c # Use iTextSharp to generate pdf document
Sometimes it is necessary to generate pdf documents in the application. Add the reference of iTextSharp with nuget in vs, you can easily operate the pdf
First the code of a common operation
using iTextSharp.text.pdf;
using System.IO;
using iTextSharp.text;
namespace Net.BLL.Pdf
{
/// <summary>
/// PDF文档操作类
/// </summary>
//------------------调用--------------------------
//PDFOperation pdf = new PDFOperation();
//pdf.Open(filepath); 或 pdf.Open(new FileStream(pdfNewFile, FileMode.Create));
//pdf.SetBaseFont(@"C:\Windows\Fonts\SIMHEI.TTF");
//pdf.AddParagraph("测试文档（生成时间：" + DateTime.Now + "）", 15, 1, 20, 0, 0);
//pdf.Close();
//-------------------------------
public class PDFOperation
{
#region 构造函数
/// <summary>
/// 构造函数,默认A4大小
/// </summary>
public PDFOperation()
{
rect = PageSize.A4;
document = new Document(rect);
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="type">页面大小(如"A4")可选值A1-A10,B1,B2等 参考PageSize的值</param>
public PDFOperation(string type)
{
SetPageSize(type);
document = new Document(rect);
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="type">页面大小(如"A4") 可选值A1-A10,B1,B2等 参考PageSize的值</param>
/// <param name="marginLeft">内容距左边框距离</param>
/// <param name="marginRight">内容距右边框距离</param>
/// <param name="marginTop">内容距上边框距离</param>
/// <param name="marginBottom">内容距下边框距离</param>
public PDFOperation(string type, float marginLeft, float marginRight, float marginTop, float marginBottom)
{
SetPageSize(type);
document = new Document(rect, marginLeft, marginRight, marginTop, marginBottom);
}
#endregion
#region 私有字段
private Font font;
private Rectangle rect; //文档大小
private Document document;//文档对象
private BaseFont basefont;//字体
private PdfWriter pdfWriter;
#endregion
#region 设置字体
/// <summary>
/// 设置字体 D:\\Windows\\Fonts\\SIMSUN.TTC 如该字体，没有可以从网上下载后放在系统字体文件夹下
/// 不设置的话默认字体不支持中文
/// </summary>
public void SetBaseFont(string path)
{
basefont = BaseFont.CreateFont(path, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
}
/// <summary>
/// 设置字体
/// </summary>
/// <param name="size">字体大小</param>
public void SetFont(float size)
{
font = new Font(basefont, size);
}
#endregion
#region 设置页面大小
/// <summary>
/// 设置页面大小
/// </summary>
/// <param name="type">页面大小(如"A4") 可选值A1-A10,B1,B2等 参考PageSize的值</param>
public void SetPageSize(string type)
{
switch (type.Trim())
{
case "A4":
rect = PageSize.A4;
break;
case "A8":
rect = PageSize.A8;
break;
}
}
#endregion
#region 实例化文档
/// <summary>
/// 实例化文档
/// </summary>
/// <param name="os">文档相关信息（如路径，打开方式等）</param>
public void GetInstance(Stream os)
{
pdfWriter = PdfWriter.GetInstance(document, os);
}
#endregion
#region 打开文档对象
/// <summary>
/// 打开文档对象
/// </summary>
/// <param name="os">文档相关信息（如路径，打开方式等）</param>
public void Open(Stream os)
{
GetInstance(os);
document.Open();
}
/// <summary>
/// 打开文档对象
/// </summary>
/// <param name="pdfNewFile">文档路径</param>
public void Open(string pdfNewFile)
{
pdfWriter = PdfWriter.GetInstance(document, new FileStream(pdfNewFile, FileMode.Create));
document.Open();
}
#endregion
#region 关闭打开的文档
/// <summary>
/// 关闭打开的文档
/// </summary>
public void Close()
{
document.Close();
pdfWriter.Close();
}
#endregion
#region 添加段落
/// <summary>
/// 添加段落
/// </summary>
/// <param name="contents">内容</param>
/// <param name="fontsize">字体大小</param>
public void AddParagraph(string contents, float fontsize)
{
SetFont(fontsize);
Paragraph pra = new Paragraph(contents, font);
