private static byte[] SetWatermark(WatermarkSetting waterMark, byte[] bytes)
{
if (waterMark == null || string.IsNullOrEmpty(waterMark.Text))
{
return(bytes);
}
var gs = new PdfGState();
var pdfReder = new PdfReader(bytes);
var fileName = DateTime.Now.ToFileTime() + Guid.NewGuid().ToString() + ".pdf";
var outPutPdfPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Configs", fileName);
var pdfStamper = new PdfStamper(pdfReder, new FileStream(outPutPdfPath, FileMode.Create));
try
{
var fontPath = AppConfig.GetFileByAbsolutePath("STCAIYUN.TTF");
var font = BaseFont.CreateFont(fontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
for (var i = 1; i <= pdfReder.NumberOfPages; i++)
{
var width = pdfReder.GetPageSize(i).Width;
var height = pdfReder.GetPageSize(i).Height;
var content = pdfStamper.GetOverContent(i);
//透明度
gs.FillOpacity = 0.4f;
content.SetGState(gs);
//开始写入文本
content.BeginText();
content.SetColorFill(BaseColor.BLACK);
content.SetFontAndSize(font, waterMark.Size);
content.SetTextMatrix(5, 10);
content.ShowTextAligned(Element.ALIGN_CENTER, waterMark.Text, width / 2, height / 2 - 50, 35);
content.SetColorFill(BaseColor.BLACK);
content.EndText();
}
}
catch (Exception)
{
return(bytes);
}
finally
{
pdfStamper.Close();
pdfReder.Close();
}
return(GetFileBytes(outPutPdfPath));
}
/// <summary>
/// 将Html文字 输出到PDF档里
/// </summary>
/// <param name="htmlText">html文本</param>
/// <param name="param">pdf大小</param>
/// <param name="waterMark">水印</param>
/// <param name="stampPoint">模拟盖章</param>
/// <returns></returns>
public static byte[] ConvertHtmlTextToPdf(string htmlText, DocumentParam param, WatermarkSetting waterMark = null, StampPoint stampPoint = null)
{
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.ToCharArray()); //字串转成byte[]
MemoryStream msInput = new MemoryStream(data);
Document doc = new Document(param.PageSize, param.MarginLeft, param.MarginRight, param.MarginTop, param.MarginBottom);; //要写PDF的文件，建构子没填的话预设直式A4
PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
//writer.SetViewerPreferences(PdfWriter.HideMenubar | PdfWriter.HideToolbar);
//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();
if (stampPoint != null && !string.IsNullOrEmpty(stampPoint.Path))
{
var img = Image.GetInstance(stampPoint.Path);
img.SetAbsolutePosition(doc.PageSize.Width - img.Width - stampPoint.X, img.Height + stampPoint.Y);
doc.Add(img);
}
//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
var action = PdfAction.GotoLocalPage(1, pdfDest, writer);
writer.SetOpenAction(action);
doc.Close();
msInput.Close();
outputStream.Close();
return(SetWatermark(waterMark, outputStream.ToArray()));
}
