pdf转换

Posted 2021-01-25 muxueyuan

namespace Utilities
{
    public static class PDFHelper
    {

        /// <summary>
        /// html转Pdf
        /// </summary>
        /// <param name="strHtmlData">HTML内容</param>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名</param>
        public static bool HtmlToPdfByInfo(string strHtmlData, string filePath, string fileName)
        {
            FileStream fs = null;
            try
            {
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                //获得字节数组
                byte[] bPDF = ConvertHtmlTextToPDF(strHtmlData);

                if (bPDF == null)
                {
                    return false;
                }


                fs = new FileStream(Path.Combine(filePath, fileName), FileMode.Create);

                //开始写入
                fs.Write(bPDF, 0, bPDF.Length);
                return true;
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                //清空缓冲区、关闭流
                if (fs != null)
                {
                    fs.Flush();
                    fs.Close();
                }
            }
        }


        public static bool DownLoadFile(string url, string filePath, string fileName)
        {
            try
            {
                WebClient wc = new WebClient();
                wc.Encoding = System.Text.Encoding.UTF8;
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                wc.DownloadFile(url, Path.Combine(filePath, fileName));

                return true;
            }
            catch (Exception ex)
            {
                string strLog = string.Format("下载文件名：{0}；文件下载地址：{1}；错误信息：{2}。", fileName, url, ex.StackTrace);
                LogHelper.Info(strLog);
                throw ex;
            }

        }

        #region HTML模板方式转PDF(格式问题)
        /// <summary>
        /// Html转Pdf
        /// </summary>
        /// <param name="url">页面地址，要完整地址</param>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名</param>
        public static bool HtmlToPdf(string url, string filePath, string fileName)
        {
            FileStream fs = null;
            try
            {
                WebClient wc = new WebClient();
                wc.Encoding = System.Text.Encoding.UTF8;
                //从网址下载Html字串
                string htmlText = wc.DownloadString(url);

                //StreamWriter TxtWriter = new StreamWriter(@"D:logfile.txt", true);
                //TxtWriter.Write("0" + Environment.NewLine);
                //TxtWriter.Write(htmlText + Environment.NewLine);
                //TxtWriter.Close();

                //获得字节数组
                byte[] bPDF = ConvertHtmlTextToPDF(htmlText);

                if (bPDF == null)
                {
                    return false;
                }

                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                fs = new FileStream(Path.Combine(filePath, fileName), FileMode.Create);

                //开始写入
                fs.Write(bPDF, 0, bPDF.Length);

                return true;
            }
            catch (Exception ex)
            {
                string strLog = string.Format("HTML模板方式转PDF 文件名：{0}；文件下载地址：{1}；错误信息：{2}。", fileName, url, ex.StackTrace);
                LogHelper.Info(strLog);
                throw ex;
            }
            finally
            {
                //清空缓冲区、关闭流
                if (fs != null)
                {
                    fs.Flush();
                    fs.Close();
                }
            }
        }
        #endregion

        private static byte[] ConvertHtmlTextToPDF(string htmlText)
        {
            if (string.IsNullOrEmpty(htmlText))
            {
                return null;
            }
            //避免当htmlText无任何html tag标签的纯文字时，转PDF时会挂掉，所以一律加上<p>标签
            //htmlText = "<p>" + htmlText + "</p>";


            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);

            //PageEventHelper pageEventHelper = new PageEventHelper();
            //writer.PageEvent = pageEventHelper;
            //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);
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());

            //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);

            ////手工加内容
            //doc.NewPage();
            ////要先定义中文字体
            //BaseFont BF_Light = BaseFont.CreateFont(@"C:WindowsFontssimsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            ////要设置字体和大小
            //var p = new Paragraph("合同信息", new Font(BF_Light, 13));
            //PdfPTable table = new PdfPTable(1);
            //PdfPCell cell = new PdfPCell(p);
            ////设置cell属性
            //cell.HorizontalAlignment = Element.ALIGN_CENTER;
            ////添加单元格
            //table.AddCell(cell);
            //doc.Add(table);

            doc.Close();
            msInput.Close();
            outputStream.Close();
            //回传PDF档案 
            return outputStream.ToArray();
        }