document.Add(pra);
}
/// <summary>
/// 添加段落,文本段
/// </summary>
/// <param name="contents">内容</param>
/// <param name="fontsize">字体大小</param>
/// <param name="Alignment">对齐方式（1为居中，0为居左，2为居右）</param>
/// <param name="SpacingAfter">段后空行数（0为默认值）</param>
/// <param name="SpacingBefore">段前空行数（0为默认值）</param>
/// <param name="MultipliedLeading">行间距（0为默认值）</param>
public void AddParagraph(string contents, float fontsize, int Alignment, float SpacingAfter, float SpacingBefore, float MultipliedLeading)
{
SetFont(fontsize);
Paragraph pra = new Paragraph(contents, font);
pra.Alignment = Alignment;
if (SpacingAfter != 0)
{
pra.SpacingAfter = SpacingAfter;
}
if (SpacingBefore != 0)
{
pra.SpacingBefore = SpacingBefore;
}
if (MultipliedLeading != 0)
{
pra.MultipliedLeading = MultipliedLeading;
}
document.Add(pra);
}
#endregion
#region 添加图片
/// <summary>
/// 添加图片
/// </summary>
/// <param name="path">图片路径</param>
/// <param name="Alignment">对齐方式（1为居中，0为居左，2为居右）</param>
/// <param name="newWidth">图片宽（0为默认值，如果宽度大于页宽将按比率缩放）</param>
/// <param name="newHeight">图片高</param>
public void AddImage(string path, int Alignment, float newWidth, float newHeight)
{
Image img = Image.GetInstance(path);
img.Alignment = Alignment;
if (newWidth != 0)
{
img.ScaleAbsolute(newWidth, newHeight);
}
else
{
if (img.Width > PageSize.A4.Width)
{
img.ScaleAbsolute(rect.Width, img.Width * img.Height / rect.Height);
}
}
document.Add(img);
}
#endregion
#region 添加链接、点
/// <summary>
/// 添加链接
/// </summary>
/// <param name="Content">链接文字</param>
/// <param name="FontSize">字体大小</param>
/// <param name="Reference">链接地址</param>
public void AddAnchorReference(string Content, float FontSize, string Reference)
{
SetFont(FontSize);
Anchor auc = new Anchor(Content, font);
auc.Reference = Reference;
document.Add(auc);
}
/// <summary>
/// 添加链接点
/// </summary>
/// <param name="Content">链接文字</param>
/// <param name="FontSize">字体大小</param>
/// <param name="Name">链接点名</param>
public void AddAnchorName(string Content, float FontSize, string Name)
{
SetFont(FontSize);
Anchor auc = new Anchor(Content, font);
auc.Name = Name;
document.Add(auc);
}
#endregion
#region === 其它属性设置 ===
/// <summary>
/// 设置title
/// </summary>
/// <param name="title"></param>
public void SetTitle(string title)
{
document.AddTitle(title);
}
/// <summary>
/// 设置subject
/// </summary>
/// <param name="subject"></param>
public void SetSubject(string subject)
{
document.AddSubject(subject);
}
/// <summary>
/// 设置keywords
/// </summary>
/// <param name="keywords"></param>
public void SetKeywords(string keywords)
{
document.AddKeywords(keywords);
}
/// <summary>
/// 设置creator
/// </summary>
/// <param name="creator"></param>
public void SetCreator(string creator)
{
document.AddCreator(creator);
}
/// <summary>
/// 设置author
/// </summary>
/// <param name="author"></param>
public void SetAuthor(string author)
{
document.AddAuthor(author);
}
#endregion
}
}
How to call the detailed instructions in the code, but you will find that the common methods of adding text and adding pictures during the operation of the pdf document are no problem, but the resulting document is not satisfactory
Where is the reason? Of course, it is a matter of typesetting. To adjust the layout of text paragraphs and pictures, the position is very troublesome. Although iTextSharp supports the setting of images and text insertion positions, it is still very laborious to set with codes.
