itextpdf - 解决h5渲染一个cell内 中文不显示的问题

itextpdf 版本为 5.5.13

• 传统的方式，把h5渲染到里面后，中文不会显示

PdfPCell cell = new PdfPCell();
        cell.setColspan(3);
        cell.setRowspan(1);
        cell.setHorizontalAlignment(Element.ALIGN_LEFT);
        // h5渲染到cell
        String htmlContent = "<h1 style=\"font-size: 36pt;\">Hello, World!</h1><h2>我的</h2><p style=\"color: red;\">This is some HTML content.</p><img src=\"http://49.232.167.247:22038/vehicle-quality-review-oss/2024/04/11/1712827970222_20240411173255A009.jpg\" />";
        ElementList elementList = XMLWorkerHelper.parseToElementList(htmlContent, css);
        for (Element element ：elementList) {
        	cell.addElement(element);	
        }
        table.add(cell);

• 解决方案：重写XMLWorkerHelper的parseToElementList这个方法

PdfPCell cell = new PdfPCell();
        cell.setColspan(3);
        cell.setRowspan(1);
        cell.setHorizontalAlignment(Element.ALIGN_LEFT);
        // h5渲染到cell
        String htmlContent = "<h1 style=\"font-size: 36pt;\">Hello, World!</h1><h2>我的</h2><p style=\"color: red;\">This is some HTML content.</p><img src=\"http://49.232.167.247:22038/vehicle-quality-review-oss/2024/04/11/1712827970222_20240411173255A009.jpg\" />";
        ElementList elementList = parseToElementList(htmlContent, null);
        cell.addElement(new Paragraph().addAll(elementList));
        table.addCell(cell);

/**
     * html转pdf 写法
     * @param html
     * @param css
     * @return
     * @throws IOException
     */
    public static ElementList parseToElementList(String html, String css) throws IOException {
        // CSS
        CSSResolver cssResolver = new StyleAttrCSSResolver();
        if (css != null) {
            CssFile cssFile = XMLWorkerHelper.getCSS(new ByteArrayInputStream(css.getBytes()));
            cssResolver.addCss(cssFile);
        }

        // HTML
        MyFontsProvider fontProvider = new MyFontsProvider();
        CssAppliers cssAppliers = new CssAppliersImpl(fontProvider);
        HtmlPipelineContext htmlContext = new HtmlPipelineContext(cssAppliers);
        htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
        htmlContext.autoBookmark(false);

        // Pipelines
        ElementList elements = new ElementList();
        ElementHandlerPipeline end = new ElementHandlerPipeline(elements, null);
        HtmlPipeline htmlPipeline = new HtmlPipeline(htmlContext, end);
        CssResolverPipeline cssPipeline = new CssResolverPipeline(cssResolver, htmlPipeline);

        // XML Worker
        XMLWorker worker = new XMLWorker(cssPipeline, true);
        XMLParser p = new XMLParser(worker);
        html = html.replace("<br>", "").replace("<hr>", "").replace("<img>", "").replace("<param>", "").replace("<link>", "");
        p.parse(new ByteArrayInputStream(html.getBytes()));
        return elements;
    }

    static class MyFontsProvider extends XMLWorkerFontProvider {
        public MyFontsProvider() {
            super(null, null);
        }

        @Override
        public Font getFont(final String fontname, String encoding, float size, final int style) {
            return getFontInf();
        }
    }

    /**
     * 设置字体信息
     * @return
     */
    @SneakyThrows
    private static Font getFontInf() {
        // 字体路径
        String fontPath =  "/fonts/STSong.TTF";
        BaseFont baseFont = null;
        Font font = null;
        // 设置字体路径,字体编码，是否将字体嵌入pdf（默认false）
        baseFont = BaseFont.createFont(fontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        // 设置默认字体数据
        font = new Font(baseFont, 12f, Font.NORMAL,BaseColor.BLACK);
        return font;
    }