177 lines
9.5 KiB
HTML
177 lines
9.5 KiB
HTML
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<title>Example: Displaying a list of server jobs in a GUI</title>
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</head>
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<body id="guiex1"><a name="guiex1"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Displaying a list of server jobs in a GUI</h1>
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<div><p></p>
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<div class="section"><p>Use the following as an example for your program.</p>
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<div class="note"><span class="notetitle">Note:</span> Read
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the <a href="codedisclaimer.htm#codedisclaimer">Code example disclaimer</a> for
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important legal information.</div>
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<pre>//////////////////////////////////////////////////////////////////////////////////
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//
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// Example using the IBM Toolbox for Java's vaccess
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// class, VJobList.
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//
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// This source is an example of IBM Toolbox for Java "Job List".
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//
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//////////////////////////////////////////////////////////////////////////////////
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package examples; <a href="#guiex1__dup0036">Note 1 </a>
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import com.ibm.as400.access.*;
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import com.ibm.as400.vaccess.*; <a href="#guiex1__dup0037">Note 2 </a>
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import javax.swing.*; <a href="#guiex1__dup0038">Note 3 </a>
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import java.awt.*;
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import java.awt.event.*;
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public class GUIExample
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{
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public static void main(String[] parameters) <a href="#guiex1__dup0039">Note 4 </a>
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{
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GUIExample example = new GUIExample(parameters);
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}
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public GUIExample(String[] parameters)
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{
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try <a href="#guiex1__dup0040">Note 5 </a>
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{
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// Create an AS400 object.
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//The system name was passed as the first command line argument.
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AS400 system = new AS400 (parameters[0]); <a href="#guiex1__dup0041">Note 6 </a>
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VJobList jobList = new VJobList (system); <a href="#guiex1__dup0042">Note 7 </a>
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// Create a frame.
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JFrame frame = new JFrame ("Job List Example"); <a href="#guiex1__dup0043">Note 8 </a>
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// Create an error dialog adapter. This will display any errors to the user.
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ErrorDialogAdapter errorHandler = new ErrorDialogAdapter (frame); <a href="#guiex1__dup0044">Note 9 </a>
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// Create an explorer pane to present the job list.
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AS400ExplorerPane explorerPane = new AS400ExplorerPane (jobList); <a href="#guiex1__ten">Note 10 </a>
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explorerPane.addErrorListener (errorHandler); <a href="#guiex1__eleven">Note 11 </a>
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// Use load to load the information from the system.
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explorerPane.load(); <a href="#guiex1__twelve">Note 12 </a>
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// When the frame closes, exit the program.
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frame.addWindowListener (new WindowAdapter () <a href="#guiex1__thirteen">Note 13 </a>
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{
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public void windowClosing (WindowEvent event)
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{
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System.exit(0);
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}
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} );
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// Layout the frame with the explorer pane.
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frame.getContentPane().setLayout(new BorderLayout() );
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frame.getContentPane().add("Center", explorerPane); <a href="#guiex1__fourteen">Note 14 </a>
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frame.pack();
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frame.show(); <a href="#guiex1__fifteen">Note 15 </a>
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}
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catch (Exception e)
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{
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e.printStackTrace(); <a href="#guiex1__sixteen">Note 16 </a>
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}
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System.exit(0); <a href="#guiex1__seventeen">Note 17 </a>
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}
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}</pre>
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</div>
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<div class="section"><ol><li id="guiex1__dup0036"><a name="guiex1__dup0036"><!-- --></a>This class is in the examples package. Java™ uses
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packages to avoid name conflicts between Java class files.</li>
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<li id="guiex1__dup0037"><a name="guiex1__dup0037"><!-- --></a>This line makes all of the IBM<sup>®</sup> Toolbox for Java classes in the vaccess package available
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to this program. The classes in the vaccess package have the common prefix
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com.ibm.as400.vaccess. By using an import statement, the program calls the
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name instead of the package plus name. For example, you can reference the
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AS400ExplorerPane class by using AS400ExplorerPane, not com.ibm.as400.AS400ExplorerPane.</li>
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<li id="guiex1__dup0038"><a name="guiex1__dup0038"><!-- --></a>This line makes all of the Java Foundation Classes (JFC) in the Swing
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package available to this program. Java programs that use the IBM Toolbox for Java vaccess
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(GUI) classes need JDK 1.1.2 plus Java Swing 1.0.3 from Sun Microsystems,
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Inc. Swing is available with Sun's JFC 1.1.</li>
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<li id="guiex1__dup0039"><a name="guiex1__dup0039"><!-- --></a>This class has a main method so it can be run as an application.
