C#.NET iTextSharp生成PDF文件源码大全（生成表格、透明水印，页脚页眉页码等）|C/S框架网

C#.NET iTextSharp生成PDF文件源码大全（生成表格、透明水印，页脚页眉页码等）

作者:作者不详发布日期:2020/12/16 14:43:52

C#.NET iTextSharp生成PDF文件源码大全（生成表格、透明水印，页脚页眉页码等）

测试 iTextSharp 生成PDF文件：

C# Code:

string fileName = string.Format("{0}.pdf", DateTime.Now.ToString("yyyyMMddHHmmss"));
string filePath = AppDomain.CurrentDomain.BaseDirectory + "Template\\" + fileName;

string str = CSFrameworkPDF.GetInstance().GeneratePDF(filePath);

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 生成PDF文件：

C# Code:

/// <summary>
/// 生成PDF文件
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public string GeneratePDF(string filePath)
{
try
{
//A4纸尺寸：595*420，单位：磅
//doc = new Document(PageSize.A4);//默认边距，36磅
_doc = new Document(PageSize.A5, 36, 36, 36, 36);

//doc.SetMargins(0, 0, 0, 0);//移除页边距

FileStream fs = new FileStream(filePath, FileMode.Create);
PdfWriter writer = PdfWriter.GetInstance(_doc, fs);
writer.CloseStream = false;//把doc内容写入流中

_doc.Open();

//创建页眉+图片+下划线
CreatePageHeader();

_doc.AddTitle("生成PDF文件");
_doc.AddSubject("生成PDF文件");
_doc.AddKeywords("生成PDF文件");
_doc.AddCreator("www.csframework.com|C/S框架网");
_doc.AddAuthor("www.csframework.com|C/S框架网");

//中间内容
_doc.Add(new Paragraph("Hello World"));
_doc.Add(new Paragraph("标题字体：我是中国人/I'm Chinease!", fontTitle));
_doc.Add(new Paragraph("内容字体：我是中国人/I'm Chinease!", fontContent));

//Phrase类用法，同一行，短语拼接
Phrase p1 = new Phrase("/我是", fontContentUnderline);
Phrase p2 = new Phrase("/测试", fontContent);
Phrase p3 = new Phrase("/工程师www.csframework.com|C/S框架网", fontContentRed);

_doc.Add(p1);
_doc.Add(p2);
_doc.Add(p3);

//Chunk类用法，下划线中英文文本
Chunk chunk1 = new Chunk("单行下横线文本/www.csframework.com|C/S框架网", fontContentUnderline);
_doc.Add(new Paragraph(chunk1));

_doc.Add(new Paragraph(" "));//添加空行

CreateTable(CreateDemoData());

//在固定位置显示文本
CreateText(writer, "在固定位置显示文本111111111", new Rectangle(100, 0, 333, 300), fontContentRed);
CreateText(writer, "在固定位置显示文本222222222", new Rectangle(100, 0, 333, 200), fontContent);
CreateText(writer, "www.csframework.com|C/S框架网", new Rectangle(100, 0, 333, 100), fontContent);

AddPageNumberContent(writer, 1, 1); //添加页码

_doc.Close();//关闭文档

//保存PDF文件
MemoryStream ms = new MemoryStream();
if (fs != null)
{
byte[] bytes = new byte[fs.Length];//定义一个长度为fs长度的字节数组
fs.Read(bytes, 0, (int)fs.Length);//把fs的内容读到字节数组中
ms.Write(bytes, 0, bytes.Length);//把字节内容读到流中
fs.Flush();
fs.Close();
}

//设置水印
SetWaterMark(filePath);
}
catch (DocumentException ex)
{
throw new Exception(ex.Message);
}
return filePath;
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 设置自定义字体

C# Code:

//中文字体-宋体
private static string fontCHN = (AppDomain.CurrentDomain.BaseDirectory + "Template\\simsun.ttf").Replace("\\", "/");
private static BaseFont bfCHN = BaseFont.CreateFont(fontdb, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

//宋体标题-深灰色
private static Font fontTitle = new Font(bfCHN, (float)10, 1, BaseColor.DARK_GRAY);

//宋体正文内容
private static Font fontContent = new Font(BaseFont.CreateFont(fontCHN, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), (float)10, 1, BaseColor.DARK_GRAY);

//宋体正文内容-下划线字体
private static Font fontContentUnderline = new Font(BaseFont.CreateFont(fontCHN, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), (float)10, 1, BaseColor.DARK_GRAY);

//宋体正文内容-红色
private static Font fontContentRed = new Font(BaseFont.CreateFont(fontCHN, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), (float)10, 1, BaseColor.RED);

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 给PDF文件创建半透明图片水印：

C# Code:

/// <summary>
/// 设置水印
/// </summary>
/// <param name="pdfFilePath"></param>
private void SetWaterMark(string pdfFilePath)
{
PdfReader reader = null;
PdfStamper stamper = null;
string newPDFFileName = "";

try
{
reader = new PdfReader(pdfFilePath);

string waterPDF = Path.GetDirectoryName(pdfFilePath);
string fileWater = Path.GetFileName(pdfFilePath).Replace(".pdf", "") + "-Stamper.pdf";

newPDFFileName = Path.Combine(waterPDF, fileWater);

stamper = new PdfStamper(reader, new FileStream(newPDFFileName, FileMode.OpenOrCreate));

string imgPath = AppDomain.CurrentDomain.BaseDirectory + "\\Template\\logo.png";

iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(imgPath);

float width = _doc.PageSize.Width;
float height = _doc.PageSize.Height;

float waterMarkWidth = 150;