        #region 创建PDF文档 
        /// <summary>
        /// 生成PDF
        /// </summary>
        /// <param name="strHtmlData">HTML内容</param>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名</param>
        public static bool CreatePdf(string filePath, string fileName, PdfPTable dt)
        {
            FileStream fs = null;
            try
            {
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                //获得字节数组 
                byte[] bPDF = CreatePdf(dt);

                if (bPDF == null)
                {
                    return false;
                }


                fs = new FileStream(Path.Combine(filePath, fileName), FileMode.Create);

                //开始写入
                fs.Write(bPDF, 0, bPDF.Length);
                return true;
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                //清空缓冲区、关闭流
                if (fs != null)
                {
                    fs.Flush();
                    fs.Close();
                }
            }
        }



        /// <summary>
        /// 创建PDF
        /// </summary>
        /// <param name="htmlText"></param>
        /// <returns></returns>
        private static byte[] CreatePdf(PdfPTable pdfTable)
        {
            MemoryStream outputStream = new MemoryStream();//要把PDF写到哪个串流  
            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();
            //将pdfDest设定的资料写到PDF档
            PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
            writer.SetOpenAction(action);

            //手工加内容
            doc.NewPage();
            doc.Add(pdfTable);

            var row = pdfTable.Rows[pdfTable.Rows.Count];
            //iTextSharp.text.Image splitline = iTextSharp.text.Image.GetInstance(@"E:WorkCodesYeWuYCloud.MFBP.WebImagesyaoshi.png");
            //splitline.ScalePercent(12f);  //图片比例
            //splitline.SetAbsolutePosition(doc.PageSize.Width- doc.PageSize.Width/3*2, doc.PageSize.Height - doc.PageSize.Height/5*4);

            doc.Close();
            outputStream.Close();
            //回传PDF档案 
            return outputStream.ToArray();
        }

        #endregion
    }

    public class UnicodeFontFactory : FontFactoryImp
    {
        static string fontPath = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);

        //arial unicode MS是完整的unicode字型。
        //private static readonly string arialFontPath = Path.Combine(fontPath, "arialuni.ttf");
        //宋体。
        private static readonly string stFontPath = Path.Combine(fontPath, "simsun.ttc,0");

        public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color, bool cached)
        {
            BaseFont baseFont = BaseFont.CreateFont(stFontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            return new Font(baseFont, size, style, color);
        }
    }

    public class PageEventHelper : PdfPageEventHelper
    {
        PdfContentByte cb;
        PdfTemplate template;


        public override void OnOpenDocument(PdfWriter writer, Document document)
        {
            cb = writer.DirectContent;
            template = cb.CreateTemplate(100, 50);
        }

        public override void OnStartPage(PdfWriter writer, Document document)
        {
            base.OnStartPage(writer, document);
        }

        public override void OnEndPage(PdfWriter writer, Document document)
        {
            base.OnEndPage(writer, document);

            String text = "第" + writer.PageNumber.ToString() + "页";

            UnicodeFontFactory info = new UnicodeFontFactory();
            float len = 10;
            iTextSharp.text.Rectangle pageSize = document.PageSize;
            cb.SetRGBColorFill(100, 100, 100);

            string fontPath = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);
            string stFontPath = Path.Combine(fontPath, "simsun.ttc,0");
            BaseFont baseFont = BaseFont.CreateFont(stFontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

            cb.BeginText();
            cb.SetFontAndSize(baseFont, 10);
            cb.SetTextMatrix(document.LeftMargin, pageSize.GetBottom(document.BottomMargin));
            cb.ShowText(text);

            cb.EndText();

            cb.AddTemplate(template, document.LeftMargin + len, pageSize.GetBottom(document.BottomMargin));
        }

        public override void OnCloseDocument(PdfWriter writer, Document document)
        {
            base.OnCloseDocument(writer, document);

            string fontPath = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);
            string stFontPath = Path.Combine(fontPath, "simsun.ttc,0");
            BaseFont baseFont = BaseFont.CreateFont(stFontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

            template.BeginText();
            template.SetFontAndSize(baseFont, 10);
            template.SetTextMatrix(12, 0);
            template.ShowText("共" + writer.PageNumber + "页");
            template.EndText();
        }

    }

}