Part 3. Extending the GUI of native Notes apps with Java applets
by Richard Pajerski
Posted on Wednesday April 01, 2015 at 11:12AM in Tutorials
*** July 2018 UPDATE ***
Links to the final database and Java source are included at the bottom of this blog entry.
In Parts 1 and 2, we created a Java applet and incorporated it into a Notes database. In this last part, we're going to code the export functionality in our applet and refresh the applet in Notes.
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Part 3 -- Export Notes data using the applet
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Step 1. Program the Start button. Open the ContactExport class in NetBeans and at the top of the code editor, click the Design button for the visual representation of the applet. Then right-click on the Start button and then Events > Action > actionPerformed. NetBeans will create a method called jButton1ActionPerformed and place our cursor at the appropriate spot in the source where we can add code that executes when the button's clicked. So we start with:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
When we click the Start button, we want to immediately disable it so only one export operation runs at a time. This would normally just be the following one line of code:
jButton1.setEnabled(false);
However, in Swing, we need to make sure to put any code that updates the UI on the event dispatch thread. So we're going to disable the button in a new thread:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try {
java.awt.EventQueue.invokeAndWait(new Runnable() {
public void run() {
jButton1.setEnabled(false);
}
});
} catch (Exception ex) {
ex.printStackTrace();
}
}
Step 2. Create a separate thread to access our Notes database. Next, we're going to create a separate thread that will connect to Notes. For now, we're going to implement this as a private inner class inside our applet. Toward the bottom of our ContactExample class, add:
private class ExportRunner implements Runnable {private Thread t;
@Override
public void run() {}
public void start() {
t = new Thread(this);
t.start();
}
}
We're going to place most of our functional export code in the ExportRunner's run() method which is the method that gets called when we start a Java thread. Add the following block to the ExportRunner's run() method to access the "All Contacts" view and its documents:
@Override
public void run() {
try {
Session s = ContactExport.this.openSession();
Database db = s.getDatabase("", "Contacts.nsf");
View allContactsView = db.getView("AllContacts");
Document d = allContactsView.getFirstDocument();
while (d != null) {
// We access the data here...
Document tmpDoc = allContactsView.getNextDocument(d);
d.recycle();
d = tmpDoc;
}
allContactsView.recycle();
db.recycle();
} catch (NotesException nex) {
nex.printStackTrace();
}
}
Step 3. Cycle through the contact documents and save the contents to internal buffer. First, add a StringBuilder in the ExportRunner class which will serve as the internal buffer to store the comma-delimited data. Also declare a platform-independent line separator.
private class ExportRunner implements Runnable {
private Thread t;
private StringBuilder sb = new StringBuilder();
private String newline = System.getProperty("line.separator");
Back in ExportRunner's run() method, we next want to update the while loop to extract the contact field data and separate the fields with commas and a final carriage return at the end of each line:
while (d != null) {
String firstName = d.getItemValueString("FirstName");
String lastName = d.getItemValueString("LastName");
String phone = d.getItemValueString("Phone");
String city = d.getItemValueString("City");
sb.append(firstName);
sb.append(",");
sb.append(lastName);
sb.append(",");
sb.append(phone);
sb.append(",");
sb.append(city);
sb.append(newline);
Document tmpDoc = allContactsView.getNextDocument(d);
d.recycle();
d = tmpDoc;
}
Step 4. Update the progress bar as we go through the contacts. This may sound straightforward but it takes some setup. Let's start by adding these variables to the ExportRunner class, just below the StringBuilder declaration:
private class ExportRunner implements Runnable {
private Thread t;
private StringBuilder sb = new StringBuilder();
private String newline = System.getProperty("line.separator");
private int contactCount;
private javax.swing.Timer progBarTimer;
NetBeans' GUI builder will have already declared a JProgressBar for us using the variable name jProgressBar1 when we added the progress bar component to our JPanel back in Part 1. But to animate the JProgressBar, we need to create two additional items: a handler class and timer class. We're going to create the handler class as a new private inner class in the ExportRunner class. We'll call it ProgressBarHandler:
private class ProgressBarHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
int v = contactCount;
if (v != 0) {
jProgressBar1.setValue(v);
}
}
}
And we'll instantiate the Timer class by inserting this as our first line in the run() method of our ExportRunner class:
progressBarTimer = new javax.swing.Timer(2, new ProgressBarHandler());
The Timer takes our handler class as a parameter and, once started, will call its actionPerformed method every two milliseconds. In actionPerformed, we explicitly set the progress bar's value. When the thread starts, we start the Timer, prime the progress bar with starting and ending values and then update those values as we loop through the documents.