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To invoke the program, run "java examples.GUIExample serverName", where serverName
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is the name of your server. Either the jt400.zip or jt400.jar must be in
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your classpath for this to work.</li>
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<li id="guiex1__dup0040"><a name="guiex1__dup0040"><!-- --></a>The IBM Toolbox for Java code throws exceptions that your program
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must catch.</li>
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<li id="guiex1__dup0041"><a name="guiex1__dup0041"><!-- --></a>The AS400 class is used by IBM Toolbox for Java. This class manages sign-on information,
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creates and maintains socket connections, and sends and receives data. In
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this example, the program will pass the server name to the AS400 object.</li>
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<li id="guiex1__dup0042"><a name="guiex1__dup0042"><!-- --></a>The VJobList class is used by the IBM Toolbox for Java to represent a list of server jobs
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that can be displayed in a vaccess (GUI) component. Notice that the AS400
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object is used to specify the server on which the list resides.</li>
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<li id="guiex1__dup0043"><a name="guiex1__dup0043"><!-- --></a>This line constructs a frame or a top-level window that will
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be used to display the job list.</li>
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<li id="guiex1__dup0044"><a name="guiex1__dup0044"><!-- --></a>ErrorDialogAdapter is an IBM Toolbox for Java graphical user interface (GUI) component
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that is created to automatically display a dialog window whenever an error
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event occurs in the application.</li>
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<li id="guiex1__ten"><a name="guiex1__ten"><!-- --></a>This line creates an AS400ExplorerPane, a graphical user interface
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(GUI) that represents a hierarchy of objects within a server resource. The
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AS400ExplorerPane presents a tree on the left side rooted at the VJobList
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and the details of the resource in the right side. This only initializes the
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pane to a default state and does not load the contents of the VJobList to
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the pane.</li>
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<li id="guiex1__eleven"><a name="guiex1__eleven"><!-- --></a>This line adds the error handler you created in step nine
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as a listener on the VJobList graphical user interface (GUI) component.</li>
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<li id="guiex1__twelve"><a name="guiex1__twelve"><!-- --></a>This line loads the contents of the JobList into the ExplorerPane.
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This method must be called explicitly to communicate to and load information
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from the server. This gives the application control over when the communication
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with the server will occur. With this you can: <ul><li>Load the contents before adding the pane to a frame. The frame does not
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appear until all the information is loaded, as in this example.</li>
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<li>Load the contents after adding the pane to a frame and displaying that
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frame. The frame appears with a "wait cursor" and the information is filled
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in as it is loaded.</li>
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</ul>
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</li>
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<li id="guiex1__thirteen"><a name="guiex1__thirteen"><!-- --></a>This line adds a window listener so that the application
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ends when the frame closes.</li>
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<li id="guiex1__fourteen"><a name="guiex1__fourteen"><!-- --></a>This line adds the job list graphical user interface GUI
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component to the center of the controlling frame.</li>
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<li id="guiex1__fifteen"><a name="guiex1__fifteen"><!-- --></a>This line calls the show method to make the window visible
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to the user.</li>
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<li id="guiex1__sixteen"><a name="guiex1__sixteen"><!-- --></a>IBM Toolbox for Java exceptions are translated so the text
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will appear in the language of the workstation. For example, this program
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displays the text of the exception as its error processing.</li>
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<li id="guiex1__seventeen"><a name="guiex1__seventeen"><!-- --></a>The IBM Toolbox for Java creates threads to carry out IBM Toolbox for Java activity.
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If the program does not do System.exit(0) when it is terminated, the program
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may not exit normally. For example, if the program was run from a Windows<sup>®</sup> 95
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DOS prompt without this line, the command prompt does not return when the
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program finished.</li>
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</ol>
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</div>
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</div>
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</body>
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