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  • PDF文档导出

    代码如下:
    /// <summary>
    /// 获取html内容,转成PDF(注册)
    
    /// </summary>
    public void DownloadPDFByHTML(string html,string FileName)
    {
    
    
    WebClient wc = new WebClient();
    //
    wc.Encoding = System.Text.Encoding.UTF8;
    //string htmlText = getWebContent();
    string htmlText = html;//getWebContent();
    
    string DataName = FileName;//下载文件名
    
    byte[] pdfFile =ConvertHtmlTextToPDF(htmlText);
    
    //如果需要保存到服务器
    //string fileId = "/file_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf";
    //System.IO.File.WriteAllBytes(path + fileId, pdfFile);
    Response.ContentType = "application/octet-stream";
    //通知浏览器下载文件
    Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(DataName + ".pdf", System.Text.Encoding.UTF8));
    Response.BinaryWrite(pdfFile);//文件下载二进制流
    Response.Flush();
    Response.End();
    ////删除服务器文件,通知下载成功之后,删除
    //FileInfo fi = new FileInfo(path + fileId);
    //if (fi.Exists)
    //{
    // fi.Delete();
    //}
    }
    
    /// <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
    {
    string INPATH = System.Web.HttpContext.Current.Server.MapPath("~/EmailTemplet/sa.html");
    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> 
    /// 判断是否有乱码 
    /// </summary> 
    /// <param name="txt"></param> 
    /// <returns></returns> 
    public static bool isMessyCode(string txt)
    {
    var bytes = Encoding.UTF8.GetBytes(txt);
    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> 
    /// 将Html文字 输出到PDF档里 
    /// </summary> 
    /// <param name="htmlText"></param> 
    /// <returns></returns> 
    public 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(PageSize.A4.Rotate(), 1, 1, 1, 1);//要写PDF的文件,建构子没填的话预设直式A4(括号内不填写值默认是A4纵向,否则是横向)
    
    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();
    doc.Add(iTextSharp.text.PageSize.A5.Rotate());
    //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 (如果字体设置有问题,只能显示英文)
    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 FontTypePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts),
    "STKAITI.TTF");
    
    
    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\STKAITI.TTF", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
    //可用Arial或标楷体,自己选一个 
    BaseFont baseFont = BaseFont.CreateFont(FontTypePath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
    return new Font(bfChiness, size, style, color);
    }
    }
    

      

    以上是代码,直接调用DownloadPDFByHTML()该方法,代码需要引用两个dll文件,itextsharp.dll和itextsharp.xmlworker.dll  下载

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  • 原文地址:https://www.cnblogs.com/zhurunlai/p/7193201.html
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