visual basic 6.0 barcode generator The actionConnect( ) Method in Java

Drawing PDF417 in Java The actionConnect( ) Method

The actionConnect( ) Method
PDF-417 2d Barcode Decoder In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Create PDF417 In Java
Using Barcode printer for Java Control to generate, create PDF417 image in Java applications.
The actionConnect( ) method, shown here, is used to validate that all of the connection settings have been entered and to dispose the dialog box when the Connect button is clicked, removing it from the screen:
PDF417 Reader In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Barcode Creator In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
// Validate connection settings and close dialog box. private void actionConnect() { if (serverTextField.getText().trim().length() < 1 || usernameTextField.getText().trim().length() < 1 || passwordField.getPassword().length < 1 || smtpServerTextField.getText().trim().length() < 1) { JOptionPane.showMessageDialog(this, "One or more settings is missing.",
Decoding Barcode In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
PDF-417 2d Barcode Creation In Visual C#
Using Barcode creator for VS .NET Control to generate, create PDF 417 image in VS .NET applications.
The Art of Java
Generate PDF 417 In .NET
Using Barcode generator for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
PDF 417 Maker In Visual Studio .NET
Using Barcode printer for Visual Studio .NET Control to generate, create PDF417 image in VS .NET applications.
"Missing Setting(s)", JOptionPane.ERROR_MESSAGE); return; } // Close dialog box. dispose(); }
PDF-417 2d Barcode Maker In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create PDF417 image in .NET framework applications.
Data Matrix 2d Barcode Creator In Java
Using Barcode printer for Java Control to generate, create Data Matrix ECC200 image in Java applications.
Since each of the Connect dialog box s settings are required, actionConnect( ) begins by validating that they have all been entered. If one or more settings are missing, an error dialog box is displayed to notify the user. Once all the settings have been correctly entered, the dispose( ) method is called to close the dialog box.
Drawing EAN13 In Java
Using Barcode printer for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
Code 39 Full ASCII Encoder In Java
Using Barcode drawer for Java Control to generate, create ANSI/AIM Code 39 image in Java applications.
The actionCancel( ) Method
Draw Code 93 Full ASCII In Java
Using Barcode drawer for Java Control to generate, create Code 93 Full ASCII image in Java applications.
Read Code39 In C#.NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
The actionCancel( ) method, shown here, is called when the Cancel button in the dialog box is clicked or when the dialog box is closed:
Encoding UPC Symbol In Objective-C
Using Barcode creator for iPhone Control to generate, create UPC-A image in iPhone applications.
Data Matrix ECC200 Printer In None
Using Barcode generator for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
// Cancel connecting and exit program. private void actionCancel() { System.exit(0); }
Decode Code128 In Visual C#.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
Draw UPC-A In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create UCC - 12 image in VS .NET applications.
Canceling the Connect dialog box results in E-mail Client being shut down with a call to System.exit( ). E-mail Client is terminated in this scenario because it cannot function without an e-mail server connection.
UCC - 12 Maker In None
Using Barcode generation for Font Control to generate, create GTIN - 128 image in Font applications.
Make EAN 128 In None
Using Barcode printer for Microsoft Excel Control to generate, create GS1-128 image in Microsoft Excel applications.
Accessor Methods
The ConnectDialog class has a number of accessor methods for retrieving the connection settings entered in the dialog box. Each of the getType( ), getServer( ), getUsername( ), getPassword( ), and getSmtpServer( ) methods simply returns the value entered into its corresponding control.
The DownloadingDialog Class
Immediately after the Connect dialog box has been disposed, the Downloading dialog box illustrated in Figure 5-3 is launched. This dialog box tells the user that e-mail messages are being downloaded. Additionally, because the Downloading dialog box is modal, it prevents the user from using any other part of E-mail Client while downloading is under way.
Figure 5-3
The Downloading dialog box
5: Implementing an E-mail Client in Java
The DownloadingDialog class is shown here. Notice that it extends JDialog:
import java.awt.*; import javax.swing.*; /* This class displays a simple dialog box instructing the user that messages are being downloaded. */ public class DownloadingDialog extends JDialog { // Constructor for dialog box. public DownloadingDialog(Frame parent) { // Call super constructor, specifying that dialog box is modal. super(parent, true); // Set dialog box title. setTitle("E-mail Client"); // Instruct window not to close when the "X" is clicked. setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); // Put a message with a nice border in this dialog box. JPanel contentPane = new JPanel(); contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5)); contentPane.add(new JLabel("Downloading messages...")); setContentPane(contentPane); // Size dialog box to components. pack(); // Center dialog box over application. setLocationRelativeTo(parent); } }
The DownloadingDialog class is clear cut in that it contains only a constructor method. The constructor begins by mirroring the ConnectDialog constructor with super( ) and setTitle( ) method calls. Next, the setDefaultCloseOperation( ) method is called to change the dialog box s behavior so that it doesn t close when the close box is clicked. This prevents the user from being able to close the window prematurely. After that, the message label is added to the display with an empty (invisible) border of 5 pixels for spacing. Next, pack( ) is invoked to size the dialog box to the minimum size required by its controls. Finally, a call to setLocationRelativeTo( ) centers the dialog box over the parent window.
The Art of Java
The MessageDialog Class
The Message dialog box, shown in Figure 5-4, is used to enter messages that will be sent by the EmailClient class. It is created by the MessageDialog class. This class is used for new messages, as shown in Figure 5-4, as well as reply to and forward messages. The MessageDialog class is shown here. Notice that it extends JDialog:
import import import import java.awt.*; java.awt.event.*; javax.mail.*; javax.swing.*;
// This class displays the dialog box used for creating messages. public class MessageDialog extends JDialog { // Dialog box message identifiers. public static final int NEW = 0; public static final int REPLY = 1; public static final int FORWARD = 2; // Message From, To, and Subject text fields. private JTextField fromTextField, toTextField; private JTextField subjectTextField; // Message content text area. private JTextArea contentTextArea; // Flag specifying whether or not dialog box was cancelled. private boolean cancelled; // Constructor for dialog box. public MessageDialog(Frame parent, int type, Message message) throws Exception { // Call super constructor, specifying that dialog box is modal. super(parent, true); /* Set dialog box title and get message's "To", "Subject", and "content" values based on message type. */ String to = "", subject = "", content = ""; switch (type) { // Reply message. case REPLY: setTitle("Reply To Message");
Copyright © OnBarcode.com . All rights reserved.