A major practical difference is its use: in security scenario where we always needed a new session, we should use request. Cewein 2 2 silver badges 13 13 bronze badges. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Visit chat. Linked Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled.
Accept all cookies Customize settings. What did you get? I thought some brilliant mind would explain to me.. Thanks anyway, Philip. String and getSession Boolean b method is return the current session if its set in request and if there is no session the its returns new session.
The getAttribute methods return the object associate with this session. And now what you want to ask clearfy? An object of HttpSession can be used to perform two tasks:.
In this example, we are setting the attribute in the session scope in one servlet and getting that value from the session scope in another servlet. To set the attribute in the session scope, we have used the setAttribute method of HttpSession interface and to get the attribute, we have used the getAttribute method.
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Please mail your requirement at [email protected] Duration: 1 week to 2 week. Servlet Tutorial. War File welcome-file-list Load on startup. Servlet Collaboration. RequestDispacher sendRedirect. Servlet Advance Session Tracking. Next Topic Servlet HttpSession login and logout example. If there are multiple headers with the same name, this method returns the first head in the request. You can use this method with any request header.
Parameters: name - a String specifying the header name Returns: a String containing the value of the requested header, or null if the request does not have a header of that name getHeaders java.
Some headers, such as Accept-Language can be sent by clients as several headers each with a different value rather than sending the header as a comma separated list. If the request did not include any headers of the specified name, this method returns an empty Enumeration.
Parameters: name - a String specifying the header name Returns: an Enumeration containing the values of the requested header. If the request does not have any headers of that name return an empty enumeration. If the container does not allow access to header information, return null getHeaderNames java. If the request has no headers, this method returns an empty enumeration.
Some servlet containers do not allow servlets to access headers using this method, in which case this method returns null Returns: an enumeration of all the header names sent with this request; if the request has no headers, an empty enumeration; if the servlet container does not allow servlets to use this method, null getIntHeader int getIntHeader java. If the request does not have a header of the specified name, this method returns If the header cannot be converted to an integer, this method throws a NumberFormatException.
Parameters: name - a String specifying the name of a request header Returns: an integer expressing the value of the request header or -1 if the request doesn't have a header of this name Throws: java. NumberFormatException - If the header value can't be converted to an int getMethod java. Returns: a String specifying the name of the method with which this request was made getPathInfo java. This method returns null if there was no extra path information.
Returns: a String , decoded by the web container, specifying extra path information that comes after the servlet path but before the query string in the request URL; or null if the URL does not have any extra path information getPathTranslated java.
If the URL does not have any extra path information, this method returns null or the servlet container cannot translate the virtual path to a real path for any reason such as when the web application is executed from an archive.
The web container does not decode this string. Returns: a String specifying the real path, or null if the URL does not have any extra path information getContextPath java. The context path always comes first in a request URI. For servlets in the default root context, this method returns "". The container does not decode this string. It is possible that a servlet container may match a context by more than one context path.
In such cases this method will return the actual context path used by the request and it may differ from the path returned by the ServletContext. The context path returned by ServletContext.
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