cancel.html

来自「java类库详细讲解」· HTML 代码 · 共 154 行

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<TITLE>Cancelling a Print Job
(Java Developers Almanac Example)
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  <h3>
    e709.  
    Cancelling a Print Job</h3>

Not all print jobs can be cancelled.  A print job can be cancelled if the
PrintJob object implements <code>CancelablePrintJob</code>.

This example shows a cancel button if the print job can be cancelled.


<pre>
    try {
        // Create the print job
        final DocPrintJob job = <font color="#0066ff"><i>service</i></font>.createPrintJob();
        Doc doc = new SimpleDoc(is, <font color="#0066ff"><i>flavor</i></font>, null);
    
        // Monitor print job events
        // See "Determining When a Print Job Has Finished"
        // for the implementation of PrintJobWatcher
        PrintJobWatcher pjDone = new PrintJobWatcher(job);
    
        // Sample code to display a cancel button
        JFrame frame = new JFrame();
        if (job instanceof CancelablePrintJob) {
            JButton btn = new JButton("Cancel Print Job");
            btn.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    CancelablePrintJob cancelJob = (CancelablePrintJob)job;
                    try {
                        cancelJob.cancel();
                    } catch (PrintException e) {
                        // Possible reason is job was already finished
                    }
                }
            });
    
            frame.getContentPane().add(btn, BorderLayout.CENTER);
            frame.pack();
            frame.setVisible(true);
        }
    
        // Print it
        job.print(doc, null);
    
        // Wait for the print job to be done
        pjDone.waitForDone();
    
        // Remove frame
        frame.setVisible(false);
    
        // It is now safe to close the input stream
        is.close();
    } catch (PrintException e) {
        if (e.getCause() instanceof java.awt.print.PrinterAbortException) {
            // Print job was cancelled
        }
    }
</pre>
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            &nbsp;Related Examples
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e704. <a class="eglink" href="BasicPrint.html?l=rel">
    The Quintessential Printing Program Using a Printing Service
</a>
<br>

e705. <a class="eglink" href="BasicStream.html?l=rel">
    The Quintessential Printing Program Using a Streaming Printing Service
</a>
<br>

e706. <a class="eglink" href="WaitForDone.html?l=rel">
    Determining When a Print Job Has Finished
</a>
<br>

e707. <a class="eglink" href="DiscoverAll.html?l=rel">
    Discovering Available Print Services
</a>
<br>

e708. <a class="eglink" href="DiscoverStream.html?l=rel">
    Discovering Available Streaming Print Services
</a>
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