Listing 1:  Key logic for login controller JSP (doLogin.jsp)

<%
String id = request.getParameter("username");
String password = request.getParameter("password");
Login loginCommand = new Login();
loginCommand.setCustomerLogin(id);
loginCommand.setCustomerPassword(password);
String urlString = JSPUtil.getBaseURL(request);
 

Listing 2:  Business logic of Login command (Login.java)

try {
  loginCommand =
    (Login) CommandManager.execute(loginCommand);
  HttpSession session = request.getSession(true);
  session.putValue("customer",
    loginCommand.getCustomer());
  session.putValue("transactionList",
    new Vector());
  response.sendRedirect(urlString +
    "viewBalance.jsp");
} catch (CommandException commandException) {
    response.sendRedirect(urlString +
    "login.jsp?customerID=" + id);
}
%>
 
 

try {
  CustomerHome customerHome = (CustomerHome)
    EntityUtility.lookupHome(CustomerHome.class);
 

  Customer customer = null;
  try {
    customer =
      customerHome.findByLogin(customerLogin);
  } catch(ObjectNotFoundException ex) {
      throw new InvalidLoginException();
  }
  if(!customerPW.equals(customer.getPassword())){
    throw new InvalidPasswordException();
  }
  customerDataBean = customer.getDataBean();
 

} catch(Exception ex) {
   ex.printStackTrace();
   throw ex;
}
 
 

Listing 3:  Excerpts from the Customer EJB (CustomerBean.java)

public void ejbCreate(String login,
                      String password,
                      String name)
  throws RemoteException, CreateException
 

{
   this.login = login;
   this.password = password;
   this.name = name;
}
 

Listing 4:  Key logic for viewBalance.jsp

public CustomerDataBean getDataBean()
       throws RemoteException
{
  CustomerDataBean dataBean =
    new CustomerDataBean(login, password, name);
  return dataBean;
}
 
 

<%
  CustomerDataBean customerInfo =
    (CustomerDataBean)
 

  session.getValue("customer");
  ViewAccounts viewAccts = new ViewAccounts();
  viewAccts.setCustomerID(customerInfo.getID());
  try {
    viewAccts = (ViewAccounts)
      CommandManager.execute(viewAccts);
    Vector accounts = viewAccts.getAccounts();
%>
<!-- NOTE: HTML table setup code deleted -->
<%
    for (int i = 0; i < accounts.size(); i ++) {
      AccountDataBean account =
        (AccountDataBean) accounts.elementAt(i);
      double balance = account.getBalance();
      String formattedBalance =
            currencyFormat.format(balance,
              new StringBuffer(),
              fieldPosition).toString();
%>
    <!-- some formating code deleted -->
    <TR>
    <TD> <%= account.getDescription() %></TD>
    <TD> <%= formattedBalance %></TD>
    </TR>
<%
    }
  } catch (Throwable e) {
    e.printStackTrace();
}
%>
 

Listing 5:  The business logic of the ViewAccounts command (ViewAccounts.java)

try {
  accounts = new Vector();
  AccountHome accountHome = (AccountHome)
    EntityUtility.lookupHome(AccountHome.class);
    Enumeration accountEn =
      accountHome.findAllAccountsForCustomer
          (customerID);
 

    while (accountEn.hasMoreElements()) {
      Account account =
        (Account) accountEn.nextElement();
      accounts.addElement(account.getDataBean());
    }
 

} catch(Exception ex) {
  ex.printStackTrace();
  throw ex;
}
 
 

Listing 6:  Extracts from the Account EJB (AccountBean.java)

public void ejbCreate(double balance,
              String description,
              int customerID)
    throws RemoteException, CreateException
{
  this.canWriteChecks = false;
  this.balance = balance;
  this.description = description;
  this.customerID = customerID;
}
 

public AccountDataBean getDataBean()
    throws RemoteException
{
  AccountDataBean dataBean =
    new AccountDataBean(canWriteChecks,
        balance, description, customerID);
  return dataBean;
}