如何获取java中的打印状态？

Question

我正在使用以下 java 代码打印具有打印状态的 pdf 文件，但打印状态（ printDataTransferCompleted、printJobCompleted、printJobFailed、printJobCanceled 等）没有返回。

下面是Java代码，

    PDDocument document = PDDocument.load(new File("D:\\Rose\\Work\\17.pdf"));

        PrintService myPrintService = findPrintService("Champ RP Series");

        PrinterJob job = PrinterJob.getPrinterJob();
        job.setPageable(new PDFPageable(document));
        job.setPrintService(myPrintService);
        job.print();
        if(job.isCancelled() == true) {
            System.out.println("cancelled"+ job.isCancelled());
            
        }else {
            System.out.println("progress"+ job.isCancelled());
        }
       
        DocPrintJob docPrint = myPrintService.createPrintJob();
        System.out.println(docPrint.getPrintService());
        docPrint.addPrintJobListener(new PrintJobListenerSample());

如何返回打印状态（printDataTransferCompleted、printJobCompleted、printJobFailed、printJobCanceled 等）？

谢谢

Answer 1

很有可能，在您的代码按预期运行后，已交付正确的结果。 相反，您的代码将无法正确执行，但会在（无论出于何种原因）抛出异常时中止。 因此，要报告此状态，您可以使用 try-catch 块：

try {
    // place here your logic from your question

    // check if the job was cancelled by user
    if (job.isCancelled()) {
        log.info("job cancelled by user");
        return printJobCancelled;
    }

    return printDataTransferCompleted; // mark success
} catch (Exception e} {        // bad pattern to catch Exception. Get more concise if you can
    log.error("Could not print", e); // at least log what happened. If necessary, throw some exception
    return printJobFailed;    // mark failure
}