ch14.htm

corba比较入门级的介绍详细间接了corba访问发布各种细节。

<TT>459:         statusTextField = new java.awt.TextField();</TT>
<TT>460:         statusTextField.setEditable(false);</TT>
<TT>461:         statusTextField.setText(&quot;BankApplet Ready.&quot;);</TT>
<TT>462:         statusTextField.setBounds(2, 302, 400, 23);</TT>
<TT>463:         gbc = new GridBagConstraints();</TT>
<TT>464:         gbc.gridx = 0;</TT>
<TT>465:         gbc.gridy = 5;</TT>
<TT>466:         gbc.gridwidth = 4;</TT>
<TT>467:         gbc.weightx = 1.0;</TT>
<TT>468:         gbc.anchor = GridBagConstraints.SOUTH;</TT>
<TT>469:         gbc.fill = GridBagConstraints.HORIZONTAL;</TT>
<TT>470:         gbc.insets = new Insets(2, 2, 2, 2);</TT>
<TT>471:         ((GridBagLayout)getLayout()).</TT>
<TT>472:                 setConstraints(statusTextField, gbc);</TT>
<TT>473:         add(statusTextField);</TT>
<TT>474:         //}}</TT>
<TT>475: </TT>
<TT>476:         //{{REGISTER_LISTENERS</TT>
<TT>477:         SymAction lSymAction = new SymAction();</TT>
<TT>478:         newCustomerButton.addActionListener(lSymAction);</TT>
<TT>479:         newAccountButton.addActionListener(lSymAction);</TT>
<TT>480:         SymItem lSymItem = new SymItem();</TT>
<TT>481:         bankChoice.addItemListener(lSymItem);</TT>
<TT>482:         atmChoice.addItemListener(lSymItem);</TT>
<TT>483:         customerChoice.addItemListener(lSymItem);</TT>
<TT>484:         accountChoice.addItemListener(lSymItem);</TT>
<TT>485:         autoUpdateButton.addActionListener(lSymAction);</TT>
<TT>486:         depositButton.addActionListener(lSymAction);</TT>
<TT>487:         withdrawButton.addActionListener(lSymAction);</TT>
<TT>488:         updateAccountButton.addActionListener(lSymAction);</TT>
<TT>489:         //}}</TT>
<TT>490: </TT>
<TT>491:         // Initialize the ORB and BOA.</TT>
<TT>492:         myORB = ORB.init(this);</TT>
<TT>493:         myBOA = myORB.BOA_init();</TT>
<TT>494: </TT>
<TT>495:         // Locate a BankServer object and try to get a list of</TT>
<TT>496:         // Banks and ATMs from it.</TT>
<TT>497:         setStatus(&quot;Binding to a BankServer...&quot;);</TT>
<TT>498:         try {</TT>
<TT>499:             myBankServer = BankServerHelper.bind(myORB);</TT>
<TT>500:         } catch (Exception ex) {</TT>
<TT>501: </TT>
<TT>502:             // The bind attempt failed...</TT>
<TT>503:             setStatus(&quot;Unable to bind to a BankServer.&quot;);</TT>
<TT>504:             System.out.println(ex);</TT>
<TT>505:             return;</TT>
<TT>506:         }</TT>
<TT>507:         setStatus(&quot;Successfully bound to a BankServer.&quot;);</TT>
<TT>508: </TT>
<TT>509:         // Get lists of Banks and ATMs from the BankServer.</TT>
<TT>510:         ATM[] atms;</TT>
<TT>511:         Bank[] banks;</TT>
<TT>512:         setStatus(&quot;Getting list of available Banks...&quot;);</TT>
<TT>513:         try {</TT>
<TT>514:             banks = myBankServer.getBanks();</TT>
<TT>515:         } catch (Exception ex) {</TT>
<TT>516: </TT>
<TT>517:             // The attempt failed...</TT>
<TT>518:             setStatus(&quot;Unable to get list of Banks.&quot;);</TT>
<TT>519:             return;</TT>
<TT>520:         }</TT>
<TT>521:         setStatus(&quot;Getting list of available ATMs...&quot;);</TT>
<TT>522:         try {</TT>
<TT>523:             atms = myBankServer.getATMs();</TT>
<TT>524:         } catch (Exception ex) {</TT>
<TT>525: </TT>
<TT>526:             // The attempt failed...</TT>
<TT>527:             setStatus(&quot;Unable to get list of ATMs.&quot;);</TT>
<TT>528:             return;</TT>
<TT>529:         }</TT>
<TT>530:         addBanks(banks);</TT>
<TT>531:         addATMs(atms);</TT>
<TT>532:         setStatus(null);</TT>
<TT>533:     }</TT>
<TT>534: </TT>
<TT>535:     //{{DECLARE_CONTROLS</TT>
<TT>536:     java.awt.Choice bankChoice;</TT>
<TT>537:     java.awt.Choice atmChoice;</TT>
<TT>538:     java.awt.Choice customerChoice;</TT>
<TT>539:     java.awt.Button newCustomerButton;</TT>
<TT>540:     java.awt.Choice accountChoice;</TT>
<TT>541:     java.awt.Button newAccountButton;</TT>
