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C#使用itextsharp生成PDF文件的实现代码

  • 时间:2021-07-06 19:42 编辑: 来源: 阅读:
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摘要:C#使用itextsharp生成PDF文件的实现代码
项目需求需要生成一个PDF文档,使用的是VS2010,ASP.NET。 网络上多次搜索没有自己想要的,于是硬着头皮到itextpdf官网看英文文档,按时完成任务,以实用为主,共享一下: [b]使用HTML文件创建PDF模板: [/b][b]使用自定义字体的一种方法: [/b]
[u]复制代码[/u] 代码如下:
                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是微软操作系统自带的字体,目录在C:\Windows\Fonts,建议将需要的字体拷贝到项目中使用,否则会出现引用不到的情况。 使用自定义样式:
[u]复制代码[/u] 代码如下:
                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);
这里既可以使用了StyleSheet的LoadStyle方法。 注意itextsharp对HTML元素的支持很弱,像label、div等元素的对齐、背景颜色等属性支持不好,建议使用table标签。 [b]重写Font的GetFont方法: [/b]
[u]复制代码[/u] 代码如下:
public  class MyFontFactory : IFontProvider         {             public  Font GetFont(String fontname,String encoding, Boolean embedded, float size,int style, BaseColor color)             {                 if (fontname == "微软雅黑")                 {                     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;             }         }
这里要想使用自定义字体需要继承IFontProvider接口,并重写Font的GetFont方法。 [b]将自定义字体和样式表加入到文档: [/b]
[u]复制代码[/u] 代码如下:
                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);
[b]使用PdfContentByte为元素加背景颜色: [/b]
[u]复制代码[/u] 代码如下:
                PdfContentByte pcb = writer.DirectContentUnder;                 pcb.SetRGBColorFill(0, 255, 0);                 pcb.SetRGBColorFill(1, 54, 108);                 pcb.Rectangle(20, 413, 800, 42);                 pcb.Fill();
缺点显而易见,就是需要绝对坐标,小弟学疏才浅,再加时间紧迫,只能如此。如果大牛知道更好的方法,还望不吝赐教。 完整代码:
[u]复制代码[/u] 代码如下:
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 的摘要说明 /// </summary> namespace WSE.LCPI {     public class CreatePDF     {         public CreatePDF()         {             //             //TODO: 在此处添加构造函数逻辑             //         }        public  class MyFontFactory : IFontProvider         {             public  Font GetFont(String fontname,String encoding, Boolean embedded, float size,int style, BaseColor color)             {                 if (fontname == "微软雅黑")                 {                     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;         }     } }
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