The best way is to make a template for the pdf document first, and use the template to generate the desired pdf document, which saves time and effort, but the premise is that the template file must be prepared.
The template file can be generated using a pdf editor. You can consider using the Adobe Acrobat DC series of tools to do it. The most important thing in the process of making a document is to add the corresponding form in the document, in the corresponding form domain name Add the corresponding elements. In this case, the location and style can be set in the template document, just add the elements in the code.
The following is the code to generate a pdf document using a template
using System;
using System.Collections.Generic;
using iTextSharp.text.pdf;
using System.IO;
using iTextSharp.text;
namespace Net.BLL.Pdf
{
/// <summary>
/// 使用pdf模板方式创建pdf的帮助类
/// </summary>
//------- 调用示例 --------
// Net.BLL.Pdf.PdfWithTemplateHelper pdf = new Net.BLL.Pdf.PdfWithTemplateHelper();
// pdf.Open("E:\\PdfTest\\mytemplate.pdf", "E:\\PdfTest\\test.pdf");
// pdf.PutText("txttitle", "pdf生成测试");
// pdf.PutText("txtuser001", "Me \r\n生日：1988-8-9 \r\n爱好：运动、健身、旅游");
// pdf.PutImage(1, "img001", "e:/PdfTest/pic01.jpg");
// pdf.PutText("txtuser002", "肖鼠:鼠年出生的人的本命佛是千手观音，得千手观音庇佑。肖鼠的人财运好，在十二生肖中属于富贵型！");
// pdf.PutImage(1, "img002", "e:/PdfTest/pic02.jpg");
// pdf.PutText("txtbuddha001", "生命在于运动！人生不止，运动不息!");
// pdf.Close();
//--------- end -----------
public class PdfWithTemplateHelper
{
PdfReader pdfReader = null;
PdfStamper pdfStamper = null;
AcroFields pdfFormFields = null;
PdfWriter pdfWriter = null;
public PdfWithTemplateHelper()
{
}
/// <summary>
/// 创建文档
/// </summary>
/// <param name="pdfTemplateFile">模板文件路径</param>
/// <param name="pdfNewFile">要生成的文档路径</param>
public void Open(string pdfTemplateFile, string pdfNewFile)
{
pdfReader = new PdfReader(pdfTemplateFile);
pdfStamper = new PdfStamper(pdfReader, new FileStream(pdfNewFile, FileMode.OpenOrCreate));
pdfFormFields = pdfStamper.AcroFields;
pdfStamper.FormFlattening = true;
}
/// <summary>
/// 关闭并保存文档
/// </summary>
public void Close()
{
pdfStamper.Close();
pdfReader.Close();
pdfStamper = null;
pdfReader = null;
pdfFormFields = null;
}
/// <summary>
/// 批量添加图片
/// </summary>
/// <param name="pageIndex">页码</param>
/// <param name="fieldName">表单域名称</param>
/// <param name="imageFile">图片文件</param>
/// <param name="rowCount"></param>
/// <param name="colCount"></param>
/// <param name="space"></param>
/// <param name="isScale">是否按比例缩放</param>
/// <param name="isSquare">是否正方形</param>
/// <returns></returns>
public bool PutImageMatrix(int pageIndex, string fieldName, List<string> imageFile, int rowCount, int colCount, int space = 5, bool isScale = true, bool isSquare = false)
{
PdfContentByte pdfContentByte = pdfStamper.GetOverContent(pageIndex);
if (pdfContentByte == null)
{
return false;
}
var positions = pdfFormFields.GetFieldPositions(fieldName);
if (positions.Count == 0)
{
return false;
}
AcroFields.FieldPosition fieldPosition = positions[0];
Rectangle rect = fieldPosition.position;
float left = rect.Left;
float top = rect.Top;
float bottom = rect.Bottom;
float width = rect.Width;
float height = rect.Height;
float cellH = (height - space * (rowCount + 1)) / rowCount;
float cellW = (width - space * (colCount + 1)) / colCount;
int index = 0;
