iTextSharp学习
简介和参考文章:
iTextSharp是一款开源的PDF操作类库，使用它可以快速的创建PDF文件。
中文参考网站：http://hardrock.cnblogs.com/
英文参考网站：http://itext.ugent.be/library/
· 技术文章（http://itext.ugent.be/articles/）
· 在线示例 （http://itextdocs.lowagie.com/tutorial/）
· 英文API（http://itext.ugent.be/library/api/）
iTextSharp常用对象:
Document:（文档）生成pdf必备的一个对象。
生成一个Document示例。
Document document = new Document(PageSize.A4, 30, 30, 5, 5);
定义了一个A4纸张的pdf.页面显示距左30，距右30，距上5，距下5。
打开当前Document
document.Open();
为当前Document添加内容：
document.Add(new Paragraph("Hello World"));
关闭Document
document.Close();
Chunk：(块)是能被添加到（Document）文档的文本的最小单位，块可以用于构建其他基础元素如(Paragraph)段落。
创建了一个内容为“hello World”、红色、斜体、COURIER字体、尺寸20的一个块：
Chunk chunk = new Chunk("Hello world", FontFactory.GetFont(FontFactory.COURIER, 20, Font.ITALIC, new Color(255, 0, 0)));document.Add(new Paragraph(chunk));Paragraph:（段落）段落是一系列块构成，段落有确定的间距。段落可以左对齐、右对齐和居中对齐。添加到文档中的每一个段落将自动另起一行。
//构建一个段落实例 Paragraph ph1 = new Paragraph(); //构建块"chunk1" Chunk chunk1 = new Chunk("Hello world", FontFactory.GetFont(FontFactory.COURIER, 20, Font.ITALIC, new Color(255, 0, 0))); //向块中追加内容 chunk1.Append(" Hello Mi"); //构建块"chunk2" Chunk chunk2 = new Chunk(" Word hello", FontFactory.GetFont(FontFactory.COURIER, 20, Font.ITALIC, new Color(255, 255, 0))); //向块中追加内容 chunk2.Append(" Hello Mi"); //将块加入到段落中 ph1.Add(chunk1); ph1.Add(chunk2); //构建一个图片对像实例 Image jpg1 = Image.GetInstance("myKids.jpg"); jpg1.Alignment = Element.ALIGN_CENTER; ph1.Add(jpg1); //设定段落的间距 ph1.Leading = 14; //段落左对其 ph1.Alignment = Element.ALIGN_CENTER; //将段落添加到pdf文档中显示出来 document.Add(ph1); 显示效果：
Image:图片对象
根据媒体文件地址获取Image对象。
Image gif = Image.getInstance("vonnegut.gif"); Image jpeg = Image.getInstance("myKids.jpg"); Image png = Image.getInstance("hitchcock.png"); jpeg.ScalePercent(10);//将图片按%大小显示。 jpeg.SetAbsolutePosition(0, 0);// 图片放要页面上一个绝对位置(0,0) jpeg.Alignment = Image.ALIGN_TOP;//设置图片的对其方式。Table：（表格）Pdf里面重要的布局对象。
<!---下面演示如何根据htm的<table></table>生成对应的pdf。-->
<table width="595" border="0" cellpadding="3" cellspacing="2">
<tr>
<td colspan="3" ><img src="surfing.gif" /></td>
</tr>
<tr>
<td width="60%" rowspan="2" bgcolor="#00CC99">aaaaaa</td>
<td width="20%" height="48">bbbbb</td>
<td width="20%">cccccc</td>
</tr>
<tr>
<td >dddd</td>
<td>eeeeee</td>
</tr>
</table>
<table width="595" border="0" cellpadding="3" cellspacing="2">
<tr>
<td colspan="3" ><img src="surfing.gif" /></td>
</tr>
<tr>
<td width="60%" rowspan="2" bgcolor="#00CC99">aaaaaa</td>
<td width="20%" height="48">bbbbb</td>
<td width="20%">cccccc</td>
</tr>
<tr>
<td >dddd</td>
<td>eeeeee</td>
</tr>
</table>
//定一个3行，列的表格 //创建一个表格最通用的办法是预先知道有几行几列： //public Table(int columns, int rows); Table tb1 = new Table(3, 3); //设定表格的总体宽度 tb1.AbsWidth = "595"; tb1.Cellpadding = 2; tb1.Cellspacing = 3; //定义表格各个列的宽度
