waitfordone.html

来自「java类库详细讲解」· HTML 代码 · 共 167 行

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<TITLE>Determining When a Print Job Has Finished
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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    <B><A HREF="../javax.print/pkg.html">javax.print</A></B><font color="#666666" SIZE="-2">
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  <h3>
    e706.  
    Determining When a Print Job Has Finished</h3>

Since <code>DocPrintJob.print()</code> is not guaranteed to be synchronous, it
is necessary to watch for a print job completion event before closing
the input stream. This example implements a convenient class that you
can use while waiting for a print job to finish.  


<pre>
    try {
        // Open the image file
        InputStream is = new BufferedInputStream(
            new FileInputStream(<font color="#0066ff"><i>"filename.gif"</i></font>));
        // Create the print job
        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
        PrintJobWatcher pjDone = new PrintJobWatcher(job);
    
        // Print it
        job.print(doc, null);
    
        // Wait for the print job to be done
        pjDone.waitForDone();
    
        // It is now safe to close the input stream
        is.close();
    } catch (PrintException e) {
    } catch (IOException e) {
    }
    
    class PrintJobWatcher {
        // true iff it is safe to close the print job's input stream
        boolean done = false;
    
        PrintJobWatcher(DocPrintJob job) {
            // Add a listener to the print job
            job.addPrintJobListener(new PrintJobAdapter() {
                public void printJobCanceled(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobCompleted(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobFailed(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobNoMoreEvents(PrintJobEvent pje) {
                    allDone();
                }
                void allDone() {
                    synchronized (PrintJobWatcher.this) {
                        done = true;
                        PrintJobWatcher.this.notify();
                    }
                }
            });
        }
        public synchronized void waitForDone() {
            try {
                while (!done) {
                    wait();
                }
            } catch (InterruptedException e) {
            }
        }
    }
</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>

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>
<br>

e709. <a class="eglink" href="Cancel.html?l=rel">
    Cancelling a Print Job
</a>
<br>


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