for (int row = rowCount - 1; row >= 0; row--)
{
float posBotton = bottom + (cellH + space) * row + space;
for (int col = 0; col < colCount; col++)
{
float posLeft = left + (cellW + space) * col + space;
if (index < imageFile.Count)
{
Image image = Image.GetInstance(imageFile[index]);
if (isScale)
{
image.SetAbsolutePosition(posLeft, posBotton);
image.ScaleAbsolute(cellW, cellH);
}
else
{
Single imageWidth = image.Width;
Single imageHeight = image.Height;
if (isSquare)
{
imageWidth = Math.Min(image.Width, image.Height);
imageHeight = Math.Min(image.Width, image.Height);
}
Rectangle rectDst = new Rectangle(0, 0, 0, 0);
rectDst.Left = posLeft;
rectDst.Right = posLeft + cellW;
rectDst.Bottom = posBotton;
rectDst.Top = posBotton + cellH;
Rectangle rect1 = GetValidRect(rectDst, imageWidth, imageHeight);
image.SetAbsolutePosition(rect1.Left, rect1.Bottom);
image.ScaleAbsolute(rect1);
}
pdfContentByte.AddImage(image);
}
index++;
}
}
return true;
}
/// <summary>
/// 添加图片
/// </summary>
/// <param name="pageIndex">页码</param>
/// <param name="fieldName">表单域名称</param>
/// <param name="imageFile">图片文件</param>
/// <param name="isScale">是否缩放</param>
/// <returns></returns>
public bool PutImage(int pageIndex, string fieldName, string imageFile, bool isScale = true)
{
PdfContentByte pdfContentByte = pdfStamper.GetOverContent(pageIndex);
if (pdfContentByte == null)
{
return false;
}
var positions = pdfFormFields.GetFieldPositions(fieldName);
if (positions.Count == 0)
{
return false;
}
AcroFields.FieldPosition fieldPosition = positions[0];
Rectangle rectDst = fieldPosition.position;
Image image = Image.GetInstance(imageFile);
if (isScale)
{
image.SetAbsolutePosition(rectDst.Left, rectDst.Bottom);
image.ScaleAbsolute(rectDst);
}
else
{
Single imageWidth = image.Width;
Single imageHeight = image.Height;
Rectangle rect = GetValidRect(rectDst, imageWidth, imageHeight);
image.SetAbsolutePosition(rect.Left, rect.Bottom);
image.ScaleAbsolute(rect);
}
pdfContentByte.AddImage(image);
return true;
}
/// <summary>
/// 添加文本内容
/// </summary>
/// <param name="fieldName">表单域名称</param>
/// <param name="str">文本内容</param>
/// <returns></returns>
public bool PutText(string fieldName, string str)
{
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
BaseFont simheiBase = BaseFont.CreateFont("D:\\Windows\\Fonts\\SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
pdfFormFields.AddSubstitutionFont(simheiBase);
pdfFormFields.SetField(fieldName, str);
return true;
}
Rectangle GetValidRect(Rectangle rectDst, Single imageWith, Single imageHeight)
{
Rectangle rect = new Rectangle(0, 0);
double dRatio0 = ((double)rectDst.Width) / rectDst.Height;
double dRatio1 = ((double)imageWith) / imageHeight;
double ratio = 0;
if (dRatio1 > dRatio0)
{
ratio = ((double)rectDst.Width) / imageWith;
double realHeight = imageHeight * ratio;
double diffHeight = (rectDst.Height - realHeight) / 2;
rect.Left = rectDst.Left;
rect.Top = (float)(rectDst.Top - diffHeight);
rect.Right = rectDst.Right;
rect.Bottom = (float)(rectDst.Bottom + diffHeight);
}
else
{
ratio = ((double)rectDst.Height) / imageHeight;
double realWidth = imageWith * ratio;
double diffWidth = (rectDst.Width - realWidth) / 2;
rect.Left = (float)(rectDst.Left + diffWidth);
rect.Top = rectDst.Top;
rect.Right = (float)(rectDst.Right - diffWidth);
rect.Bottom = rectDst.Bottom;
}
return rect;
}
}
}
