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JSP IN ACTION
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The sections that follow describe each of the action classes used in the product support system
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A review of Figure 19-3 shows seven state transitions occur from one view to another These transitions correspond to the following action classes: I CustomersSearchAction I CustomersListSelectAction I CustomersNewProblemAction I ProductsSearchAction I ProductsListSelectAction I ProblemsSelectAction I ProblemSubmitAction
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CustomersSearchAction Class The run() method in this class is called to accept a customer search argument from the Customersjsp view and invoke the customerSearch() method in the model It then forwards the request to the JSP view page that displays the search results A listing of CustomersSearchAction is shown here:
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package comlyricnotesupportcontroller; import import import import javaio*; javasqlSQLException; javaxservlet*; javaxservlethttp*;
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/** * Searches the database for customers matching the * customer search argument */ public class CustomersSearchAction extends Action { /** * Executes the action */ public void run() throws ServletException, IOException { // Perform search
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Case Study: A Product Support Center
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String arg = requestgetParameter("customerSearchArgument"); if (arg != null) { arg = argtrim(); if (!argequals("")) { try { modelcustomerSearch(arg); } catch (SQLException e) { throw new ServletException(egetMessage()); } } } // Forward to customer list JSP final String next = "/CustomersListjsp"; RequestDispatcher rd = applicationgetRequestDispatcher(next); if (rd == null) throw new ServletException ("Could not find " + next); rdforward(request, response); } }
JSP IN ACTION
CustomersListSelectAction Class The user selects a customer from the list by clicking a hyperlink into the controller that carries the CustomerList view name and the Select action keyword In addition, the hyperlink URL has the customer ID appended as a query string From this information, the CustomersListSelectAction class does the following:
I Extracts the customer ID parameter from the URL and stores it in the model I Invokes the model s customer problems search method I Forwards the request to the customer detail JSP view Here s a listing of the action class:
package comlyricnotesupportcontroller; import javaio*; import javasqlSQLException;
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import javaxservlet*; import javaxservlethttp*; /** * Gets detailed information for this customer */ public class CustomersListSelectAction extends Action { /** * Executes the action */ public void run() throws ServletException, IOException { // Get customer ID and store it in the model String customerID = requestgetParameter("customerID"); if (customerID == null) throw new ServletException ("No customer ID specified"); modelsetCustomerID(customerID); // Get the list of problems for this customer try { modelcustomerProblemsSearch(customerID); } catch (SQLException e) { throw new ServletException(egetMessage()); } // Forward to customer detail JSP final String next = "/Customerjsp"; RequestDispatcher rd = applicationgetRequestDispatcher(next); if (rd == null) throw new ServletException ("Could not find " + next); rdforward(request, response); } }
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Case Study: A Product Support Center
CustomerNewProblemAction Class As noted previously, the Customer view has two possible actions: creating a new problem or updating an existing one The new problem action is handled by the following action class:
package comlyricnotesupportcontroller; import import import import javaio*; javasqlSQLException; javaxservlet*; javaxservlethttp*;
public class CustomerNewProblemAction extends Action { /** * Executes the action */ public void run() throws ServletException, IOException { // Get the customer ID and product ID String customerID = requestgetParameter("customerID"); if (customerID == null) throw new ServletException ("No customer ID"); String productID = requestgetParameter("productID"); if (productID == null) throw new ServletException ("No product ID"); // Create a new problem try { modelsetCustomerID(customerID); modelsetProductID(productID); modelnewProblem(); } catch (SQLException e) { throw new ServletException(egetMessage()); } // Forward to problem detail JSP
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final String next = "/Problemjsp"; RequestDispatcher rd = applicationgetRequestDispatcher(next); if (rd == null) throw new ServletException ("Could not find " + next); rdforward(request, response); } }
This action class does the following: I Retrieves the customerID and productID parameters from the request generated by the view I Creates and initializes a new Problem object It does so by invoking the newProblem() factory method in the model, which assigns a unique problem ID and writes the initial record in the database I Forwards the request to the problem detail view
ProductsSearchAction Class Like the customer search action, the product search action takes a search string from the request and calls a search method in the model, forwarding the request then to the ProductsListjsp view
package comlyricnotesupportcontroller; import import import import javaio*; javasqlSQLException; javaxservlet*; javaxservlethttp*;
/** * Searches the database for products matching the * product search argument */ public class ProductsSearchAction extends Action { /** * Executes the action */ public void run() throws ServletException, IOException {
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