iText旋转创建pdf，显示内存不足异常

Question

以下是创建pdf文件的代码段，其中页面可以在生成的文件中旋转。这适用于大多数pdf文件。但是，在对其应用进一步旋转时，页面的一个特定pdf文件已经旋转了180。 90度并保存文件会导致文件损坏。事实上，即使您不旋转文件并使用iText将文件写入另一个文件，生成的PDF文件也会损坏，并在Adobe Reader中打开时显示内存不足异常。

为什么会这样？我在文件中遗漏了某种压缩。

private String createPdfFileWithoutForms(final EditStateData[] editStateData, final String directory)
        throws EditingException {

        Long startTime = System.currentTimeMillis();

        File pdfFileToReturn = new File(directory + File.separator + UidGenerator.generate() + ".pdf");

        com.lowagie.text.Document document = null;
        FileOutputStream outputStream = null;
        PdfCopy pdfCopy = null;
        PdfReader reader = null;
        PdfDictionary pageDict = null;
        int rotationAngle = 0;
        Map<Integer, Integer> rotationQuadrants = null;

        try {

            document = new com.lowagie.text.Document();
            outputStream = new FileOutputStream(pdfFileToReturn);
            pdfCopy = new PdfCopy(document, outputStream);
            pdfCopy.setFullCompression();
            pdfCopy.setCompressionLevel(9);
            document.open();

            for (EditStateData state : editStateData) {
                try {
                    reader = new PdfReader(state.getFileName());
                    reader.selectPages(state.getPages());
                    rotationQuadrants = state.getRotationQuadrants();
                    for (int i = 1; i <= reader.getNumberOfPages(); i++) {
                        // Rotation quadrant key is the source page number
                        if (rotationQuadrants.containsKey(state.getPages().get(i - 1))) {
                            rotationAngle = reader.getPageRotation(i);
                            pageDict = reader.getPageN(i);
                            pageDict.put(PdfName.ROTATE,
                                new PdfNumber((rotationAngle 
                                    + rotationQuadrants.get(state.getPages().get(i - 1))) % 360));
                        }

                        document.setPageSize(reader.getPageSizeWithRotation(i));
                        document.newPage();
                        // import the page from source pdf
                        PdfImportedPage page = pdfCopy.getImportedPage(reader, i);
                        // add the page to the destination pdf
                        pdfCopy.addPage(page);
                    }
                } catch (final IOException e) {
                    LOGGER.error(e.getMessage(), e);
                    throw new EditingException(e.getMessage(), e);
                } finally {
                    if (reader != null) {
                        reader.close();
                    }
                }
            }
        } catch (final Exception e) {
            LOGGER.error(e.getMessage(), e);
            throw new EditingException(e.getMessage(), e);
        } finally {
            if (document != null) {
                document.close();
            }

            if (pdfCopy != null) {
                pdfCopy.close();
            }
            IoUtils.closeQuietly(outputStream);
        }

        LOGGER.debug("Combining " + editStateData.length + " pdf files took "
            + ((System.currentTimeMillis() - startTime) / 1000) + " msecs");

        return pdfFileToReturn.getAbsolutePath();
    }