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15.2 Example: An On Line Travel Agent

363

Listing 15.3 Travel.java 

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

/** Top level travel processing servlet. This servlet sets up

 *  the customer data as a bean, then forwards the request

 *  to the airline booking page, the rental car reservation

 *  page, the hotel page, the existing account modification

 *  page, or the new account page.

 */

public class Travel extends HttpServlet {

  private TravelCustomer[] travelData;

  public void init() {

    travelData = TravelData.getTravelData();

  }

  /** Since password is being sent, use POST only. However,

   *  the use of POST means that you cannot forward

   *  the request to a static HTML page, since the forwarded

   *  request uses the same request method as the original

   *  one, and static pages cannot handle POST. Solution:

   *  have the "static" page be a JSP file that contains

   *  HTML only. That's what accounts.jsp is. The other

   *  JSP files really need to be dynamically generated,

   *  since they make use of the customer data.

   */

  public void doPost(HttpServletRequest request,

                     HttpServletResponse response)

      throws ServletException, IOException {

    String emailAddress = request.getParameter("emailAddress");

    String password = request.getParameter("password");

    TravelCustomer customer =

      TravelCustomer.findCustomer(emailAddress, travelData);

    if ((customer == null) || (password == null) ||

        (!password.equals(customer.getPassword()))) {

      gotoPage("/travel/accounts.jsp", request, response);

    }

    // The methods that use the following parameters will

    // check for missing or malformed values.

    customer.setStartDate(request.getParameter("startDate"));

    customer.setEndDate(request.getParameter("endDate"));

    customer.setOrigin(request.getParameter("origin"));

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

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