Question

我想在打印30份（在打印机上逐字打印）完成后再暂停约10分钟并再次执行。

public class printImage {
    static public void main(String args[]) throws Exception {
        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        pras.add(new Copies(30));

        PrintService pss[] = PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.GIF, pras);

        PrintService ps = pss[4];
        System.out.println("Printing to " + ps);

        DocPrintJob job = ps.createPrintJob();

        FileInputStream fin = new FileInputStream("mypic.JPG");
        Doc doc = new SimpleDoc(fin, DocFlavor.INPUT_STREAM.GIF, null);

        job.print(doc, pras);
        fin.close();
    } 
}

Answer 1

您似乎需要检查PrintJobListener界面。

此侦听器接口的实现应附加到a DocPrintJob用于监控打印机作业的状态。这些回调可以在处理打印作业的线程上调用方法，或者服务创建通知线程。无论哪种情况，客户都应该在这些回调中不执行冗长的处理。

您可以将代码修改为：

public static void main(String[] args) throws IOException, PrintException {
        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
        pras.add(new Copies(30));

        PrintService pss[] = (PrintService[]) PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.GIF, pras);

        PrintService ps = pss[4];
        System.out.println("Printing to " + ps);

        DocPrintJob job = pss[0].createPrintJob();

        FileInputStream fin = new FileInputStream("mypic.JPG");
        Doc doc = new SimpleDoc(fin, DocFlavor.INPUT_STREAM.GIF, null);

        // Monitor print job events
        PrintJobWatcher pjDone = new PrintJobWatcher(job);

        job.print(doc, pras);

        // Wait for the print job to be done
        pjDone.waitForDone();

        fin.close();

    }

班级PrintJobWatcher是：

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) {
        }
    }
}

当您的打印作业完成后，您可以在那里进行睡眠而不是allDone方法。

任务完成后再次执行

1 个答案: