java docx 转pdf

可以使用Apache POI和Apache PDFBox来实现Java Docx转PDF的功能。下面是一个简单的示例代码：

import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.edit.PDPageContentStream;
import org.apache.pdfbox.util.PDFMergerUtility;

public class DocxToPdfConverter {
    public static void convert(String docxFilePath, String pdfFilePath) throws Exception {
        // Load DOCX file
        XWPFDocument document = new XWPFDocument(new FileInputStream(docxFilePath));

        // Create PDF document
        PDDocument pdfDocument = new PDDocument();

        // Loop through all paragraphs in the DOCX file
        for (XWPFParagraph paragraph : document.getParagraphs()) {
            // Create a new page in the PDF document
            PDPage page = new PDPage();
            pdfDocument.addPage(page);

            // Start a new content stream for the page
            PDPageContentStream contentStream = new PDPageContentStream(pdfDocument, page);

            // Add the paragraph text to the page
            contentStream.beginText();
            contentStream.setFont(PDType1Font.TIMES_ROMAN, 12);
            contentStream.moveTextPositionByAmount(50, 700);
            contentStream.drawString(paragraph.getText());
            contentStream.endText();

            // Close the content stream for the page
            contentStream.close();
        }

        // Save the PDF document
        pdfDocument.save(pdfFilePath);

        // Merge all pages into a single PDF file
        PDFMergerUtility merger = new PDFMergerUtility();
        merger.setDestinationFileName(pdfFilePath);
        for (int i = 0; i < pdfDocument.getNumberOfPages(); i++) {
            merger.addSource(pdfFilePath);
        }
        merger.mergeDocuments();

        // Close the PDF document
        pdfDocument.close();
    }
}

在上面的示例中，我们首先加载DOCX文件，然后创建一个空的PDF文档。接下来，我们循环遍历DOCX文件中的所有段落，并将它们添加到PDF文档中的新页面中。最后，我们将所有页面合并为单个PDF文件，并保存该文件。