94 lines
5.2 KiB
HTML
94 lines
5.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Data queues" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="vdtaq" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Data queues</title>
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</head>
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<body id="vdtaq"><a name="vdtaq"><!-- --></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">Data queues</h1>
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<div><p></p>
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<div class="section"><p>The data queue graphical components allow a Java™ program
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to use any Java Foundation Classes (JFC) graphical text component
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to read or write to a server data queue.</p>
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</div>
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<div class="section"><p>The <a href="javadoc/com/ibm/as400/vaccess/DataQueueDocument.html#NAVBAR_TOP"> DataQueueDocument</a> and <a href="javadoc/com/ibm/as400/vaccess/KeyedDataQueueDocument.html#NAVBAR_TOP"> KeyedDataQueueDocument</a> classes are implementations of
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the JFC Document interface. These classes can be used directly with any JFC
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graphical text component. Several text components, such as single line fields
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(JTextField) and multiple line text areas (JTextArea), are available in JFC.</p>
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</div>
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<div class="section"><p>Data queue documents associate the contents of a text component
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with a server data queue. (A text component is a graphical component used
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to display text that the user can optionally edit.) The Java program
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can read and write between the text component and data queue at any time.
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Use DataQueueDocument for <strong>sequential</strong> data queues and KeyedDataQueueDocument
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for <strong>keyed</strong> data queues.</p>
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</div>
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<div class="section"><p>To use a DataQueueDocument, set both the system and path properties.
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These properties can be set using a constructor or through the setSystem()
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and setPath() methods. The DataQueueDocument object is then "plugged" into
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the text component, usually using the text component's constructor or setDocument()
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method. KeyedDataQueueDocuments work the same way.</p>
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</div>
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<div class="section"><p><span class="synph" id="vdtaq__vdtaqex1"><a name="vdtaq__vdtaqex1"><!-- --></a><span class="kwd"></span></span>The following example
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creates a DataQueueDocument whose contents are associated with a data queue:</p>
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</div>
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<div class="section"><div class="p"><pre> // Create the DataQueueDocument
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// object. Assume that "system" is
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// an AS400 object created and
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// initialized elsewhere.
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DataQueueDocument dqDocument = new DataQueueDocument (system, "/QSYS.LIB/MYLIB.LIB/MYQUEUE.DTAQ");
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// Create a text area to present the
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// document.
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JTextArea textArea = new JTextArea (dqDocument);
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// Add the text area to a frame.
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// Assume that "frame" is a JFrame
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// created elsewhere.
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frame.getContentPane ().add (textArea);</pre>
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</div>
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</div>
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<div class="section"><p>Initially, the contents of the text component are empty. Use read()
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or peek() to fill the contents with the next entry on the queue. Use write()
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to write the contents of the text component to the data queue. Note that these
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documents only work with String data queue entries.</p>
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</div>
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<div class="section"><p><strong><span class="synph" id="vdtaq__vdtaqexamples"><a name="vdtaq__vdtaqexamples"><!-- --></a><span class="kwd"></span></span>Examples</strong></p>
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</div>
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<div class="section"><p>Example of using a <a href="dataqueuedocumentexample.htm#dataqueuedocumentexample">DataQueueDocument</a> in
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an application.</p>
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</div>
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<div class="section"><p>Figure 1 shows the DataQueueDocument graphical user interface
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component being used in a JTextField. A button has been added to provide
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a GUI interface for the user to write the contents of the test field to the
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data queue.</p>
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</div>
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<div class="section"><p><strong>Figure 1: DataQueueDocument GUI component</strong></p>
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</div>
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<div class="section"><p><img src="rzahh081.gif" alt="DataQueueDocument GUI component" /></p>
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</div>
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</div>
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</body>
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</html> |