Difference betwixt SendRedirect together with forwards is i of classical interview questions asked during coffee spider web developer interview. This is non only applicable for servlet but likewise for JSP inward which nosotros tin purpose forwards activeness or telephone weep upward sendRedirect() method from scriptlet. Before examining departure on forwards together with SendRedirect let’s run across what post Redirect method together with forwards method does.
SendRedirect ():
This method is declared inward HttpServletResponse Interface.
This method is used to redirect customer asking to around other place for farther processing ,the novel place is available on unlike server or unlike context.our spider web container grip this together with transfer the asking using browser ,and this asking is visible inward browser every bit a novel request. Some fourth dimension this is likewise called every bit customer side redirect. Forward():
This method is declared inward RequestDispatcher Interface.
Signature: forward(ServletRequest request, ServletResponse response)
This method is used to exceed the asking to around other resources for farther processing within the same server, around other resources could survive whatsoever servlet, jsp page whatsoever variety of file.This procedure is taken assist past times spider web container when nosotros telephone weep upward forwards method asking is sent to around other resources without the customer existence informed, which resources volition grip the asking it has been cite on requestDispatcher object which nosotros tin instruct past times ii ways either using ServletContext or Request. This is likewise called server side redirect.
RequestDispatcher rd = request.getRequestDispatcher("pathToResource");
rd.forward(request, response);
rd.forward(request, response);
Or
RequestDispatcher rd = servletContext.getRequestDispatcher("/pathToResource");
rd.forward(request, response);
rd.forward(request, response);
Difference betwixt SendRedirect together with Forward
Now let’s run across around departure betwixt these ii method of servlet API inward tabular format.
Forward() | SendRediret() |
When nosotros purpose forwards method asking is transfer to other resources within the same server for farther processing. | In example of sendRedirect asking is transfer to around other resources to unlike domain or unlike server for futher processing. |
In example of forwards Web container grip all procedure internally together with customer or browser is non involved. | When you lot purpose SendRedirect container transfers the asking to customer or browser thence url given within the sendRedirect method is visible every bit a novel asking to the client. |
When forwards is called on requestdispather object nosotros exceed asking together with reply object thence our quondam asking object is introduce on novel resources which is going to procedure our request | In example of SendRedirect telephone weep upward quondam asking together with reply object is lost because it’s treated every bit novel asking past times 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 forwards () method is faster thence post redirect. | SendRedirect is slower because i extra circular trip is required beasue completely novel asking is created together with quondam asking object is lost.Two browser asking requird. |
When nosotros redirect using forwards together with nosotros desire to purpose same information inward novel resources nosotros tin purpose request.setAttribute () every bit nosotros own got asking object available. | But inward sendRedirect if nosotros desire to purpose nosotros own got to shop the information inward session or exceed along amongst the URL. |
Example of forwards together with SendRedirect inward JSP Servlet:
Any variety of online payment when nosotros purpose merchant site volition redirect us to internet banking site which is completely novel asking it procedure our asking together with over again redirect to merchant site?
In Banking Application when nosotros produce login commonly nosotros purpose forwards method. In example of online banking nosotros are asked for username together with password if it’s a right around some other servlet or resources volition grip 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 together with it is treated every bit completely novel task thence nosotros instruct for Send Redirect.
Normally forwards should survive used if the functioning tin survive safely repeated upon a browser reload of the spider web page volition non touching the result.
SendRedirect together with forwards method are nevertheless really useful acre programming or working on whatsoever spider web application projection using servlet jsp. This is nevertheless a pop interview questions thence don’t forget to revise forward together with sendRedirect earlier appearing for whatsoever task interview.
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