We're also going to add a new method to ExportRunner called isDone() that holds a boolean variable indicating when the export is complete. We set the boolean variable to true when we're done processing the documents and when the handler sees that, it sets the progress bar back to zero and stops the Timer. It also takes care of re-enabling our Start button.
Beyond the progress bar animation, a good GUI practice is to let the user know when the system is busy. We're going to do that with the following commands:
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
Place the WAIT_CURSOR command outside the ExportRunner class – at the beginning of the jButton1ActionPerformed method and put the DEFAULT_CURSOR command as the last line in the handler class.
Here's the latest version of ExportRunner:
private class ExportRunner implements Runnable {private Thread t;
private StringBuilder sb = new StringBuilder();
private String newline = System.getProperty("line.separator");
private int contactCount;
private javax.swing.Timer progressBarTimer;
private boolean done = false;@Override
public void run() {try {
progressBarTimer = new javax.swing.Timer(2, new ProgressBarHandler());Session s = ContactExport.this.openSession();
Database db = s.getDatabase("", "Contacts.nsf");
View allContactsView = db.getView("AllContacts");// Set the progress bar's minimum and maximum values.
jProgressBar1.setMinimum(0);
// Total contact documents in our view.
jProgressBar1.setMaximum(allContactsView.getEntryCount());// Start the timer.
progressBarTimer.start();Document d = allContactsView.getFirstDocument();
while (d != null) {
Thread.sleep(1); // Pause this loop to give other threads a chance to run.
contactCount++; // Increment the number of contacts processed.String firstName = d.getItemValueString("FirstName");
String lastName = d.getItemValueString("LastName");
String phone = d.getItemValueString("Phone");
String city = d.getItemValueString("City");
sb.append(firstName);
sb.append(",");
sb.append(lastName);
sb.append(",");
sb.append(phone);
sb.append(",");
sb.append(city);
sb.append(newline);
Document tmpDoc = allContactsView.getNextDocument(d);
d.recycle();
d = tmpDoc;
}
allContactsView.recycle();
db.recycle();} catch (NotesException nex) {
nex.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
done = true;
}
}public void start() {
t = new Thread(this);
t.start();
}private boolean isDone() {
return done;
}private class ProgressBarHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
int v = contactCount;
if (v != 0) {
jProgressBar1.setValue(v);
}
if (ExportRunner.this.isDone()) {
progressBarTimer.stop();
jProgressBar1.setValue(0);
jButton1.setEnabled(true);
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}
}
}
Finally, to instantiate and run this new class when the Start button is clicked, go back to jButton1ActionPerformed and add these two lines to the run() method:
ExportRunner exportRunner = new ExportRunner();
exportRunner.start();
The actionPerformed method should now look like:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
jButton1.setEnabled(false);
ExportRunner exportRunner = new ExportRunner();
exportRunner.start();
}
Step 6. Store the output after prompting the user for a location. Our data is now in our StringBuilder object but in Java, it takes a few steps to get that data into a file. For additional flexibility, we're also going to prompt the user for a file name and location using a JFileChooser. Put this block just after the db.recycle() command in ExportRunner's run() method:
JFileChooser jFileChooser = new JFileChooser();
jFileChooser.setSelectedFile(new File("ExportedContacts.txt"));
int save = jFileChooser.showSaveDialog(ContactExport.this);if (save == JFileChooser.APPROVE_OPTION) {
FileOutputStream stream = null;
PrintStream out = null;
try {
File file = jFileChooser.getSelectedFile();
stream = new FileOutputStream(file);
out = new PrintStream(stream);
out.print(sb.toString());
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
if (stream != null) {
stream.close();
}
if (out != null) {
out.close();
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
That's it for the code. Now recompile the applet and refresh it in Notes (see Step 5 of Part 2). Populate the Notes database with some sample contact data and try it out.
