pdfptable生成PDF文件有大片空白

可能是因为导出错误，把文字转成转曲线导出。

解决方法如下：

1、打开CorelDRAW，点击左侧的“文本工具”，输入要转换为曲线的文字。

2、选择文字，点击右键，选择列表中的“转换为曲线”。

3、就将原本的文字转换成了曲线。

4、点击右上角的文件跳出下拉菜单，点击发送至pdf图标。

5、左侧栏选择保存路径，直接点击即可，点击下方设置文件名称，点击下方的保存类型，选择pdf格式。

6、完成以后，在保存的路径上找到自己保存的pdf文件。打开就可以看到文件内容了。

net生成pdf表头

项目需要在线生成PDF文件，我首先考虑采用itextsharp控件来实现。具体方法参考 https://sourceforge.net/projects/itextsharp/

1.首先利用nuget 引入该控件包。

2、然后直接创建就可以了。

using iTextSharp.text

using iTextSharp.text.pdf

using System

using System.Collections.Generic

using System.Data

using System.IO

using System.Linq

using System.Text

using System.Web

public class CreatePDF

{

private static CreatePDF instance

public static CreatePDF GetInstance()

{

if (instance == null)

{

instance = new CreatePDF()

}

return instance

}

private static Document doc

//string fontdb = AppDomain.CurrentDomain.BaseDirectory + "Template\\msyh.ttc"

//private static BaseFont bf = BaseFont.CreateFont(@"C://Windows/Fonts/simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED)

static string fontdb = (AppDomain.CurrentDomain.BaseDirectory + "Template\\msyh.ttf").Replace("\\", "/")

private static BaseFont bf = BaseFont.CreateFont(fontdb + "", BaseFont.IDENTITY_H, BaseFont.EMBEDDED)

//四种字体

private static Font fontBig = new Font(bf, 14, Font.BOLD)

private static Font fontSmall = new Font(bf, (float)10.5, Font.BOLD)

private static Font fontSmallNoBold = new Font(bf, (float)10.5)

private static float IndentationLeft = 50//距左边距

//如果要传参数进来，可自定义

public string GeneratePDF(string name)

{

doc = new Document(PageSize.A4)

string filePath = string.Empty

try

{

//MemoryStream ms2 = new MemoryStream()

string fileName = string.Format("{0}.pdf", DateTime.Now.ToString("yyyyMMddHHmmss"))

filePath = AppDomain.CurrentDomain.BaseDirectory + "Template\\" + fileName

FileStream fs = new FileStream(filePath, FileMode.Create)//创建临时文件，到时生成好后删除

PdfWriter writer = PdfWriter.GetInstance(doc, fs)

writer.CloseStream = false//把doc内容写入流中

doc.Open()

//核心 *** 作

CreateLine(name)//生成一条下横线

#region 添加水印

string waterMarkName = "机密"

#endregion

doc.Close()

MemoryStream ms = new MemoryStream()

if (fs != null)

{

byte[] bytes = new byte[fs.Length]//定义一个长度为fs长度的字节数组

fs.Read(bytes, 0, (int)fs.Length)//把fs的内容读到字节数组中

ms.Write(bytes, 0, bytes.Length)//把字节内容读到流中

fs.Flush()

fs.Close()

}

MemoryStream waterMS = SetWaterMark(ms, filePath, waterMarkName)//先生成水印，再删除临时文件

//if (File.Exists(filePath))//判断临时文件是否存在，如果存在则删除

//{

//File.Delete(filePath)

//GC.Collect()//回收垃圾

//}

//SendFile(fileName, waterMS)//把PDF文件发送回浏览器

}

catch (DocumentException ex)

{

throw new Exception(ex.Message)

}

return filePath

}

#region 生成一条横线

private static void CreateLine(string name)

{

PdfPTable table = new PdfPTable(1)//一个单元格的

PdfPCell cell = new PdfPCell()

Image gif = Image.GetInstance(AppDomain.CurrentDomain.BaseDirectory + "Template\\logo.png")

gif.ScaleAbsoluteWidth(100)

cell.AddElement(gif)

cell.BorderWidth = 0f

cell.BorderWidthBottom = 0.2f

table.AddCell(cell)

doc.Add(table)

}

#endregion

#region 生成页码

private static void AddPageNumberContent()

{

var content = new Paragraph("共 页 第 页", fontSmall)

content.IndentationRight = IndentationLeft + 20

content.Alignment = 2 //居左

doc.Add(content)

}

#endregion

#region 生成单元格

private static PdfPCell GetPdfCell(string content, Font font, int horizontalAlignment)

