C#根据html生成PDF

使用iTextSharp 控件

using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using iTextSharp.text;using iTextSharp.text.pdf;using System.IO;using iTextSharp.tool.xml;using System.Text;using System.Net;namespace PDFTools{    public partial class CreatePdf : System.Web.UI.Page    {        string INPATH = System.Web.HttpContext.Current.Server.MapPath("~/bin/temp.html");        protected void Page_Load(object sender, EventArgs e)        {            string path = System.Web.HttpContext.Current.Server.MapPath("~/UploadPdf");            if (!Directory.Exists(path))                Directory.CreateDirectory(path);            WebClient wc = new WebClient();            //从网址下载Html字串            wc.Encoding = System.Text.Encoding.UTF8;            string htmlText = getWebContent();            byte[] pdfFile = this.ConvertHtmlTextToPDF(htmlText);            string fileId = "/file_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";            System.IO.File.WriteAllBytes(path + fileId, pdfFile);        }        /// <summary>        /// 判断是否有乱码        /// </summary>        /// <param name="txt"></param>        /// <returns></returns>        public bool isMessyCode(string txt)        {            var bytes = Encoding.UTF8.GetBytes(txt);            //239 191 189                        for (var i = 0; i < bytes.Length; i++)            {                if (i < bytes.Length - 3)                    if (bytes[i] == 239 && bytes[i + 1] == 191 && bytes[i + 2] == 189)                    {                        return true;                    }            }            return false;        }        /// <summary>        /// 获取网站内容，包含了 HTML+CSS+JS        /// </summary>        /// <returns>String返回网页信息</returns>        public string getWebContent()        {            try            {                WebClient MyWebClient = new WebClient();                MyWebClient.Credentials = CredentialCache.DefaultCredentials;                //获取或设置用于向Internet资源的请求进行身份验证的网络凭据                Byte[] pageData = MyWebClient.DownloadData(INPATH);                //从指定网站下载数据                string pageHtml = Encoding.UTF8.GetString(pageData);                //如果获取网站页面采用的是GB2312，则使用这句                       bool isBool = isMessyCode(pageHtml);//判断使用哪种编码 读取网页信息                if (!isBool)                {                    string pageHtml1 = Encoding.UTF8.GetString(pageData);                    pageHtml = pageHtml1;                }                else                {                    string pageHtml2 = Encoding.Default.GetString(pageData);                    pageHtml = pageHtml2;                }                return pageHtml;            }            catch (WebException webEx)            {                Console.WriteLine(webEx.Message.ToString());                return webEx.Message;            }        }        /// <summary>        /// 将Html文字 输出到PDF档里        /// </summary>        /// <param name="htmlText"></param>        /// <returns></returns>        public 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);            //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());            XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8);            //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();            //回传PDF档案             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。            private static readonly string 标楷体Path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),            "KAIU.TTF");//标楷体            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(标楷体Path, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);                return new Font(bfChiness, size, style, color);            }        }    }}