Apache pdfbox .doc 到 .pdf 的转换

Question

我正在尝试将.doc 转换为.pdf，但是我遇到了这个异常，我不知道如何解决它。

java.io.IOException: Missing root object specification in trailer
at   org.apache.pdfbox.pdfparser.COSParser.parseTrailerValuesDynamically(COSParser.java:2042)

这是抛出异常的地方：

PDDocument pdfDocument = PDDocument.load(convertDocToPdf(documentInputStream));

这是我的转换方法：

private byte[] convertDocToPdf(InputStream documentInputStream) throws Exception {
    Document document = null;
    WordExtractor we = null;
    ByteArrayOutputStream out = null;
    byte[] documentByteArray = null;
    try {
        document = new Document();
        POIFSFileSystem fs = new POIFSFileSystem(documentInputStream);

        HWPFDocument doc = new HWPFDocument(fs);
        we = new WordExtractor(doc);
        out = new ByteArrayOutputStream();
        PdfWriter writer = PdfWriter.getInstance(document, out);

        Range range = doc.getRange();
        document.open();
        writer.setPageEmpty(true);
        document.newPage();
        writer.setPageEmpty(true);

        String[] paragraphs = we.getParagraphText();
        for (int i = 0; i < paragraphs.length; i++) {
            org.apache.poi.hwpf.usermodel.Paragraph pr = range.getParagraph(i);
            paragraphs[i] = paragraphs[i].replaceAll("\\cM?\r?\n", "");
            document.add(new Paragraph(paragraphs[i]));
        }
        documentByteArray = out.toByteArray();
    } catch (Exception ex) {
        ex.printStackTrace(System.out);
        throw new Exception(STATE.FAILED_CONVERSION.name());
    } finally {
        document.close();
        try {
            we.close();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return documentByteArray;
}

Answer 1

你使用 iText 类并做

documentByteArray = out.toByteArray();

在你完成文档之前

document.close();

因此，documentByteArray 仅包含 PDFBox 抱怨的不完整 PDF。