{

Paragraph paragraph = new Paragraph(content, font)

paragraph.FirstLineIndent = 2

paragraph.SetLeading(10, 20)

paragraph.SpacingAfter = 10

PdfPCell cell = new PdfPCell(paragraph)

cell.HorizontalAlignment = horizontalAlignment//水平位置

cell.VerticalAlignment = Element.ALIGN_CENTER//垂直居中

cell.MinimumHeight = 20//单元格的最小高度

cell.Border = 0

return cell

}

#endregion

#region 生成水印

private static MemoryStream SetWaterMark(MemoryStream ms, string filePath, string waterMarkName, string waterMarkAddr = null)

{

MemoryStream msWater = new MemoryStream()

PdfReader pdfReader = null

PdfStamper pdfStamper = null

try

{

pdfReader = new PdfReader(filePath)

pdfStamper = new PdfStamper(pdfReader, msWater)

int total = pdfReader.NumberOfPages + 1//获取PDF的总页数

iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1)//获取第一页

float width = psize.Width//PDF页面的宽度，用于计算水印倾斜

float height = psize.Height

PdfContentByte waterContent

BaseFont basefont = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED)

PdfGState gs = new PdfGState()

for (int i = 1i <totali++)

{

waterContent = pdfStamper.GetOverContent(i)//在内容上方加水印

//透明度

waterContent.SetGState(gs)

//开始写入文本

waterContent.BeginText()

waterContent.SetColorFill(BaseColor.RED)

waterContent.SetFontAndSize(basefont, 18)

waterContent.SetTextMatrix(0, 0)

if (waterMarkAddr == null || waterMarkAddr == "")

{

waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2, height / 2, 55)

}

else

{

waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2, height / 2 + 100, 55)

waterContent.ShowTextAligned(Element.ALIGN_CENTER, waterMarkAddr, width / 2, height / 2 - 100, 55)

}

waterContent.EndText()

}

}

catch (Exception)

{

return ms

}

finally

{

if (pdfStamper != null)

pdfStamper.Close()

if (pdfReader != null)

pdfReader.Close()

}

return msWater

}

#endregion

//-----------------------发送PDF文件回浏览器端----------------------

public static void SendFile(string fileName, MemoryStream ms, Encoding encoding = null)

{

fileName = (fileName + "").Replace(" ", "")

encoding = encoding ?? Encoding.UTF8

if (ms != null &&!string.IsNullOrEmpty(fileName))

{

System.Web.HttpResponse response = System.Web.HttpContext.Current.Response

response.Clear()

response.Charset = encoding.BodyName// "utf-8"

if (!HttpContext.Current.Request.UserAgent.Contains("Firefox") &&!HttpContext.Current.Request.UserAgent.Contains("Chrome"))

{

fileName = HttpUtility.UrlEncode(fileName, encoding)

}

response.AddHeader("Content-Disposition", "attachmentfilename=" + fileName)

//为了解决打开，导出NPOI生成的xlsx文件时，提示发现不可读取内容。

if (!(fileName + "").ToLower().EndsWith(".xlsx"))

{

response.AddHeader("Content-Type", "application/octet-stream")

response.BinaryWrite(ms.GetBuffer())

}

else

{

response.BinaryWrite(ms.ToArray())

}

ms.Close()

ms = null

response.Flush()

response.End()

}

}

}

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特别需要注意一点的是，如果对字体有特殊要求，可以将字库文件放在项目目录下，但字库的文件类型不同，引用时略有差别。

class CustomCell implements PdfPCellEvent {

/*public void cellLayout(PdfPCell cell, Rectangle rect,

PdfContentByte[] canvas) {

PdfContentByte cb = canvas[PdfPTable.LINECANVAS]

cb.setLineDash(new float[] { 3.0f, 3.0f }, 0)

cb.stroke()

}*/

public void cellLayout(PdfPCell cell, Rectangle position,

PdfContentByte[] canvases) {

// TODO Auto-generated method stub

PdfContentByte cb = canvases[PdfPTable.LINECANVAS]

cb.saveState()

//cb.setLineCap(PdfContentByte.LINE_CAP_ROUND)

//cb.setLineDash(0, 1, 1)

cb.setLineWidth(0.5f)

cb.setLineDash(new float[] { 5.0f, 5.0f }, 0)

cb.moveTo(position.getLeft(), position.getBottom())

cb.lineTo(position.getRight(), position.getBottom())

cb.stroke()

cb.restoreState()

}

}

public class DottedLineCell2 {

public static void main(String[] args) throws IOException, DocumentException {

Document document = new Document()

PdfWriter.getInstance(document, new FileOutputStream("output.pdf"))

document.open()

CustomCell border = new CustomCell()

PdfPTable table = new PdfPTable(6)

PdfPCell cell

for (int i = 1i <= 6i++) {

cell = new PdfPCell(new Phrase("test"))

cell.setBorder(Rectangle.NO_BORDER)

cell.setCellEvent(border)

table.addCell(cell)

}

document.add(table)

document.close()

}

}

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