//像素
float percent = waterMarkWidth / img.Width;
img.ScaleAbsoluteWidth(waterMarkWidth);//缩放图片指定宽度
img.ScaleAbsoluteHeight(img.Height * percent);//等比例缩放高度
img.SetAbsolutePosition((width - waterMarkWidth) / 2, (height - img.Height * percent) / 2);//设置水印位置
img.Rotation = 95;//旋转角度

//指定颜色透明,如：白色
img.Transparency = new int[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

//设置透明度
//create new graphics state and assign opacity
PdfGState graphicsState = new PdfGState();
graphicsState.FillOpacity = 0.2F; // (or whatever)
//set graphics state to pdfcontentbyte
PdfContentByte contentByte;
int j = 0;
int n = reader.NumberOfPages;
while (j < n)
{
j++;
contentByte = stamper.GetOverContent(j);
contentByte.SetGState(graphicsState);//设置透明度
contentByte.AddImage(img);
}
}
finally
{
if (stamper != null) stamper.Close();
if (stamper != null) reader.Close();

//改名
if (File.Exists(newPDFFileName))
{
File.Delete(pdfFilePath);
FileInfo fi = new FileInfo(newPDFFileName);
fi.MoveTo(pdfFilePath);
}
}
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 创建带图片LOGO的页眉：

C# Code:

private static void CreatePageHeader()
{
PdfPTable table = new PdfPTable(1);//一个单元格的
table.TotalWidth = 350;//设置绝对宽度
table.LockedWidth = true;//使绝对宽度模式生效
table.PaddingTop = 0;

PdfPCell cell = new PdfPCell();
Image gif = Image.GetInstance(AppDomain.CurrentDomain.BaseDirectory + "Template\\logo.png");
gif.ScaleAbsoluteWidth(100);//缩放图片
cell.AddElement(gif);
cell.BorderWidth = 0f;
cell.BorderWidthBottom = 0.1f;//底部画线
cell.BorderColorBottom = BaseColor.DARK_GRAY;

table.AddCell(cell);
_doc.Add(table);
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 在固定位置输出页码：

C# Code:

/// <summary>
/// 在固定位置生成页码
/// </summary>
/// <param name="writer"></param>
/// <param name="totalPage"></param>
/// <param name="currentPage"></param>
private static void AddPageNumberContent(PdfWriter writer, int totalPage, int currentPage)
{
//string text = String.Format("共 {0} 页第 {1} 页", totalPage, currentPage);
string text = String.Format("第 {0} 页", currentPage);
ColumnText ct = new ColumnText(writer.DirectContent);
ct.SetSimpleColumn(new Rectangle(200, 0, 533, 50));
ct.AddElement(new Paragraph(text, fontPageNo));
ct.Go();
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 在PDF页面固定位置输出文本

C# Code:

/// <summary>
/// 在PDF页面固定位置输出文本
/// </summary>
/// <param name="writer"></param>
/// <param name="text"></param>
/// <param name="rect"></param>
/// <param name="font"></param>
private void CreateText(PdfWriter writer, string text, Rectangle rect, Font font)
{
//在固定位置显示文本
ColumnText ct = new ColumnText(writer.DirectContent);
ct.SetSimpleColumn(rect);
ct.AddElement(new Paragraph(text, font));
ct.Go();
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp 在PDF生成表格

C# Code:

/// <summary>
/// 在PDF生成表格
/// </summary>
private void CreateTable(DataTable dt)
{
iTextSharp.text.pdf.PdfPTable datatable = new PdfPTable(6);
float[] headerwidths = { 50, 100, 40, 40, 100, 80 };
datatable.SetWidths(headerwidths);
datatable.WidthPercentage = 100;
datatable.HeaderRows = 1;
datatable.PaddingTop = 5;

for (int i = 0; i <= dt.Columns.Count - 1; i++)
{
Phrase ph = new Phrase(dt.Columns[i].ColumnName, fontContent);
iTextSharp.text.pdf.PdfPCell cell1 = new PdfPCell(ph);
cell1.HorizontalAlignment = Element.ALIGN_CENTER;
cell1.BackgroundColor = new iTextSharp.text.BaseColor(0xC0, 0xC0, 0xC0);
datatable.AddCell(cell1);
}

foreach (DataRow R in dt.Rows)
{
datatable.AddCell(new Phrase(R["ID"].ToString(), fontContent));
datatable.AddCell(new Phrase(R["Name"].ToString(), fontContent));
datatable.AddCell(new Phrase(R["Sex"].ToString(), fontContent));
datatable.AddCell(new Phrase(R["Age"].ToString(), fontContent));
datatable.AddCell(new Phrase(R["Phone"].ToString(), fontContent));
datatable.AddCell(new Phrase(R["Address"].ToString(), fontContent));
}

_doc.Add(datatable);
}

//来源:C/S框架网 | www.csframework.com | QQ:23404761

iTextSharp Demo总结：

从代码上不难看出，普遍用到的标签大多为Document、Paragraph、Table、Cell、Chunck、Font、Element，通过这些标签大概能组合出自己想要的效果。

iTextSharp 页面尺寸度量单位：

度量单位：厘米、英寸或象素，事实上，默认的度量系统以排版单位磅为基础得出其他单位的近似值，

如1英寸=72磅，如果你想在A4页面的PDF中创建一个矩形，你需要计算以下数据：

21 厘米 / 2.54 = 8.2677 英寸

8.2677英寸* 72 = 595 磅

29.7 厘米 / 2.54 = 11.6929 英寸

11.6929英寸* 72 = 842 磅

默认边距为36磅即半英寸。