tb1.Widths=new float[]{60,20,20}; //定义表格的bord的宽度为 //定义表格的bord的宽度为tb1.BorderWidth =1; tb1.Border = Rectangle.NO_BORDER; tb1.DefaultCellBorder = Rectangle.NO_BORDER; Image top1 = Image.GetInstance("surfing.gif"); Cell cell = new Cell(top1); cell.Colspan = 3; tb1.AddCell(cell); cell = new Cell(new Paragraph("aaaaaa")); cell.Rowspan = 2; System.Drawing.ColorConverter htmColor = new System.Drawing.ColorConverter(); Color pdfColor=new Color((System.Drawing.Color)htmColor.ConvertFromString("#00CC99")); cell.BackgroundColor = pdfColor; cell.HorizontalAlignment = Element.ALIGN_RIGHT; tb1.AddCell(cell); cell = new Cell(new Paragraph("bbbbb")); cell.Leading = 48; tb1.AddCell(cell); cell = new Cell(new Paragraph("cccccc")); tb1.AddCell(cell); cell = new Cell(new Paragraph("dddd")); tb1.AddCell(cell); cell = new Cell(new Paragraph("eeeeee")); tb1.AddCell(cell); document.Add(tb1);pdf:
PdfPTable:Table对象可以转化成PdfPTable,因为现在的类库的PdfPTable不支持rowspan大于1，所以转化的table的rowspan不能大于1，PdfPTable可以浮动在pdf页的任意位置。
PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("Chap0103.pdf", FileMode.Create)); document.Open(); //定义一个1列2行的table Table tb1 = new Table(1, 2); //设定表格的总体宽度 tb1.AbsWidth = "595"; tb1.Cellpadding = 2; tb1.Cellspacing = 3; //定义表格各个列的宽度 tb1.Border = Rectangle.NO_BORDER; tb1.DefaultCellBorder = Rectangle.NO_BORDER; Cell cell = new Cell(new Paragraph("kkkkkkkkk")); System.Drawing.ColorConverter htmColor = new System.Drawing.ColorConverter(); Color pdfColor = new Color((System.Drawing.Color)htmColor.ConvertFromString("#00CC99")); cell.BackgroundColor = pdfColor; cell.Leading = 14; tb1.AddCell(cell); cell = new Cell(new Paragraph("bbbbb")); cell.Leading = 14; tb1.AddCell(cell); //允许转换PdfPTable tb1.Convert2pdfptable = true; //转换为PdfPTable PdfPTable ptbm = tb1.CreatePdfPTable(); ptbm.SetTotalWidth(new float[] {595}); ptbm.WriteSelectedRows(0, -1, document.LeftMargin + 100, document.BottomMargin + 400, writer.DirectContent);IPdfPageEvent:这是一个重要的接口，它定义了的方法有
IPdfPageEvent Members IPdfPageEvent Members
public void OnOpenDocument(PdfWriter writer, Document document)
{
} public void OnCloseDocument(PdfWriter writer, Document document) { } public void OnParagraph(PdfWriter writer, Document document, float paragraphPosition) { // TODO: Add PageNumbersWatermark.OnParagraph implementation } public void OnEndPage(PdfWriter writer, Document document) { } public void OnSection(PdfWriter writer, Document document, float paragraphPosition, int depth, Paragraph title) { // TODO: Add PageNumbersWatermark.OnSection implementation } public void OnSectionEnd(PdfWriter writer, Document document, float paragraphPosition) { // TODO: Add PageNumbersWatermark.OnSectionEnd implementation } public void OnParagraphEnd(PdfWriter writer, Document document, float paragraphPosition) { // TODO: Add PageNumbersWatermark.OnParagraphEnd implementation } public void OnGenericTag(PdfWriter writer, Document document, Rectangle rect, string text) { // TODO: Add PageNumbersWatermark.OnGenericTag implementation } public void OnChapterEnd(PdfWriter writer, Document document, float paragraphPosition) { // TODO: Add PageNumbersWatermark.OnChapterEnd implementation } public void OnChapter(PdfWriter writer, Document document, float paragraphPosition, Paragraph title) { // TODO: Add PageNumbersWatermark.OnChapter implementation } public void OnStartPage(PdfWriter writer, Document document) { }
#endregion设定生成pageEvent
PdfWriter writer=PdfWriter.GetInstance(document, new FileStream(FileUrl, FileMode.Create));
//页面事件指向IPdfPageEvent接口
writer.PageEvent = this;
//页面事件指向IPdfPageEvent接口
writer.PageEvent = this;
