Difference Betwixt Sendredirect() Together With Forward() Inwards Jsp Servlet

Difference betwixt SendRedirect as well as frontwards is i of classical interview questions asked during coffee spider web developer interview. This is non only applicable for servlet but besides for JSP inwards which nosotros tin give the sack purpose frontwards activity or telephone vociferation upwards sendRedirect() method from scriptlet. Before examining departure on frontwards as well as SendRedirect let’s run across what post Redirect method as well as frontwards method does.

SendRedirect ():

This method is declared inwards HttpServletResponse Interface.

Signature: void sendRedirect(String url)

This method is used to redirect customer asking to unopen to other place for farther processing ,the novel place is available on dissimilar server or dissimilar context.our spider web container direct keep this as well as transfer the asking using browser ,and this asking is visible inwards browser equally a novel request. Some fourth dimension this is besides called equally customer side redirect.

Forward():

This method is declared inwards RequestDispatcher Interface.

Signature: forward(ServletRequest request, ServletResponse response)

This method is used to transcend the asking to unopen to other resources for farther processing within the same server, unopen to other resources could hold out whatsoever servlet, jsp page whatsoever variety of file.This procedure is taken tending yesteryear spider web container when nosotros telephone vociferation upwards frontwards method asking is sent to unopen to other resources without the customer existence informed, which resources volition direct keep the asking it has been get upwards on requestDispatcher object which nosotros tin give the sack instruct yesteryear ii ways either using ServletContext or Request. This is besides called server side redirect.

RequestDispatcher rd = request.getRequestDispatcher("pathToResource");
rd.forward(request, response);

RequestDispatcher rd = servletContext.getRequestDispatcher("/pathToResource");
rd.forward(request, response);

Difference betwixt SendRedirect as well as Forward

Now let’s run across unopen to departure betwixt these ii method of servlet API inwards tabular format.

Forward()	SendRediret()
When nosotros purpose frontwards method asking is transfer to other resources within the same server for farther processing.	In instance of sendRedirect asking is transfer to unopen to other resources to dissimilar domain or dissimilar server for futher processing.
In instance of frontwards Web container direct keep all procedure internally as well as customer or browser is non involved.	When you lot purpose SendRedirect container transfers the asking to customer or browser hence url given within the sendRedirect method is visible equally a novel asking to the client.
When frontwards is called on requestdispather object nosotros transcend asking as well as answer object hence our onetime asking object is acquaint on novel resources which is going to procedure our request	In instance of SendRedirect telephone vociferation upwards onetime asking as well as answer object is lost because it’s treated equally novel asking yesteryear the browser.
Visually nosotros are non able to run across the forwarded address, its is transparent	In address bar nosotros are able to run across the novel redirected address it’s non transparent.
Using frontwards () method is faster as well as then post redirect.	SendRedirect is slower because i extra circular trip is required beasue completely novel asking is created as well as onetime asking object is lost.Two browser asking requird.
When nosotros redirect using frontwards as well as nosotros desire to purpose same information inwards novel resources nosotros tin give the sack purpose request.setAttribute () equally nosotros own got asking object available.	But inwards sendRedirect if nosotros desire to purpose nosotros own got to shop the information inwards session or transcend along amongst the URL.

Example of frontwards as well as SendRedirect inwards JSP Servlet:

Any variety of online payment when nosotros purpose merchant site volition redirect us to cyberspace banking site which is completely novel asking it procedure our asking as well as in i lawsuit again redirect to merchant site?

In Banking Application when nosotros produce login usually nosotros purpose frontwards method. In instance of online banking nosotros are asked for username as well as password if it’s a right unopen to some other servlet or resources volition direct keep the asking other wise asking has been forwarded to fault page.

Which i is good?

Its depends upon the scenario that which method is to a greater extent than useful.

If you lot desire command is transfer to novel server or context as well as it is treated equally completely novel task as well as then nosotros become for Send Redirect.

Normally frontwards should hold out used if the performance tin give the sack hold out safely repeated upon a browser reload of the spider web page volition non touching on the result.

SendRedirect as well as frontwards method are nevertheless real useful piece programming or working on whatsoever spider web application projection using servlet jsp. This is nevertheless a pop interview questions hence don’t forget to revise forward as well as sendRedirect earlier appearing for whatsoever chore interview.

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