<TT>542:     java.awt.Button autoUpdateButton;</TT>
<TT>543:     java.awt.Label selectBankLabel;</TT>
<TT>544:     java.awt.Label selectATMLabel;</TT>
<TT>545:     java.awt.Label selectCustomerLabel;</TT>
<TT>546:     java.awt.Label selectAccountLabel;</TT>
<TT>547:     java.awt.Panel accountActionPanel;</TT>
<TT>548:     java.awt.Panel accountInfoPanel;</TT>
<TT>549:     java.awt.TextField issuingBankTextField;</TT>
<TT>550:     java.awt.TextField accountNumberTextField;</TT>
<TT>551:     java.awt.TextField accountTypeTextField;</TT>
<TT>552:     java.awt.TextField creationDateTextField;</TT>
<TT>553:     java.awt.TextField currentBalanceTextField;</TT>
<TT>554:     java.awt.Label accountInfoLabel;</TT>
<TT>555:     java.awt.Label issuingBankLabel;</TT>
<TT>556:     java.awt.Label accountNumberLabel;</TT>
<TT>557:     java.awt.Label accountTypeLabel;</TT>
<TT>558:     java.awt.Label creationDateLabel;</TT>
<TT>559:     java.awt.Label currentBalanceLabel;</TT>
<TT>560:     java.awt.Label dollarLabel1;</TT>
<TT>561:     java.awt.Panel transactionsPanel;</TT>
<TT>562:     java.awt.TextField transactionTextField;</TT>
<TT>563:     java.awt.Button depositButton;</TT>
<TT>564:     java.awt.Button withdrawButton;</TT>
<TT>565:     java.awt.Button updateAccountButton;</TT>
<TT>566:     java.awt.Label transactionsLabel;</TT>
<TT>567:     java.awt.Label dollarLabel2;</TT>
<TT>568:     java.awt.TextField statusTextField;</TT>
<TT>569:     //}}</TT>
<TT>570: </TT>
<TT>571:     /**</TT>
<TT>572:      * Set the status bar message to the given string. If the</TT>
<TT>573:      * string is null, the status message is reset to the default.</TT>
<TT>574:      */</TT>
<TT>575:     public void setStatus(String status) {</TT>
<TT>576: </TT>
<TT>577:         if (status != null) {</TT>
<TT>578:             statusTextField.setText(status);</TT>
<TT>579:         } else {</TT>
<TT>580:             statusTextField.setText(&quot;BankApplet ready.&quot;);</TT>
<TT>581:         }</TT>
<TT>582:     }</TT>
<TT>583: </TT>
<TT>584:     /**</TT>
<TT>585:      * Update the given Account with the new balance.</TT>
<TT>586:      */</TT>
<TT>587:     public void update(Account account, float balance) {</TT>
<TT>588: </TT>
<TT>589:         setStatus(&quot;Received AutoUpdate for Account \&quot;&quot; + ((Bank)</TT>
<TT>590:                 myAccountBankMap.get(mySelectedAccount)).name() +</TT>
<TT>591:                 &quot;:&quot; + account.accountNumber() + &quot;\&quot;&quot;);</TT>
<TT>592: </TT>
<TT>593:         // If the updated Account is currently selected, update the</TT>
<TT>594:         // display immediately.</TT>
<TT>595:         if (account._is_equivalent(mySelectedAccount)) {</TT>
<TT>596:             currentBalanceTextField.setText(String.</TT>
<TT>597:                     valueOf(balance));</TT>
<TT>598:         }</TT>
<TT>599:     }</TT>
<TT>600: </TT>
<TT>601:     /**</TT>
<TT>602:      * Add the given array of Banks to the Bank choice box and to</TT>
<TT>603:      * this BankApplet's internal data structures.</TT>
<TT>604:      */</TT>
<TT>605:     protected void addBanks(Bank[] banks) {</TT>
<TT>606: </TT>
<TT>607:         for (int i = 0; i &lt; banks.length; i++) {</TT>
<TT>608:             String name = banks[i].name();</TT>
<TT>609:             myBanks.put(name, banks[i]);</TT>
<TT>610:             bankChoice.add(name);</TT>
<TT>611:         }</TT>
<TT>612:         if (mySelectedBank == null &amp;&amp; banks.length &gt; 0) {</TT>
<TT>613:             mySelectedBank = banks[0];</TT>
<TT>614:         }</TT>
<TT>615:     }</TT>
<TT>616: </TT>
<TT>617:     /**</TT>
<TT>618:      * Add the given array of ATMs to the ATM choice box and to</TT>
<TT>619:      * this BankApplet's internal data structures.</TT>
<TT>620:      */</TT>
<TT>621:     protected void addATMs(ATM[] atms) {</TT>
<TT>622: </TT>
<TT>623:         for (int i = 0; i &lt; atms.length; i++) {</TT>
<TT>624:             String name = atms[i].name();</TT>
<TT>625:             myATMs.put(name, atms[i]);</TT>
<TT>626:             atmChoice.add(name);</TT>
<TT>627:         }</TT>
<TT>628:         if (mySelectedATM == null &amp;&amp; atms.length &gt; 0) {</TT>
