Hi,
I am again posting this question in shorter, please help me.
I am having one servlet "Servlet 1" which displays a form, on form submit, it
calls another servlet "Servlet 2" which will do some process and then redirects
to servlet 1 using RequestDispatcher.
1. Before redirecting to servlet 1, servlet 2 should produce html which will
display a popup window.
2. Its perfoming perfectly i.e. it redirects to servlet 1 and display a popup
window. The only thing I am unable to understand is that still the url on
browser is Servlet 2, which I think should be Servlet 1.
3. I can not use "response.sendRedirect()" since my requirement is to
redirect and display a popup window , which will give impression that this
popup winodow is displayed by Servlet 1.
This type of scnerio is required when dealing with multiple websites. Here you
can assume that "Servlet 1" is on one website and "Servlet 2" on another
website.
Also if anyone can provide difference between forward and include.
Thanks in advance.
Sushil
Sushil Singh wrote:
> Hi,
>
> Can anyone help me in understanding the function of RequestDispatcher.
>
> =======================================================================
> First Servlet: RdTest1
> =======================================================================
> import java.io.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
> public class RdTest1 extends HttpServlet
> {
> public void doGet(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> // Creating printerwriter object
> PrintWriter out = res.getWriter();
>
> // Set content type and other response header fields first
> res.setContentType("text/HTML");
>
> // Building page
> out.println("<HTML>");
> out.println("<BODY>");
>
> out.println("<FORM name=\"rdForm\" action=\"/servlet/RdTest2\"
> method=\"post\">");
> out.println("<CENTER><H3>URL Redirection - Request
> Dispatcher</H3></CENTER>");
>
> out.println("<BR><BR><BR><BR><BR>");
> out.println("Content from RdTest1");
> out.println("<BR><BR><BR><BR><BR>");
>
> out.println("<INPUT TYPE=\"SUBMIT\">");
>
> out.println("</FORM>");
> out.println("</BODY>");
> out.println("</HTML>");
> }
>
> public void doPost(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> doGet(req, res);
> }
> }
>
> =======================================================================
> Secound Servlet: RdTest2
> =======================================================================
> import java.io.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
> public class RdTest2 extends HttpServlet
> {
> public void doGet(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> doPost(req, res);
> }
>
> public void doPost(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException
> {
> // Creating printerwriter object
> PrintWriter out = res.getWriter();
>
> // Set content type and other response header fields first
> res.setContentType("text/HTML");
>
> out.println("Content from RdTest2");
>
> //res.sendRedirect("/servlet/UrlRed1");
> RequestDispatcher rd = null;
> rd =
> getServletContext().getRequestDispatcher("/servlet/RdTest1");
> rd.forward(req, res);
>
> }
> }
>
> ======================================================================
> The flow is: First servlet (RdTest1) is called from browser, on pressing
> submit button, it will call secound servlet (RdTest2) which will forward
> that request again to first servlet (RdTest1) using RequestDispather
> service.
>
> The output which I am seeing is merged output of RdTest2 and RdTest1. On
> browser, the url indicates the second servlet:
> http://localhost/servlet/RdTest2
> Here which servlet is having control, RdTest1 or RdTest2? Also if
> anybody can help me understanding the difference between forward and
> include, it will be highly appreciated.
>
> ==========
> OUTPUT
> ==========
> Content from RdTest2
> <HTML>
> <BODY>
> <FORM name="rdForm" action="/servlet/RdTest2" method="post">
> <CENTER><H3>URL Redirection - Request Dispatcher</H3></CENTER>
> <BR><BR><BR><BR><BR>
> Content from RdTest1
> <BR><BR><BR><BR><BR>
> <INPUT TYPE="SUBMIT">
> </FORM>
> </BODY>
> </HTML>
>
> ======================================================================
>
> Thanks in advance.
>
> Sushil
>
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