<!-- html轉PDF -->
    <dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>kernel</artifactId>
        <version>7.1.1</version>
    </dependency>
    
    <dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>layout</artifactId>
        <version>7.1.1</version>
    </dependency>
    
    <dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>html2pdf</artifactId>
        <version>2.0.1</version>
    </dependency>

public class ItextPDFUtil {

    public static void main(String[] args) {
        String htmlStr = null;
        InputStream inputStream = null;
        PdfDocument pd = null;
        try {
            // 讀取html的流
            inputStream = new FileInputStream(new File("F:/協議.html"));

            // 流轉換成字串
            StringBuffer out = new StringBuffer();
            byte[] b = new byte[4096];
            for (int n; (n = inputStream.read(b)) != -1;) {
                out.append(new String(b, 0, n));
            }

            htmlStr = out.toString();
            String pdffile = "F:/test.pdf";

            pd = new PdfDocument(new PdfWriter(new FileOutputStream(new File(pdffile))));
            // 設定檔案標題為fileName，web上展示的標題為此標題
            pd.getDocumentInfo().setTitle(pdffile);
        }
        catch (Exception e) {
            e.printStackTrace();
        }

        Document document = new Document(pd, PageSize.A4);
        try {
            // 匯入字型
            FontProvider font = new FontProvider();
            font.addFont("F:/SimSun.ttf");

            ConverterProperties c = new ConverterProperties();
            c.setFontProvider(font);
            c.setCharset("utf-8");

            // 設定頁面邊距 必須先設定邊距，再新增內容，否則頁邊距無效
            document.setMargins(50, 0, 50, 0);
            List<IElement> list = HtmlConverter.convertToElements(htmlStr, c);
            for (IElement ie : list) {
                document.add((IBlockElement) ie);
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            document.close();
        }

    }

    public static void htmlToPdf(String html, OutputStream outStream, String fontPath) {
        PdfDocument pd = null;
        Document document = null;
        try {
            pd = new PdfDocument(new PdfWriter(outStream));

            // 匯入字型
            FontProvider font = new FontProvider();
            font.addStandardPdfFonts();
            font.addFont(fontPath);
            ConverterProperties c = new ConverterProperties();
            c.setFontProvider(font);
            c.setCharset("utf-8");

            // 設定頁面邊距 必須先設定邊距，再新增內容，否則頁邊距無效
            document = new Document(pd, PageSize.A4, true);
            document.setMargins(50, 0, 40, 0);
            List<IElement> list = HtmlConverter.convertToElements(html, c);
            for (IElement ie : list) {
                document.add((IBlockElement) ie);
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            document.close();
        }

    }