes the HttpSession object to the JSP author through the implicit session object. Since session object is already provided to the JSP programmer, the programmer can immediately begin storing and ... Read More

HTTP is a "stateless" protocol which means each time a client retrieves a Webpage, the client opens a separate connection to the Web server and the server automatically does not keep any record of previous client request.Maintaining Session Between Web Client And ServerLet us now discuss a few options to maintain the session between the Web Client and the Web Server −CookiesA webserver can assign a unique session ID as a cookie to each web client and for subsequent requests from the client they can be recognized using the received cookie.This may not be an effective way as the browser ... Read More

To delete cookies is very simple. If you want to delete a cookie, then you simply need to follow these three steps −Read an already existing cookie and store it in Cookie object.Set cookie age as zero using the setMaxAge() method to delete an existing cookie.Add this cookie back into the response header.Following example will show you how to delete an existing cookie named "first_name" and when you run main.jsp JSP next time, it will return null value for first_name.Example Live Demo           Reading Cookies                       ... Read More

To read cookies, you need to create an array of javax.servlet.http.Cookie objects by calling the getCookies( ) method of HttpServletRequest. Then cycle through the array, and use getName() and getValue() methods to access each cookie and associated value.Let us now read cookies that were set in the previous example −Example Live Demo           Reading Cookies                        Reading Cookies                 Let us now put the above code in main.jsp file and try to access it. If you set ... Read More

Setting cookies with JSP involves three steps −Step 1: Creating a Cookie objectYou call the Cookie constructor with a cookie name and a cookie value, both of which are strings.Cookie cookie = new Cookie("key", "value");Keep in mind, neither the name nor the value should contain white space or any of the following characters −[ ] ( ) = , " / ? @ : ;Step 2: Setting the maximum ageYou use setMaxAge to specify how long (in seconds) the cookie should be valid. The following code will set up a cookie for 24 hours.cookie.setMaxAge(60*60*24);Step 3: Sending the Cookie into the ... Read More

Cookies are usually set in an HTTP header (although JavaScript can also set a cookie directly on a browser). A JSP that sets a cookie might send headers that look something like this −HTTP/1.1 200 OK Date: Fri, 04 Feb 2000 21:03:38 GMT Server: Apache/1.3.9 (UNIX) PHP/4.0b3 Set-Cookie: name = xyz; expires = Friday, 04-Feb-07 22:03:38 GMT; path = /; domain = tutorialspoint.com Connection: close Content-Type: text/htmlAs you can see, the Set-Cookie header contains a name value pair, a GMT date, a path and a domain. The name and value will be URL encoded. The expires field is an instruction ... Read More

Cookies are text files stored on the client computer and they are kept for various information tracking purposes. JSP transparently supports HTTP cookies using underlying servlet technology.There are three steps involved in identifying and returning users -Server script sends a set of cookies to the browser. For example, name, age, or identification number, etc.Browser stores this information on the local machine for future use.When the next time the browser sends any request to the web server then it sends those cookies information to the server and server uses that information to identify the user or may be for some other ... Read More

Stored procedures are sub routines, segment of SQL statements which are stored in SQL catalog. All the applications that can access Relational databases (Java, Python, PHP etc.), can access these procedures.Stored procedures contain IN and OUT parameters, or both. They may return result sets in case you use SELECT statements, they can return multiple result-sets.ExampleSuppose we have a table named Dispatches in the MySQL database with the following data:+--------------+------------------+------------------+------------------+ | Product_Name | Date_Of_Dispatch | Time_Of_Dispatch | Location         | +--------------+------------------+------------------+------------------+ | KeyBoard     | 1970-01-19       | 08:51:36         | Hyderabad ... Read More