概述：
使用Html为模板，采用iTextSharp将一个Html模板生成Pdf文件
代码:(这个代码来源于网络,仅做使用)
原代码如下:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.tool.xml;
using iTextSharp.tool.xml.html;
namespace Eqiupment.Service
{
/// <summary>
/// HTML转PDF帮助类
/// </summary>
public class HtmlToPdfHelper
{
/// <summary>
/// 准备好的html字符串
/// </summary>
private string m_HtmlString;
/// <summary>
/// PDF保存目录（绝对路径）
/// </summary>
private string m_PDFSaveFloder;
/// <summary>
/// 图片XY字典，例如 [{img1, 100,200},{img2,20,30}}
/// </summary>
private Dictionary<string, Tuple<float, float>> m_ImageXYDic = null;
/// <summary>
/// PDF保存目录（绝对路径）
/// </summary>
private string FileName;
public HtmlToPdfHelper(string htmlString, string pdfSaveFloder, Dictionary<string, Tuple<float, float>> imageXYDic, string fileName)
{
m_HtmlString = htmlString;
m_PDFSaveFloder = pdfSaveFloder;
m_ImageXYDic = imageXYDic;
FileName = fileName;
}
//生成PDF
public bool BuilderPDF()
{
try
{
string pdfSavePath = Path.Combine(m_PDFSaveFloder, FileName + ".pdf");
if (!Directory.Exists(m_PDFSaveFloder))
{
Directory.CreateDirectory(m_PDFSaveFloder);
}
using (FileStream fs = new FileStream(pdfSavePath, FileMode.OpenOrCreate))
{
byte[] htmlByte = ConvertHtmlTextToPDF(m_HtmlString);
string HTML = Encoding.UTF8.GetString(htmlByte);
fs.Write(htmlByte, 0, htmlByte.Length);
return true;
}
}
catch (Exception ex)
{
throw new ApplicationException("保存PDF到磁盘时异常", ex);
}
}
//将html字符串转为字节数组（代码来自百度）
private byte[] ConvertHtmlTextToPDF(string htmlText)
{
if (string.IsNullOrEmpty(htmlText))
{
return null;
}
//避免當htmlText無任何html tag標籤的純文字時，轉PDF時會掛掉，所以一律加上<p>標籤
htmlText = "<p>" + htmlText + "</p>";
try
{
MemoryStream outputStream = new MemoryStream();//要把PDF寫到哪個串流
byte[] data = Encoding.UTF8.GetBytes(htmlText);//字串轉成byte[]
MemoryStream msInput = new MemoryStream(data);
Document doc = new Document();//要寫PDF的文件，建構子沒填的話預設直式A4
PdfWriter writer = PdfWriter.GetInstance(doc, outputStream);
//指定文件預設開檔時的縮放為100%
PdfDestination pdfDest = new PdfDestination(PdfDestination.XYZ, 0, doc.PageSize.Height, 1f);
//開啟Document文件
doc.Open();
//使用XMLWorkerHelper把Html parse到PDF檔裡
XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msInput, null, Encoding.UTF8, new UnicodeFontFactory());
//將pdfDest設定的資料寫到PDF檔
PdfAction action = PdfAction.GotoLocalPage(1, pdfDest, writer);
writer.SetOpenAction(action);
doc.Close();
msInput.Close();
outputStream.Close();
//回傳PDF檔案
return outputStream.ToArray();
}
catch (Exception ex)
{
throw new ApplicationException("转PDF时异常", ex);
}
}
//字体工厂（代码来自百度）
public class UnicodeFontFactory : FontFactoryImp
{
private static readonly string arialFontPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory
, "fonts/arialuni.ttf");//arial unicode MS是完整的unicode字型。
private static readonly string 标楷体Path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
"fonts/kaiu.ttf");//标楷体
public override Font GetFont(string fontname, string encoding, bool embedded, float size, int style, BaseColor color,
bool cached)
{
BaseFont baseFont = BaseFont.CreateFont(arialFontPath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
return new Font(baseFont, size, style, color);
}
}
//自定义的图片处理类（代码来自百度）
public class CustomImageTagProcessor : iTextSharp.tool.xml.html.Image
{
//个人加入的图片位置处理代码
private float _offsetX = 0;
private float _offsetY = 0;
private Dictionary<string, Tuple<float, float>> _imageXYDict;//个人加入的图片位置处理代码
public CustomImageTagProcessor(Dictionary<string, Tuple<float, float>> imageXYDict)//个人加入的图片位置处理代码
{
_imageXYDict = imageXYDict;
}
protected void SetImageXY(string imageId)//个人加入的图片位置处理代码
{
if (_imageXYDict == null)
{
return;
}
Tuple<float, float> xyTuple = null;
_imageXYDict.TryGetValue(imageId, out xyTuple);
if (xyTuple != null)
{
_offsetX = xyTuple.Item1;
_offsetY = xyTuple.Item2;
}
}
public override IList<IElement> End(IWorkerContext ctx, Tag tag, IList<IElement> currentContent)
{
IDictionary<string, string> attributes = tag.Attributes;
string src;
if (!attributes.TryGetValue(HTML.Attribute.SRC, out src))
return new List<IElement>(1);
if (string.IsNullOrEmpty(src))
return new List<IElement>(1);
string imageId;//个人加入的图片位置处理代码
if (!attributes.TryGetValue(HTML.Attribute.ID, out imageId))//个人加入的图片位置处理代码
return new List<IElement>(1);
if (string.IsNullOrEmpty(imageId))
return new List<IElement>(1);
SetImageXY(imageId);//个人加入的图片位置处理代码
if (src.StartsWith("data:image/", StringComparison.InvariantCultureIgnoreCase))
{
// data:[][;charset=][;base64],
var base64Data = src.Substring(src.IndexOf(",") + 1);
var imagedata = Convert.FromBase64String(base64Data);
iTextSharp.text.Image.GetInstance(imagedata);
var image = iTextSharp.text.Image.GetInstance(imagedata);
var list = new List<IElement>();
var htmlPipelineContext = GetHtmlPipelineContext(ctx);
list.Add(GetCssAppliers().Apply(new Chunk((iTextSharp.text.Image)GetCssAppliers().Apply(image, tag, htmlPipelineContext), _offsetX, _offsetY, true), tag, htmlPipelineContext));
return list;
}
else
{
return base.End(ctx, tag, currentContent);
}
}
}
}
}根据Html生成Pdf,此例中，Html使用视图来产生
StringBuilder sbInfo = new StringBuilder();
string htmlInfo = HttpHelper.GetHtml("http://localhost:13028/devtest/tplhtml", "utf-8");
HtmlToPdfHelper htmlToPdfHelper = new HtmlToPdfHelper(htmlInfo, "d:\\tmp", null, "11.pdf");
htmlToPdfHelper.BuilderPDF();结果
