dependencies {
	compile ('org.docx4j:docx4j:2.8.1')
Java Code
public class Doc4JDoc2PDF {
    public static void main(String[] args) throws Exception {
        InputStream in = Doc4JDoc2PDF.class.getClassLoader().getResourceAsStream("input/doc4J-input.docx");
        OutputStream out = new FileOutputStream(new File("src/main/resources/output/doc4J-output.pdf"));
        long start = System.currentTimeMillis();
        createPDF(in, out);
        out.close();
        System.err.println("*********Take " + (System.currentTimeMillis() - start) + " ms*********");
    private static void createPDF(InputStream inputStream, OutputStream out) throws Exception {
        WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(inputStream);
        PdfSettings pdfSettings = new PdfSettings();
        PdfConversion converter = new org.docx4j.convert.out.pdf.viaXSLFO.Conversion(
                wordMLPackage);
        converter.output(out, pdfSettings);
// *********Take 8934 ms*********
xdocreport + xwpf

Dependency
dependencies{
    compile('fr.opensagres.xdocreport:fr.opensagres.xdocreport.template.velocity:2.0.1')
    compile('fr.opensagres.xdocreport:fr.opensagres.xdocreport.document.docx:2.0.1')
    compile('fr.opensagres.xdocreport:fr.opensagres.poi.xwpf.converter.pdf:2.0.1')
Java Code
public class XWPFDoc2PDF {
    public static void main(String[] args) throws Exception {
        InputStream in = XWPFDoc2PDF.class.getClassLoader().getResourceAsStream("input/xwpf-input.docx");
        File outputFile = new File("src/main/resources/output/xwpf-output.docx");
        OutputStream out = new FileOutputStream(outputFile);
        long start = System.currentTimeMillis();
        replaceTemplate(in, out);
        out.close();
        InputStream in1 = XWPFDoc2PDF.class.getClassLoader().getResourceAsStream("output/xwpf-output.docx");
        OutputStream out1 = new FileOutputStream(new File("src/main/resources/output/xwpf-output.pdf"));
        docToPDF(in1, out1);
        out1.close();
        System.err.println("*********Take " + (System.currentTimeMillis() - start) + " ms*********");
        System.exit(0);
    private static void replaceTemplate(InputStream in, OutputStream out) throws Exception {
        IXDocReport report = XDocReportRegistry.getRegistry().loadReport(in, TemplateEngineKind.Velocity);
        IContext context = report.createContext();
        context.put("current_date", "2017-09-09");
        context.put("buyer_name", "袁慎建");
        report.process(context, out);
        out.close();
    public static void docToPDF(InputStream in, OutputStream out) throws Exception {
        XWPFDocument document = new XWPFDocument(in);
        PdfOptions options = PdfOptions.create().fontEncoding("utf-8");
        PdfConverter.getInstance().convert(document, out, options);
// *********Take 4756 ms*********
xdocreport + odfdom

Dependency
dependencies{
	compile('fr.opensagres.xdocreport:fr.opensagres.xdocreport.document.odt:2.0.1')
	compile('fr.opensagres.xdocreport:fr.opensagres.xdocreport.template.velocity:2.0.1')
	compile('fr.opensagres.xdocreport:fr.opensagres.xdocreport.converter.odt.odfdom:2.0.1')
Java Code
public class XDocReportDoc2PDF {
    public static void main(String[] args) throws Exception {
        InputStream in = XDocReportDoc2PDF.class.getClassLoader().getResourceAsStream("input/xdocreport-input.odt");
        OutputStream out = new FileOutputStream(new File("src/main/resources/output/xdocreport-output.pdf"));
        long start = System.currentTimeMillis();
        odtToPDFWithVelocity(in, out);
        out.close();
        System.err.println("*********Take " + (System.currentTimeMillis() - start) + " ms*********");
        System.exit(0);
    private static void odtToPDFWithVelocity(InputStream in, OutputStream out) throws Exception {
        IXDocReport report = XDocReportRegistry.getRegistry().loadReport(in, TemplateEngineKind.Velocity);
        IContext ctx = report.createContext();
        Invoice invoice = generateInvoice();
        User sender = generateUser();
        User to = generateUser();
        ctx.put("invoice", invoice);
        ctx.put("StringUtils", StringUtils.class);
        ctx.put("to", to);
        ctx.put("sender", sender);
        List<InvoiceRow> rows = new ArrayList<>();
        rows.add(generateInvoiceRow());
        rows.add(generateInvoiceRow());
        ctx.put("rows", rows);
        Options options = Options.getTo(ConverterTypeTo.PDF).via(ConverterTypeVia.ODFDOM);
        report.convert(ctx, options, out);
// *********Take 13696 ms*********
jodconverter + openoffice

Dependency
dependencies{
    compile files('libs/jodconverter-core-3.0-beta-4.jar')
jodconverter依赖下载地址: https://code.google.com/archive/p/jodconverter/downloads
Java Code
public class OpenOfficeToPDF {
    public static void main(String[] args) throws Exception {
        DefaultOfficeManagerConfiguration configuration = new DefaultOfficeManagerConfiguration();
        configuration.setPortNumber(8100);
        configuration.setRetryTimeout(1000);
        configuration.setOfficeHome("/Applications/OpenOffice.app/Contents");
        OfficeManager officeManager = configuration.buildOfficeManager();
        OfficeDocumentConverter documentConverter = new OfficeDocumentConverter(officeManager);
        officeManager.start();
        File sourceFile = new File("/Users/sjyuan/Personal-sjyuan/IdeaProjects/springboot-html-pdf/src/main/resources/input/openoffice-input.odt");
        File outputFile = new File("src/main/resources/output/openoffice-output.pdf");
        createPDF(documentConverter, sourceFile, outputFile);
        officeManager.stop();
    private static void createPDF(OfficeDocumentConverter converter, File sourceFile, File outputFile) throws Exception {
        long start = System.currentTimeMillis();
        converter.convert(sourceFile, outputFile);
        System.err.println("Generate pdf/HelloWorld.pdf with "
                + (System.currentTimeMillis() - start) + "ms");
安装 Openoffice
进入安装目录
$ /Applications/OpenOffice.app/Contents/program
$ ./soffice -headless -accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard
Aspose

Dependency
dependencies{
	compile files('libs/aspose-words-17.10-jdk16.jar')
aspose依赖下载地址: https://www.aspose.com/community/getting-started.aspx
Java Code
public class AsposeDoc2PDF {
    public static void main(String[] args) throws Exception {
        documentToPDFWithAspose("/Users/sjyuan/Personal-sjyuan/IdeaProjects/springboot-html-pdf/src/main/resources/input/aspose-input.odt",
                "src/main/resources/output/aspose-output.pdf");
    public static void documentToPDFWithAspose(String absoluteSourceFilePath, String savedFilePath) throws Exception {
        Document doc = new Document(absoluteSourceFilePath);
        doc.save(savedFilePath, SaveFormat.PDF); //Save the document in PDF format.
另辟蹊径(XHTML/HTML -> PDF)

thymeleaf + flying-saucer-pdf?

利于开发者维护。
可以并行修改文件。
商业合同对尺寸要求苛刻，css样式较难调整。
thymeleaf + wkhtmltopdf?

利于开发者维护。
可以并行修改文件。
已经有成功的生产实践。
合同对尺寸要求苛刻，css样式较难调整。
How to convert docx/odt to pdf/html with Java?
How to Run LibreOffice in AWS Lambda for Dirty-Cheap PDFs at Scale