<TT>629:             mySelectedATM = atms[0];</TT>
<TT>630:         }</TT>
<TT>631:     }</TT>
<TT>632: </TT>
<TT>633:     /**</TT>
<TT>634:      * Create a new Customer with the given name, Social Security</TT>
<TT>635:      * number, address, mother's maiden name, and PIN.</TT>
<TT>636:      */</TT>
<TT>637:     protected void createCustomer(String name, String</TT>
<TT>638:             socialSecurityNumber, String address, String</TT>
<TT>639:             mothersMaidenName) {</TT>
<TT>640: </TT>
<TT>641:         // Create a new Customer and register it with the BOA.</TT>
<TT>642:         setStatus(&quot;Creating new Customer...&quot;);</TT>
<TT>643:         CustomerImpl customer = new CustomerImpl(name,</TT>
<TT>644:                 socialSecurityNumber, address, mothersMaidenName,</TT>
<TT>645:                 this);</TT>
<TT>646:         myBOA.obj_is_ready(customer);</TT>
<TT>647:         myCustomers.put(name, customer);</TT>
<TT>648:         customerChoice.add(name);</TT>
<TT>649:         if (mySelectedCustomer == null) {</TT>
<TT>650:             mySelectedCustomer = customer;</TT>
<TT>651:         }</TT>
<TT>652: </TT>
<TT>653:         // Now that there is a Customer selected, the Account</TT>
<TT>654:         // operations can be enabled.</TT>
<TT>655:         accountChoice.setEnabled(true);</TT>
<TT>656:         newAccountButton.setEnabled(true);</TT>
<TT>657: </TT>
<TT>658:         setStatus(null);</TT>
<TT>659:     }</TT>
<TT>660: </TT>
<TT>661:     /**</TT>
<TT>662:      * Create a new Account with the given owner, Account type, and</TT>
<TT>663:      * initial balance.</TT>
<TT>664:      */</TT>
<TT>665:     protected void createAccount(Customer owner, String type, float</TT>
<TT>666:             initialBalance) {</TT>
<TT>667: </TT>
<TT>668:         setStatus(&quot;Creating new Account...&quot;);</TT>
<TT>669:         Account account = mySelectedBank.createAccount(owner, type,</TT>
<TT>670:                 initialBalance);</TT>
<TT>671:         Hashtable accounts = (Hashtable)myAccounts.</TT>
<TT>672:                 get(mySelectedCustomer);</TT>
<TT>673: </TT>
<TT>674:         // If there doesn't exist an index of Accounts for this</TT>
<TT>675:         // Customer already, create one.</TT>
<TT>676:         if (accounts == null) {</TT>
<TT>677:             accounts = new Hashtable();</TT>
<TT>678:             myAccounts.put(mySelectedCustomer, accounts);</TT>
<TT>679:         }</TT>
<TT>680:         String accountName = mySelectedBank.name() + &quot;:&quot; + account.</TT>
<TT>681:                 accountNumber();</TT>
<TT>682:         accounts.put(accountName, account);</TT>
<TT>683:         accountChoice.add(accountName);</TT>
<TT>684:         myAccountBankMap.put(account, mySelectedBank);</TT>
<TT>685: </TT>
<TT>686:         if (mySelectedAccount == null) {</TT>
<TT>687:             mySelectedAccount = account;</TT>
<TT>688:         }</TT>
<TT>689: </TT>
<TT>690:         // Now that there is an Account selected, the Account</TT>
<TT>691:         // features can be enabled. Also update the Account info</TT>
<TT>692:         // display.</TT>
<TT>693:         enableAccountFeatures(true);</TT>
<TT>694:         updateAccountInfo();</TT>
<TT>695: </TT>
<TT>696:         setStatus(null);</TT>
<TT>697:     }</TT>
<TT>698: </TT>
<TT>699:     /**</TT>
<TT>700:      * Enable/disable the Account-related features.</TT>
<TT>701:      */</TT>
<TT>702:     protected void enableAccountFeatures(boolean enable) {</TT>
<TT>703: </TT>
<TT>704:         autoUpdateButton.enable(enable);</TT>
<TT>705:         transactionTextField.enable(enable);</TT>
<TT>706:         depositButton.enable(enable);</TT>
<TT>707:         withdrawButton.enable(enable);</TT>
<TT>708:         updateAccountButton.enable(enable);</TT>
<TT>709:         if (!enable) {</TT>
<TT>710:             issuingBankTextField.setText(&quot;&quot;);</TT>
<TT>711:             accountNumberTextField.setText(&quot;&quot;);</TT>
<TT>712:             accountTypeTextField.setText(&quot;&quot;);</TT>
<TT>713:             creationDateTextField.setText(&quot;&quot;);</TT>