remulakservlet.java

《Developing Applications with Java and UML》一书的源代码。

package com.jacksonreed;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

/**
* This is the main controller servlet for the Remulak Maintain
* Relationships use case.
* 
* In the Tomcat implemenation, only the Customer Add, Update, Delete
* and inquiry function are implemented.
*
* @author Paul Reed, Jackson-Reed, Inc. <[e-mail]>
* @version 1.0
*/

public class RemulakServlet extends HttpServlet {
    private String url;

    public void init() throws ServletException {
        logIt("RemulakServlet: Init");
        url = "t3://localhost:7001";
    }
    public void destroy() {
    }
    /**
    * Processes a GET request by calling doPost().
    */
    public void doGet(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {
        doPost(request, response);
    }
    /**
     * Performs the action specified by
     * the "action" request parameter.
    */
    public void doPost(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doPost");

        String queryString = request.getQueryString();

        logIt("RemulakServlet: querystring " + queryString);

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

        logIt("RemulakServlet: action " + action.toString());

        // Check which action to do and forward to it
        if ("Customer Inquiry".equals(action)) {
            doRltnCustomerInquiry(request, response);
          }
        else if ("New Customer".equals(action)) {
              logIt("RemulakServlet: switch to rltnCustomerNew ");
              doRltnCustomerNew(request, response);
          }
        else if ("Edit Customer".equals(action)) {
             doRltnCustomerEdit(request, response);
          }
        else if ("Delete Customer".equals(action)) {
             doRltnCustomerDelete(request, response);
          }
        else if ("Add/Update Customer".equals(action)) {
             doRltnCustomerAdd(request, response);
          }
        else if ("Edit Address".equals(action)) {
             doRltnAddressEdit(request, response);
          }
        else if ("Delete Address".equals(action)) {
             doRltnAddressDelete(request, response);
          }
        else if ("Add/Update Address".equals(action)) {
             doRltnAddressAdd(request, response);
          }
        else if ("Add Address".equals(action)) {
             doRltnAddressNew(request, response);
          }
        else {
             response.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED);
        }
     }
     /**
     * This operation represents the relationship inquiry pathway through
     * the Maintain Relationships Use Case
     */
     private void doRltnCustomerInquiry(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doRltnCustomerInquiry");

        String customerNumber = request.getParameter("customerNumber");
        logIt("RemulakServlet: request customer number  " +
              customerNumber.toString());

        if (customerNumber == null) {
                throw new ServletException("Missing customerNumber info");
        }

        UCMaintainRltnshp UCController = new UCMaintainRltnshp();

        // call to method in controller bean
        CustomerValue custVal = UCController.rltnCustomerInquiry(customerNumber);

        logIt("RemulakServlet: First Name " + custVal.getFirstName());

        // set the custVal object into the Servlet Context so JSP's can see it
        request.setAttribute("custVal", custVal);

        // remove the UCMaintainRltnshp Controller
        logIt("Removing the Controller");
        UCController = null;

        // Forward to the JSP page used to actually display the page
        forward("rltnInquiry.jsp", request, response);

    }

     /**
     * This operation represents the setup to add a customer pathway through
     * the Maintain Relationships Use Case
     */
     private void doRltnCustomerNew(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doRltnCustomerNew");

        CustomerValue custVal = new CustomerValue();

        // set an empty custVal object into the Servlet Context
        // so JSP's can see it
        request.setAttribute("custVal", custVal);

        // Forward to the JSP page used to actually display the page
        forward("rltnCustomer.jsp", request, response);

    }
    /**
     * This operation represents the setup to edit a Customer
     * the Maintain Relationships Use Case
     */
     private void doRltnCustomerEdit(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException  {

        logIt("RemulakServlet: doRltnCustomerEdit");

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

        UCMaintainRltnshp UCController = new UCMaintainRltnshp();

        // call to controller method in session bean
        CustomerValue custVal = UCController.rltnCustomerInquiry(customerNumber);

        logIt("RemulakServlet: First Name " + custVal.getFirstName());
        logIt("RemulakServlet: Customer ID " + custVal.getCustomerId());

        // set the custVal object into the Servlet Context so JSP's can see it
        request.setAttribute("custVal", custVal);

        // remove the UCMaintainRltnshp Controller

        logIt("Removing the Controller");
        UCController = null;

        // Forward to the JSP page used to actually display the page
        forward("rltnCustomer.jsp", request, response);
    }
    /**
     * This operation represents the setup to add pathway through
     * the Maintain Relationships Use Case
     */
     private void doRltnCustomerDelete(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doRltnCustomerDelete");

        String custId = request.getParameter("customerId");

        Integer customerId = new Integer(custId);
        logIt("RemulakServlet: customerId is " + customerId);

        UCMaintainRltnshp UCController = new UCMaintainRltnshp();

        // call to controller method in session bean
        UCController.rltnDeleteCustomer(customerId);

        // remove the UCMaintainRltnshp Controller

        logIt("Removing the Controller");
        UCController = null;

        // Send a redirect back to the home page
        response.sendRedirect("http://localhost:8080/RemulakWebApp/rltnEntry.html");
        return;

    }
    /**
     * This operation represents the add and update customer pathways through
     * the Maintain Relationships Use Case
     */
     private void doRltnCustomerAdd(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doRltnCustomerAdd");

        UCMaintainRltnshp UCController = new UCMaintainRltnshp();

        // Set the form values to a CustomerValue object

        CustomerValue custVal = setCustomerValueFromForm(request);

        // call to controller method in session bean to add or update the Customer
        if (request.getParameter("customerId").length() == 0) {
            logIt("RemulakServlet: Were adding");
            UCController.rltnAddCustomer(custVal); //Add
            }
        else {
            UCController.rltnUpdateCustomer(custVal); //Update
            logIt("RemulakServlet: Were updating");
             }

        custVal = UCController.rltnCustomerInquiry(custVal.getCustomerNumber()); //Requery
        logIt("RemulakServlet: doRltnCustomerAdd after controller call");

        UCController = null;

        // set custVal object into the Servlet Context
        // so JSP's can see it
        request.setAttribute("custVal", custVal);

        // Forward to the JSP page used to actually display the newly added
        // Customer using a different JSP file
        forward("rltnInquiry.jsp", request, response);
    }
    /**
     * This operation represents the setup to add pathway through
     * the Maintain Relationships Use Case
     */
     private void doRltnAddressNew(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException, ServletException {

        logIt("RemulakServlet: doRltnAddressNew");