itextpdf html轉pdf 中文字體問題

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

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

            String fntname = fontname;
            if (fntname == null) {
                fntname = "宋體";
            }
            //網上通常沒有這段代碼，致使系統沒有宋體的狀況中文不顯示，要把宋體文件放到資源文件裏
            registerFamily("宋體","宋體","/simsun.ttf");
            return super.getFont(fntname, encoding, size, style);
        }
    }
	
	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;
    }

}