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/**
get the possible origins form the Origin table
@return Vector with the possible origins
**/
public Vector getOriginList();
/**
gets the destinations from the Destination table
@return Vector with the possible destinations
**/
public Vector getDestinationsForOrigin(String origin);
/**
get the price for the journey from the destination table
@return an integer with the amount
public int getJourneyPrice(String origin, String destination);
/**
Set the configuration for the service. The method is used for external
configuration of the service.
The new configuration information is used to
update our current configuration, and that new current configuration is saved
via the ConfigurationAdmin service
@param props The new configuration properties
*/
public void setConfig(java.util.Dictionary config );
/**
Return a copy of our current configuration
@return Dictionary A copy of our current configuration values
*/
public Dictionary getConfig();
13.4.3 Create the servlet
The heart of the application is the TicketingServlet, which controls the application
flow and drives the interaction between the application and the user (in this case
a train conductor). Within the ITSO Railways Ticketing Web Application project
open the JavaSource and then open and select the
com.ibm.itsorailways.client.gui.servlet package we already created. From the
Toolbar menu select File → New → Other. In the New wizard select Web in the
left window and Servlet in the right window. Give the new servlet the name
TicketingServlet and click Finish.
The doRequest() method provides the control flow for the application. Each user
request is a parameter, which is put into the string named action. The action is
used to inform the servlet of the user’s response to the screen previously
displayed. The possible action values are:
򐂰 SelectOrigin
򐂰 SelectDestination
򐂰 PurchaseTickets
Chapter 13. Using Workplace Client Technology, Micro Edition
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