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@cjpsky
cjpsky authored Dec 12, 2020
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> 最新手上有个项目，需要导出pdf添加水印，网上可找的资料也有很多，我这里采用了iTextSharp.LGPLv2.Core版本库，代码整理了下分享给有需要的小伙伴。
> demo采用.net core 3.1
### 1.Nuget包

> iTextSharp.LGPLv2.Core
PM> Install-Package iTextSharp.LGPLv2.Core -Version 1.7.0
* 可以在项目中直接引用iTextSharp.LGPLv2.Core.dll就能使用；

```c#
using iTextSharp.text;
using iTextSharp.text.pdf;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace GeneratePDFDemo
{
public class GeneratePDF
{
/// <summary>
/// 转换成pdf
/// </summary>
/// <param name="model"></param>
/// <param name="request"></param>
/// <returns></returns>
public static string ObjectToPdf(ComparisonQuotaValue model, string filePath)
{
string currentDate = DateTime.Now.ToString("yyyyMMdd");
var uploadPath = filePath + $"/" + currentDate + "/";//>>>相当于HttpContext.Current.Server.MapPath("")
if (!Directory.Exists(uploadPath))
{
Directory.CreateDirectory(uploadPath);
}
//输出的文件名称
var _temp = DateTime.Now.ToString("yyyyMMddHHmmssffff");
string fileName = string.Format("{0}.pdf", $"{model.QuotaName}_" + _temp, Encoding.UTF8);
//string newFileName = string.Format("{0}_1.pdf", $"{obj.QuotaName}_" + _temp, Encoding.UTF8);
string pdfPath = uploadPath + "\\" + fileName;//自定义生成的pdf名
string newFilePath = "";

try
{
#region 定义字体样式

BaseFont bfChinese = BaseFont.CreateFont($"C://WINDOWS//fonts//simsun.ttc,1", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
Font fontChinese_12 = new Font(bfChinese, 18, Font.BOLD, new BaseColor(0, 0, 0));
Font fontChinese_11 = new Font(bfChinese, 14, Font.BOLD, new BaseColor(0, 0, 0));
Font fontChinese_10 = new Font(bfChinese, 10, Font.NORMAL, new BaseColor(248, 248, 255));
Font fontChinese_bold = new Font(bfChinese, 8, Font.BOLD, new BaseColor(0, 0, 0));
Font fontChinese_8 = new Font(bfChinese, 8, Font.NORMAL, new BaseColor(0, 0, 0));
Font fontChinese = new Font(bfChinese, 7, Font.NORMAL, new BaseColor(0, 0, 0));
//黑体
BaseFont bf_ht = BaseFont.CreateFont("C://WINDOWS//Fonts//simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
Font ht_7 = new Font(bf_ht, 7, Font.NORMAL, new BaseColor(0, 0, 0));

#endregion 定义字体样式

//行高
float cellHeight = 20;
//初始化一个目标文档类
Document document = new Document(PageSize.A4, 5f, 5f, 30f, 0f);
//调用PDF的写入方法流
//注意FileMode-Create表示如果目标文件不存在，则创建，如果已存在，则覆盖。
PdfWriter pdfWriter = PdfWriter.GetInstance(document, new FileStream(pdfPath, FileMode.Create));

// 页眉页脚
string space1 = " ".PadLeft(19, ' ');
string space2 = " ".PadLeft(120, ' ');

Chunk chunk1 = new Chunk(space1 + "中国XX企业对标提升数据报表\r\n\r\n", fontChinese_12); //页眉主题
Chunk chunk2 = new Chunk(space2 + "日期: " + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss") + "\r\n", fontChinese_8); //导出时间
Phrase ph = new Phrase(9)
{
chunk1,
chunk2
};
HeaderFooter header = new HeaderFooter(ph, false)
{
Border = Rectangle.NO_BORDER
};
document.Header = header;
//页码
HeaderFooter footer = new HeaderFooter(new Phrase(4, "页码: ", fontChinese_8), true)
{
Border = Rectangle.NO_BORDER,
Alignment = Element.ALIGN_CENTER,
Bottom = 20
};
document.Footer = footer;

//打开目标文档对象
document.Open();
// 创建第一页（如果只有一页的话，这一步可以省略）
document.NewPage();

PdfPTable table = new PdfPTable(1)
{
TotalWidth = 550,
LockedWidth = true
};

table.SetWidths(new int[] { 550 });
PdfPCell cell;
//自定义title
cell = new PdfPCell(new Phrase($"{model.QuotaName}({model.Stage})", fontChinese_11))
{
Colspan = 1,
