html字符串转pdf源码

        /// <summary>  
        /// 将Html文字 输出到PDF  
        /// </summary>  
        /// <param name="htmlText"></param>  
        /// <returns></returns>  
        public static byte[] ConvertHtmlTextToPDF(string htmlText)
        {
            if (string.IsNullOrEmpty(htmlText))
            {
                return null;
            }
            MemoryStream outputStream = new MemoryStream();//要把PDF写到哪个串流
            byte[] data = Encoding.UTF8.GetBytes(htmlText);//字串转成byte[]  
            MemoryStream msInput = new MemoryStream(data);
            Document doc = new Document();//要写PDF的文件，建构子没填的话预设直式A4  
            PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
            //指定文件预设开档时的缩放为100%  
            //PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
            //开启Document文件   
            doc.Open();


            //使用XMLWorkerHelper把Html parse到PDF档里  
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());


            //将pdfDest设定的资料写到PDF档  
            //PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
            //writer.SetOpenAction(action);
            doc.Close();
            msInput.Close();
            outputStream.Close();
            return outputStream.ToArray();
        }

        //设置字体类  
        public class UnicodeFontFactory : FontFactoryImp
        {
            private static readonly string arialFontPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),
      "arialuni.ttf");//arial unicode MS是完整的unicode字型。  
            public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color, bool cached)
            {
                BaseFont bfChiness = BaseFont.CreateFont(@"C:\Windows\Fonts\SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
                //可用Arial或标楷体，自己选一个  
                BaseFont baseFont = BaseFont.CreateFont(arialFontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                return new Font(bfChiness, size, style, color);
            }

        }