Conclusion
Embedding custom Java applets in the Notes client is a powerful way of extending the value of Notes client applications. It's a little more involved than building out similar functionality with traditional Notes design elements but it offers benefits that just aren't available in Notes. Considering the size of the Java API and availability of third party Java-based tools, this example only scratches the surface of the possibilities.
Files and source code
Contacts.nsf.zip
ContactExport-src.zip
Part 2. Extending the GUI of native Notes apps with Java applets
by Richard Pajerski
Posted on Thursday March 26, 2015 at 11:27PM in Tutorials
In Part 1, we created a Java applet using NetBeans that will allow us to export Notes contact data. In this second part, we're going to walk through getting that applet set up properly in a Notes database. I've created a small database called Contacts and populated it with several contact documents, each with only four fields: First Name, Last Name, Phone and City. In order to highlight the basic goal of applet integration, I'm only going to discuss the database design aspects directly related to the applet.
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Part 2 -- Integrating the applet in the Notes Client
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Step 1. Compile the project in NetBeans. First compile the applet (right-click on the project then Clean and Build). This step will produce a file called ContactExport.jar, which will be created in the project's dist folder.
Step 2. Create a Page element and embed the applet in it. In Domino Designer, create a new Page design element called ContactApplet. Open the page, hit Enter at least once to produce a small page header and then type Export Contact List. Hit Enter again and from the menu, Create > Java Applet. You'll first be presented with a Create Java Applet dialog; click the Locate button in the lower right to get the Locate Java Applet Files dialog. Now click the folder icon beside the Base Directory field to navigate to our project's dist folder (in my case, D<colon><backslash>temp<backslash>ContactExport<backslash>dist). Click Ok and you should now see the ContactExport.jar file. Click Add/Replace File(s) and in the Base class field at the top right, enter com.example.ContactExport.class (which is our applet's main class file). Click Ok twice and save the Page.
Step 3. Link the ContactExport Page element to the default Outline. The Contacts database uses a Frameset and Outline for the main navigation where clicking on the left-hand navigation places the view or page on the right frame. I've already created a default Outline called Main that displays the database's views and now we're going to add an entry to the Outline. The entry will be the ContactExport Page element from Step 2.
At this point, the applet is ready to work in the Notes client. However, we'll need to make some minor adjustments to both the applet and page to improve the presentation.
Step 4. Change applet look and feel and adjust border. For better visual integration, we're going to tell the applet to use the "system" look and feel so that it fits in better with the underlying platform (in this example, Windows 8). In the notesAppletInit method, expand the section labelled "Look and feel setting code". Remove the for{} block and replace it with:
javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
This tells Java to pick up the native look and feel for the underlying platform. In addition, since we're only going to be displaying a button and progress bar, we're also going to shrink the applet window size. Simply grab the frame of the applet in the GUI builder and drag to resize. Once you have an appropriate size, double-click the border and record the applet's width and height -- we'll need to use these dimensions for the embedded applet in the page design element.
Step 5. Update the page and resize the applet. Be sure to Clean and Build the project again in NetBeans so that a new applet jar file is created in the project's dist directory. Now go back to the ContactApplet page in Domino Designer, right-click on the embedded applet, click Refresh from the menu then Refresh All; click Ok and save the page.
