Difference Betwixt Sendredirect() As Well As Forward() Inwards Jsp Servlet
Difference betwixt SendRedirect too forrad is i of classical interview questions asked during coffee spider web developer interview. This is non merely applicable for servlet but equally good for JSP inwards which nosotros tin purpose forrad activity or telephone call upward sendRedirect() method from scriptlet. Before examining deviation on forrad too SendRedirect let’s run across what post Redirect method too forrad method does.
SendRedirect ():
This method is declared inwards HttpServletResponse Interface.
This method is used to redirect customer asking to merely about other place for farther processing ,the novel place is available on dissimilar server or dissimilar context.our spider web container grip this too transfer the asking using browser ,and this asking is visible inwards browser equally a novel request. Some fourth dimension this is equally good called equally customer side redirect. Forward():
This method is declared inwards RequestDispatcher Interface.
Signature: forward(ServletRequest request, ServletResponse response)
This method is used to move past times the asking to merely about other resources for farther processing within the same server, merely about other resources could endure whatever servlet, jsp page whatever form of file.This procedure is taken tending past times spider web container when nosotros telephone call upward forrad method asking is sent to merely about other resources without the customer beingness informed, which resources volition grip the asking it has been call on requestDispatcher object which nosotros tin larn past times ii ways either using ServletContext or Request. This is equally good 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 too Forward
Now let’s run across merely about deviation betwixt these ii method of servlet API inwards tabular format.
Forward() | SendRediret() |
When nosotros purpose forrad method asking is transfer to other resources within the same server for farther processing. | In example of sendRedirect asking is transfer to merely about other resources to dissimilar domain or dissimilar server for futher processing. |
In example of forrad Web container grip all procedure internally too customer or browser is non involved. | When yous purpose SendRedirect container transfers the asking to customer or browser thus url given within the sendRedirect method is visible equally a novel asking to the client. |
When forrad is called on requestdispather object nosotros move past times asking too reply object thus our quondam asking object is introduce on novel resources which is going to procedure our request | In example of SendRedirect telephone call upward quondam asking too reply object is lost because it’s treated equally 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 forrad () method is faster thus post redirect. | SendRedirect is slower because i extra circular trip is required beasue completely novel asking is created too quondam asking object is lost.Two browser asking requird. |
When nosotros redirect using forrad too nosotros desire to purpose same information inwards novel resources nosotros tin purpose request.setAttribute () equally nosotros possess got asking object available. | But inwards sendRedirect if nosotros desire to purpose nosotros possess got to shop the information inwards session or move past times along amongst the URL. |
Example of forrad too SendRedirect inwards JSP Servlet:
Any form of online payment when nosotros purpose merchant site volition redirect us to internet banking site which is completely novel asking it procedure our asking too over again redirect to merchant site?
In Banking Application when nosotros create login usually nosotros purpose forrad method. In example of online banking nosotros are asked for username too password if it’s a right merely about 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 yous desire command is transfer to novel server or context too it is treated equally completely novel task thus nosotros larn for Send Redirect.
Normally forrad should endure used if the performance tin endure safely repeated upon a browser reload of the spider web page volition non send on the result.
SendRedirect too forrad method are withal rattling useful land programming or working on whatever spider web application projection using servlet jsp. This is withal a pop interview questions thus don’t forget to revise forward too sendRedirect earlier appearing for whatever task interview.
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