The difference is an extra trip to the browser.
res.sendRedirect does a redirect thru the browser (using the Location: HTTP
header).
RequestDispatcher.forward directly calls the doGet method of the requested
servlet.
So, RequestDispatcher is more efficient.
Rick L Sample wrote:
> What is the difference between using:
>
> ...
> if (session == null) {
> res.sendRedirect("http://localhost:8080/error.html");
> }
> ...
>
> as opposed to:
>
> ...
> String url="/jsp/shopping/EShop.jsp";
> ServletContext sc = getServletContext();
> RequestDispatcher rd = sc.getRequestDispatcher(url);
> rd.forward(req, res);
> ...
>
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