Next, resize the applet in the page to match the dimensions from the applet's window size from NetBeans (Step 4 above). Unfortunately, this must be done with the mouse -- the size properties on the Java Applet properties box is read only.
Finally, I'm going to change the background color of the page to light gray to better blend with the applet and move applet slightly towards the left margin (Text Properties box).
And here's what we have so far:
In Part 3, we'll code the applet to select documents from the Notes view and export them to a comma-delimited file.
Part 1. Extending the GUI of native Notes apps with Java applets
by Richard Pajerski
Posted on Tuesday March 24, 2015 at 12:28PM in Tutorials
Notes/Domino application development has for years targeted the web browser for the GUI but for many organizations, a large portion of apps are written for the native Notes client. While a common path for extending these native apps is to develop a portion of them as web apps, another powerful way is to implement Java applets in forms and pages. Even though Java applets were initially intended for web browsers, we can use use them as though they were native Notes widgets right in the Notes client.
The ability to embed Java applets in the Notes client has been available since Java itself was introduced into the environment way back in the 4.x days. However, applets were a tough sell then for a number of reasons, among them slow load times and sub-par look and feel. It wasn't until Java 6 was available in the 8.x client – a dozen years later – that custom applets became a realistic option for production Notes apps.
Let's look at a custom applet that can retrieve a contact list from a Notes 9 database and let the user export that data to a comma-delimited file. For this example, I'm using the NetBeans IDE (version 8.02) to develop the applet. The applet will compile to a jar archive which we'll import into the Designer client. Familiarity with Java and using Domino Designer will be assumed but since NetBeans and Java Applets in particular are not commonly used in Notes development, I'll try to be a bit more detailed when referring to them.
In Part 1, we'll set up the applet project in NetBeans. In Part 2, we'll walk through getting the applet integrated in Notes. Finally, in Part 3, we'll code the applet source with the main functionality and then refresh the Notes database with the updates.
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Part 1 -- Setting up the NetBeans project.
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Step 1. Create a new Java Project. From the menu, Start > New Project and choose new Java Application. I'm calling the new project ContactExport and using com.example as the default package.
By default, this creates a class file called ContactApplet but we're not going to use it. We're going to create a JApplet Form (Step 2) file and use that instead so the ContactApplet file can safely be deleted.
Step 2. Create a JApplet. Create a new JApplet form in the com.example package called ContactExport. This allows us to use the GUI builder in NetBeans which can greatly simplify designing a Swing-based user interface.
Step 3. Set Source/Binary Format to JDK 6 and add NCSO.jar as a library. Right-click on the project, then Properties, Source and make sure that the Source/Binary Format (at the bottom of the dialog) is set to JDK 6 which matches the JRE version on Notes 9. Next, in the same dialog, click Librairies on the left-hand navigation and then on the right, Add JAR/Folder. Here we add the NCSO.jar (found in the Notes\Data\domino\java directory) as a library for this project to expose the Notes Java API.
Step 4. Extend JAppletBase. By default, the applet extends javax.swing.JApplet but let's change that to extend lotus.domino.JAppletBase. Next, click the light bulb in the left margin to import the lotus.Domino.JAppletBase package.
Step 5. Update init() method. Change the applet's init() method to notesAppletInit(). Since we've changed our default class from javax.swing.JApplet to lotus.domino.JAppletBase, we need to use this new method to initialize the applet.
Step 6. Add components to the applet. Switch to Design mode (click 'Design' at the top of the source Editor) and drag and drop a JPanel to the applet background; then size it till it covers the entire visual space of applet. Next, add a Start button (JButton) and a progress bar (JProgressBar) to the JPanel. Right-click on the button, click Edit Text and change to name to Start.
That completes getting the basics of the applet itself set up. We'll cover making it functional in Part 3. But next, in Part 2, we're going to import the applet into Notes using Domino Designer and show how to embed it in a Notes Page design item.
