Apache POI - DOCX 到 PDF 转换

Question

我正在尝试使用 POI 将 docx 文件转换为 pdf 文件。出现以下错误。 使用 poi-3.17 ，

  import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import org.apache.poi.xwpf.converter.pdf.PdfConverter;
    import org.apache.poi.xwpf.converter.pdf.PdfOptions;
    import org.apache.poi.xwpf.usermodel.XWPFDocument;
    
    public class WordToPDF {
    
        public static void main(String[] args) {
            WordToPDF cwoWord = new WordToPDF();
            System.out.println("Start");
            cwoWord.ConvertToPDF("D:\\2067536.docx", "D:\\2067536.pdf");
        }
    
        public void ConvertToPDF(String docPath, String pdfPath) {
            try {
                InputStream doc = new FileInputStream(new File(docPath));
                XWPFDocument document = new XWPFDocument(doc);
                document.createStyles();
                PdfOptions options = PdfOptions.create();
                OutputStream out = new FileOutputStream(new File(pdfPath));
                PdfConverter.getInstance().convert(document, out, options);
                System.out.println("Done");
            } catch (FileNotFoundException ex) {
                System.out.println(ex.getMessage());
            } catch (IOException ex) {
    
                System.out.println(ex.getMessage());
            }
        }
    
    }

这是发生的错误

Exception in thread "main" org.apache.poi.xwpf.converter.core.XWPFConverterException: java.lang.NullPointerException
        at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:70)
        at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:38)
        at org.apache.poi.xwpf.converter.core.AbstractXWPFConverter.convert(AbstractXWPFConverter.java:45)
        at WordToPDF.ConvertToPDF(WordToPDF.java:27)
        at WordToPDF.main(WordToPDF.java:17)
Caused by: java.lang.NullPointerException
        at org.apache.poi.xwpf.converter.pdf.internal.PdfMapper.visitHeader(PdfMapper.java:178)
        at org.apache.poi.xwpf.converter.pdf.internal.PdfMapper.visitHeader(PdfMapper.java:111)
        at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.visitHeaderRef(XWPFDocumentVisitor.java:1142)
        at org.apache.poi.xwpf.converter.core.MasterPageManager.visitHeadersFooters(MasterPageManager.java:213)
        at org.apache.poi.xwpf.converter.core.MasterPageManager.addSection(MasterPageManager.java:180)
        at org.apache.poi.xwpf.converter.core.MasterPageManager.compute(MasterPageManager.java:127)
        at org.apache.poi.xwpf.converter.core.MasterPageManager.initialize(MasterPageManager.java:90)
        at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.visitBodyElements(XWPFDocumentVisitor.java:232)
        at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.start(XWPFDocumentVisitor.java:199)
        at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:56)
        ... 4 more

由于这是一个空指针错误，我无法理解究竟是什么问题，感谢任何帮助。谢谢。

Answer 1

Libre Office 救了我的命，一个简单的 docx 到 pdf 转换的线性命令就像一个魅力。

这里有详细解答

Command `libreoffice --headless --convert-to pdf test.docx --outdir /pdf` is not working

Answer 2

我用spire.doc for java把docx文件转成pdf，你可以试试。 https://www.e-iceblue.com/Tutorials/Java/Spire.Doc-for-Java/Program-Guide/Conversion/Convert-Word-to-PDF-in-Java.html

import com.spire.doc.Document;
import com.spire.doc.FileFormat;
import com.spire.doc.ToPdfParameterList;

public class WordToPDF {
   public static void main(String[] args)  {

      //Create Document object
      Document doc = new Document();

      //Load the file from disk.
      doc.loadFromFile("Sample.docx");

      //create an instance of ToPdfParameterList.
      ToPdfParameterList ppl=new ToPdfParameterList();

      //embeds full fonts by default when IsEmbeddedAllFonts is set to true.
      ppl.isEmbeddedAllFonts(true);

      //set setDisableLink to true to remove the hyperlink effect for the result PDF page.
      //set setDisableLink to false to preserve the hyperlink effect for the result PDF page.
      ppl.setDisableLink(true);

      //Set the output image quality as 40% of the original image. 80% is the default setting.
      doc.setJPEGQuality(40);

      //Save to file.
      doc.saveToFile("output/ToPDF.pdf",FileFormat.PDF);
  }

}