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
Border = Rectangle.NO_BORDER,
FixedHeight = 50
};
table.AddCell(cell);
document.Add(table);

//自定义创建第一行表头
table = new PdfPTable(model.Attributes.Count + 2)
{
TotalWidth = 550,
LockedWidth = true
};

cell = new PdfPCell(new Phrase("单位名称", fontChinese_10))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
BackgroundColor = BaseColor.DarkGray,
FixedHeight = cellHeight
};
table.AddCell(cell);

cell = new PdfPCell(new Phrase("排名", fontChinese_10))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
BackgroundColor = BaseColor.DarkGray,
FixedHeight = cellHeight
};
table.AddCell(cell);

model.Attributes.ForEach(x =>
{
cell = new PdfPCell(new Phrase(x.AttributeName, fontChinese_10))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
BackgroundColor = BaseColor.DarkGray,
FixedHeight = cellHeight
};
table.AddCell(cell);
});

//数据渲染
model.EnterpriseComparisonQuotaValue.ForEach(x =>
{
cell = new PdfPCell(new Phrase(x.OrgName, fontChinese_8))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
FixedHeight = cellHeight
};
table.AddCell(cell);

cell = new PdfPCell(new Phrase(x.Rank, fontChinese_8))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
FixedHeight = cellHeight
};
table.AddCell(cell);
x.Values.ToList().ForEach(m =>
{
cell = new PdfPCell(new Phrase(m.Value.ToString(), fontChinese_8))
{
HorizontalAlignment = Element.ALIGN_CENTER,
VerticalAlignment = Element.ALIGN_MIDDLE,
FixedHeight = cellHeight
};
table.AddCell(cell);
});
});

document.Add(table);
//关闭目标文件
document.Close();
//关闭写入流
pdfWriter.Close();

//添加水印
AddWatermark(pdfPath, "机密文件，请勿泄露", out newFilePath);
}
catch (Exception)
{
throw;
}

return newFilePath;
}

/// <summary>
/// 添加普通偏转角度文字水印
/// </summary>
public static void AddWatermark(string inputFilePath, string text, out string outFilePath)
{
Console.WriteLine(inputFilePath);
PdfReader pdfReader = null;
PdfStamper pdfStamper = null;
string tempPath = Path.GetDirectoryName(inputFilePath) + "\\" + Path.GetFileNameWithoutExtension(inputFilePath) + "_temp.pdf";
outFilePath = Path.GetDirectoryName(inputFilePath) + "\\" + Path.GetFileNameWithoutExtension(inputFilePath) + "_watermark.pdf";
File.Copy(inputFilePath, tempPath);
try
{
pdfReader = new PdfReader(tempPath);
pdfStamper = new PdfStamper(pdfReader, new FileStream(outFilePath, FileMode.Create));
int total = pdfReader.NumberOfPages + 1;
Rectangle psize = pdfReader.GetPageSize(1);
//float width = psize.Width;
//float height = psize.Height;
PdfContentByte content;
BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
PdfGState gs = new PdfGState();
for (int i = 1; i < total; i++)
{
//content = pdfStamper.GetOverContent(i);//在内容上方加水印
content = pdfStamper.GetUnderContent(i);//在内容下方加水印
gs.FillOpacity = 0.3f; //透明度
content.SetGState(gs);
//content.SetGrayFill(0.3f);
//开始写入文本
content.BeginText();
content.SetColorFill(BaseColor.Gray);
content.SetFontAndSize(font, 30);
content.SetTextMatrix(0, 0);

//重复添加水印
for (int j = 0; j < 5; j++)
{
content.ShowTextAligned(Element.ALIGN_CENTER, text, (50.5f + i * 250), (40.0f + j * 150), (total % 2 == 1 ? -45 : 45));
}
content.EndText();
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
pdfStamper.Close();

if (pdfReader != null)
pdfReader.Close();
File.Delete(tempPath);
}
}
}
}
```

> 方法调用
```c#
var outPath = GeneratePDF.ObjectToPdf(comparisonQuotaValue, path);
```

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