java - 打印时 PDFBox 内存不足

Question

我在使用默认打印机直接打印 PDF 文件的软件时遇到问题。有时，当用户打印 PDF 文件时，我会收到 OutOfMemoryError，但我不知道问题出在哪里。

java.lang.OutOfMemoryError: Java heap space 
    at java.awt.image.DataBufferInt.<init>(Unknown Source) 
    at java.awt.image.Raster.createPackedRaster(Unknown Source) 
    at java.awt.image.DirectColorModel.createCompatibleWritableRaster(Unknown Source) 
    at java.awt.image.BufferedImage.<init>(Unknown Source) 
    at org.apache.pdfbox.pdmodel.graphics.color.PDDeviceGray.toRGBImage(PDDeviceGray.java:78) 
    at org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.from1Bit(SampledImageReader.java:216) 
    at org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.getRGBImage(SampledImageReader.java:142) 
    at org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.getImage(PDImageXObject.java:340) 
    at org.apache.pdfbox.rendering.PageDrawer.drawImage(PageDrawer.java:793) 
    at org.apache.pdfbox.contentstream.operator.graphics.DrawObject.process(DrawObject.java:62) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:815) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:472) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:446) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.showForm(PDFStreamEngine.java:178) 
    at org.apache.pdfbox.contentstream.operator.graphics.DrawObject.process(DrawObject.java:70) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:815) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:472) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:446) 
    at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:149) 
    at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:189) 
    at org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:208) 
    at org.apache.pdfbox.rendering.PDFRenderer.renderPageToGraphics(PDFRenderer.java:169) 
    at org.apache.pdfbox.printing.PDFPrintable.print(PDFPrintable.java:184) 
    at sun.print.RasterPrinterJob.printPage(Unknown Source) 
    at sun.print.RasterPrinterJob.print(Unknown Source)

我使用此代码通过 PDFBox 加载 PDF 文件并使用 Java 进行打印。

try (PDDocument doc = PDDocument.load(fileToPrint)) {

    PrinterJob job = PrinterJob.getPrinterJob();

    job.setJobName(jobName);
    job.setPageable(new PDFPageable(doc, Orientation.AUTO, false, 300));
    job.setPrintService(printerService);

    ...

    job.print(attributes);

    ...

} catch (IOException e) {
    ...
} catch (PrinterException e) {
    ...
}

使用PDFBox打印的方法

@Test
   public void currentVersionTest() throws IOException, PrinterException {

      String jobName = testDocumentPdf.getFileName().toString();

      try (PDDocument doc = PDDocument.load(testDocumentPdf.toFile(), MemoryUsageSetting.setupTempFileOnly())) {

         PrinterJob job = PrinterJob.getPrinterJob();

         job.setJobName(jobName);
         job.setPageable(new PDFPageable(doc, Orientation.AUTO, false, 0));
         job.setPrintService(printService);

         PrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
         attributes.add(Chromaticity.MONOCHROME);

         job.print(attributes);

      }

      checkJobInQueue(jobName);
   }

Answer 1

内存消耗取决于多个因素，例如图像数量、DPI 设置等。您可能需要调整应用程序的内存设置。

请查看https://pdfbox.apache.org/2.0/faq.html#outofmemoryerror获取一些改善内存需求/设置的建议。