C#根據html產生PDF

標籤：c#產生pdf   html產生pdf   

使用iTextSharp 控制項

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();            //從網址下載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>        /// 判斷是否有亂碼        /// </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>        /// 擷取網站內容，包含了 HTML+CSS+JS        /// </summary>        /// <returns>String返回網頁資訊</returns>        public string getWebContent()        {            try            {                WebClient MyWebClient = new WebClient();                MyWebClient.Credentials = CredentialCache.DefaultCredentials;                //擷取或設定用於向Internet資源的請求進行身分識別驗證的網路憑據                Byte[] pageData = MyWebClient.DownloadData(INPATH);                //從指定網站下載資料                string pageHtml = Encoding.UTF8.GetString(pageData);                //如果擷取網站頁面採用的是GB2312，則使用這句                       bool isBool = isMessyCode(pageHtml);//判斷使用哪種編碼 讀取網頁資訊                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>        /// 將Html文字 輸出到PDF檔裡        /// </summary>        /// <param name="htmlText"></param>        /// <returns></returns>        public byte[] ConvertHtmlTextToPDF(string htmlText)        {            if (string.IsNullOrEmpty(htmlText))            {                return null;            }            //避免當htmlText無任何html tag標籤的純文字時，轉PDF時會掛掉，所以一律加上<p>標籤            htmlText = "<p>" + htmlText + "</p>";            MemoryStream outputStream = new MemoryStream();//要把PDF寫到哪個串流            byte[] data = Encoding.UTF8.GetBytes(htmlText);//字串轉成byte[]            MemoryStream msInput = new MemoryStream(data);            Document doc = new Document();//要寫PDF的檔案，建構子沒填的話預設直式A4            PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);            //指定檔案預設開檔時的縮放為100%            PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);            //開啟Document檔案             doc.Open();            //使用XMLWorkerHelper把Html parse到PDF檔裡            // XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());            XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8);            //將pdfDest設定的資料寫到PDF檔            PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);            writer.SetOpenAction(action);            doc.Close();            msInput.Close();            outputStream.Close();            //回傳PDF檔案             return outputStream.ToArray();        }        //設定字型類        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 標楷體Path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),            "KAIU.TTF");//標楷體            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或標楷體，自己選一個                BaseFont baseFont = BaseFont.CreateFont(標楷體Path, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);                return new Font(bfChiness, size, style, color);            }        }    }}

C#根據html產生PDF