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C#使用itextsharp生成PDF文件的實(shí)現(xiàn)代碼

更新時(shí)間：2013年07月31日 09:27:30 作者：

以下是對在C#中使用itextsharp生成PDF文件的實(shí)現(xiàn)代碼進(jìn)行了詳細(xì)分析介紹，需要的朋友可以過來參考下

項(xiàng)目需求需要生成一個(gè)PDF文檔，使用的是VS2010，ASP.NET。
網(wǎng)絡(luò)上多次搜索沒有自己想要的，于是硬著頭皮到itextpdf官網(wǎng)看英文文檔，按時(shí)完成任務(wù)，以實(shí)用為主，共享一下：
使用HTML文件創(chuàng)建PDF模板：
使用自定義字體的一種方法：

復(fù)制代碼代碼如下:

                FontFactory.Register(System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "\\Fonts\\RAGE.TTF", "myFont");
                Font myFont = FontFactory.GetFont("myFont");
                BaseFont bf = myFont.BaseFont;

其中RAGE.TTF是微軟操作系統(tǒng)自帶的字體，目錄在C:\Windows\Fonts，建議將需要的字體拷貝到項(xiàng)目中使用，否則會(huì)出現(xiàn)引用不到的情況。
使用自定義樣式：

復(fù)制代碼代碼如下:

                StyleSheet css = new StyleSheet();
                Dictionary<String, String> dict= new Dictionary<string, string>();
                dict.Add(HtmlTags.BGCOLOR, "#01366C");
                dict.Add(HtmlTags.COLOR, "#000000");
                dict.Add(HtmlTags.SIZE,"25");
                css.LoadStyle("css1", dict);

這里既可以使用了StyleSheet的LoadStyle方法。
注意itextsharp對HTML元素的支持很弱，像label、div等元素的對齊、背景顏色等屬性支持不好，建議使用table標(biāo)簽。
重寫Font的GetFont方法：

復(fù)制代碼代碼如下:

public  class MyFontFactory : IFontProvider
        {
            public  Font GetFont(String fontname,String encoding, Boolean embedded, float size,int style, BaseColor color)
            {
                if (fontname == "微軟雅黑")
                {
                    string fontpath = System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "\\Fonts\\MSYH.ttf";
                    BaseFont bf3 = BaseFont.CreateFont(fontpath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                    Font fontContent = new Font(bf3,size,style,color);
                    return fontContent;
                }
                else {
                    Font fontContent = FontFactory.GetFont(fontname, size, style, color);
                    return fontContent;
                }
            }
            public  Boolean IsRegistered(String fontname)
            {
                return false;
            }
        }

這里要想使用自定義字體需要繼承IFontProvider接口，并重寫Font的GetFont方法。
將自定義字體和樣式表加入到文檔：

復(fù)制代碼代碼如下:

                Dictionary<String, Object> font = new Dictionary<string, object>();
                font.Add(HTMLWorker.FONT_PROVIDER,new MyFontFactory());

                List<IElement> p = HTMLWorker.ParseToList(new StreamReader(html), css,font);

使用PdfContentByte為元素加背景顏色：

復(fù)制代碼代碼如下:

                PdfContentByte pcb = writer.DirectContentUnder;
                pcb.SetRGBColorFill(0, 255, 0);
                pcb.SetRGBColorFill(1, 54, 108);
                pcb.Rectangle(20, 413, 800, 42);
                pcb.Fill();

缺點(diǎn)顯而易見，就是需要絕對坐標(biāo)，小弟學(xué)疏才淺，再加時(shí)間緊迫，只能如此。如果大牛知道更好的方法，還望不吝賜教。
完整代碼：

復(fù)制代碼代碼如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using iTextSharp.text.pdf;
using iTextSharp.text;
using System.IO;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.html;
/// <summary>
///CreatePDF 的摘要說明
/// </summary>
namespace WSE.LCPI
{
    public class CreatePDF
    {
        public CreatePDF()
        {
            //
            //TODO: 在此處添加構(gòu)造函數(shù)邏輯
            //
        }
       public  class MyFontFactory : IFontProvider
        {
            public  Font GetFont(String fontname,String encoding, Boolean embedded, float size,int style, BaseColor color)
            {
                if (fontname == "微軟雅黑")
                {
                    string fontpath = System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "\\LCPI\\Fonts\\MSYH.ttf";
                    BaseFont bf3 = BaseFont.CreateFont(fontpath, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                    Font fontContent = new Font(bf3,size,style,color);
                    return fontContent;
                }
                else {
                    Font fontContent = FontFactory.GetFont(fontname, size, style, color);
                    return fontContent;
                }
            }
            public  Boolean IsRegistered(String fontname)
            {
                return false;
            }
        }
        /// <summary>
        /// 生成PDF
        /// </summary>
        /// <param name="html"></param>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static Boolean HTMLToPDF(string html, String fileName)
        {
            Boolean isOK = false;
            try
            {
                TextReader reader = new StringReader(html);
                // step 1: creation of a document-object
                Document document = new Document(PageSize.A4.Rotate(), 30, 30, 30, 30);
                // step 2:
                // we create a writer that listens to the document
                // and directs a XML-stream to a file
                fileName = System.Web.HttpContext.Current.Request.PhysicalApplicationPath + "\\PDF\\" + fileName+".pdf";
              FileStream fs=new FileStream(fileName, FileMode.Create,FileAccess.Write,FileShare.ReadWrite);
                PdfWriter writer = PdfWriter.GetInstance(document,fs );
                HTMLWorker worker = new HTMLWorker(document);
                document.Open();
                worker.StartDocument();
                StyleSheet css = new StyleSheet();
                Dictionary<String, Object> font = new Dictionary<string, object>();
                font.Add(HTMLWorker.FONT_PROVIDER,new MyFontFactory());
                Dictionary<String, String> dict= new Dictionary<string, string>();
                dict.Add(HtmlTags.BGCOLOR, "#01366C");
                dict.Add(HtmlTags.COLOR, "#000000");
                dict.Add(HtmlTags.SIZE,"25");
                css.LoadStyle("css", dict);

                List<IElement> p = HTMLWorker.ParseToList(new StreamReader(html), css,font);
                for (int k = 0; k < p.Count; k++)
                {
                    document.Add((IElement)p[k]);
                }
                PdfContentByte pcb = writer.DirectContentUnder;
                pcb.SetRGBColorFill(0, 255, 0);
                pcb.SetRGBColorFill(1, 54, 108);
                pcb.Rectangle(20, 413, 800, 42);
                pcb.Fill();
                worker.EndDocument();
                worker.Close();               
                document.Close();
                reader.Close();
                isOK = true;
            }
            catch (Exception ex)
            {
                isOK = false;
            }
            finally {

            }
            return isOK;
        }
    }
}