警告：您在 renderImageWithDPI 时没有关闭循环的 PDF 文档

Question

我想按页将 pdf 拆分为图像文件，但我收到警告：当 renderImageWithDPI 时，您没有关闭 PDF 文档循环仍然有警告更新代码：

    public void splitImage(PDDocument document, File checkFile, File theDirSplit, String fileExtension, File theDir, File watermarkDirectory, int numberOfPages)
            throws InvalidPasswordException, IOException {

        String fileName = checkFile.getName().replace(".pdf", "");
        int dpi = 300;
        if (theDirSplit.list().length < numberOfPages)
        {
            for (int i = 0; i < numberOfPages; ++i)
            {       
                if (i == numberOfPages)
                    break;
                
                if (theDirSplit.list().length != numberOfPages)
                {
                    File outPutFile = new File(theDirSplit + Constan.simbol + fileName + "_" + (i + 1) + "." + fileExtension);
                    document = PDDocument.load(checkFile);
                    PDFRenderer pdfRenderer = new PDFRenderer(document);
                    BufferedImage bImage = pdfRenderer.renderImageWithDPI(i, dpi, ImageType.RGB);
                    ImageIO.write(bImage, fileExtension, outPutFile);
                                            
                }
                // splitService.watermark(outPutFile, (i + 1), watermarkDirectory, "pdf");
            }
            document.close();
            //System.out.println("Converted Images are saved at -> " + theDirSplit.getAbsolutePath());
        }
        System.out.println("Done Partial SPlit");
        /*
         * int i = 1; while (iterator.hasNext()) { PDDocument pd = iterator.next();
         * pd.save(theDirSplit + Constan.simbol + i++ + ".pdf"); }
         * System.out.println("Multiple PDF’s created");
         */

    }

error looping

警告总数与页数相同... 我已经尝试关闭但无法正常工作，此过程使我的服务器 java.lang.OutOfMemoryError: Java 堆 space

更新：

        else if ("pdf".equalsIgnoreCase(typeFile)) {
            System.out.println(
                    "target file " + downloadPath + R_OBJECT_ID + Constan.simbol + R_OBJECT_ID + "." + typeFile);
            
            //get jumlah halaman
            try(PDDocument document = PDDocument.load(checkFile)){
                File theDirSplit = new File(theDir.getAbsolutePath() + Constan.simbol + "splitImage");
                createFolder(theDirSplit);
                String fileExtension = "jpeg";
                File watermarkDirectory = new File(theDir.getAbsolutePath() + Constan.simbol + "watermarkImage");
                createFolder(watermarkDirectory);
                // split 2 page image
                if (theDirSplit.list().length <= document.getNumberOfPages()) {
                    try {
                        splitImage(document,checkFile, theDirSplit, fileExtension, theDir, watermarkDirectory, document.getNumberOfPages()/2);
                    } catch (IOException e) {
                        System.out.println("ERROR SPLIT PDF " + e.getMessage());
                        e.printStackTrace();
                    }
                }
                res.setTotalPages(document.getNumberOfPages());
                document.close();
                return new ResponseEntity<>(res, HttpStatus.OK);
            }
        } else {
            res.setTotalPages(1);
            return new ResponseEntity<>(res, HttpStatus.OK);
        }

这是调用 split 方法的代码....

Answer 1

这个问题有些丢失，但原因是未能关闭由 splitter.split() 生成的文档。

警告：您在 renderImageWithDPI 时没有关闭循环的 PDF 文档

Warning: You did not close a PDF Document looping when renderImageWithDPI

java

pdf

spring

pdfbox

spring-boot