Java Server Pages - Beginning Java with WebSphere - page 296

14. After the nested ifs , add the following statement:

dispatcher.forward(req, resp);
The RequestDispatcher object's forward method will send the request and response directly to the JSP that
was specified in the if statements. By invoking the JSPs from the servlet, we have taken the browser “out of the loop”
thereby speeding up access to the JSPs.
The EmpServlet source code should look like the following:

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.RequestDispatcher;
public class EmpServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
RequestDispatcher dispatcher;
public EmpServlet(){
super ();
}
protected void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
}
protected void doPost(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
String Function = req.getParameter("functionLB");
if (Function.equals("Display")) {
dispatcher =
getServletContext().getRequestDispatcher("DispEmpInfoJSP.jsp");
} else {
if (Function.equals("Gross")) {
dispatcher =
getServletContext().getRequestDispatcher("DispEmpGrossJSP.jsp");
} else {
if (Function.equals("TaxAmt")) {
dispatcher =
getServletContext().getRequestDispatcher("DispEmpTaxAmtJSP.jsp");
}
}
}
dispatcher.forward(req, resp);
}
}

15. Save the EmpServlet source code.

16. Run c9/EnterEmpInfoForm on the server and verify that all three JSPs are

displayed as expected.