我已经测试了iTextsharp和iText7,用于HTML到PDF的转换。基于性能iTextsharp为创建10000 PDF需要3分钟的时间。但iText7需要17分钟才能创建10000个PDF。由于iText7是与iTextsharp相比的新版本,因此我决定将iText7用于商业目的。但性能明智的iText7是低。所以请告诉我如何提高iText7中HTML到PDF转换的性能?iText7与iTextSharp相比的性能问题
测试中iText7
For i As Integer = 0 To 10000
HTML = ReadFile '=> Read HTML file from particular location
'HTML = Replace(HTML) => To Replace the content dynamically
Dim writer As PdfWriter
Dim array() As Byte = System.Text.Encoding.ASCII.GetBytes("a")
writer = New PdfWriter(FileName, New WriterProperties().SetStandardEncryption(array, array, EncryptionConstants.ALLOW_PRINTING,
EncryptionConstants.ENCRYPTION_AES_256))
HtmlConverter.ConvertToPdf(HTML, writer)
Next
测试在iTextSharp的
Imports iTextSharp.text
Imports iTextSharp.text.pdf
Imports iTextSharp.pdfa
Imports System.IO
Imports iTextSharp.text.html.simpleparser
Imports System.Text
Imports iTextSharp.tool.xml.html
Imports iTextSharp.tool.xml
Imports iTextSharp.tool.xml.pipeline.html
For i As Integer = 0 To 10000
HTML = ReadFile '=> Read HTML file from particular location
'HTML = Replace(HTML) => To Replace the content dynamically
Dim bPDF As Byte()
Dim ms As New MemoryStream
Dim doc As Document
doc = New Document(PageSize.A4, 25, 25, 25, 25)
Dim txtReader As New StringReader(Html)
Dim oPdfWriter As PdfWriter
oPdfWriter = PdfWriter.GetInstance(doc, ms)
oPdfWriter.SetEncryption(iTextSharp.text.pdf.PdfWriter.ENCRYPTION_AES_128, "q", "a", 2)
Dim htmlWorker As New HTMLWorker(doc)
doc.Open()
htmlWorker.StartDocument()
htmlWorker.Parse(txtReader)
htmlWorker.EndDocument()
htmlWorker.Close()
doc.Close()
bPDF = ms.ToArray()
Dim FIleName As String = "D:\ItextSharp_" & Now.ToString("ddMMyyyyHHMMssffffff") & ".pdf"
File.WriteAllBytes(FIleName, bPDF)
Next
Function ReadFile()
Dim stringReader As String = ""
Dim objReader As New System.IO.StreamReader("D:\AS1-Revamp\TestHTML\test.html")
Do While objReader.Peek() <> -1
stringReader = stringReader & objReader.ReadLine() & vbNewLine
Loop
ReadFile = stringReader
End Function
我用上面的代码来测试性能... iText7搭接更多时间放置相比iTextSharp的中提到的路径PDF文件。
编辑:复制/在其他问题的HTML贴:基于我在我发出HTML文件MR.Amedee范Gasse路径iText7 Performance Issue Compared With iTextSharp问题
。所以,请告诉我如何提高iText7的性能..
<div id = "headerdiv" style="width:540px; float:left; background:#ededed; padding:30px; overflow:hidden;">
<br>
<br>
<br>
<div>
<img border='0' src='D:\AS1-Revamp\TestHTML\newlog.bmp' width='100' height='40'>
</div>
<p style="color:Red;align=center;" > Details</p>
<br>
<br>
<table >
<tr border='0'>
<td bgcolor='Green'>
<font size="3" color="white">
SDetails
</font>
</td>
</td>
</tr>
<tr border='0'>
<td>
<div id="dvKYC">
<table border='1'>
<tr>
<td><#lsName#></td>
<td>No:<#lsno#></td>
</tr>
<tr border='1'>
<td width=500><#lsAddess#></td>
<td></td>
</tr>
<tr>
<td><#lsContacts#></td>
<td> </td>
</tr>
</table>
</div>
</td>
</tr>
</table>
<br>
<div >
<table >
<tr border='0'>
<td bgcolor='Green'>
<font size="3" color="white">
Status
</font>
</td>
</td>
</tr>
</table>
<table style="width:100%;">
<tr bgcolor=gray >
<td style="width:30%;text-align: left; font-weight: bold;">UUH </td>
<td style="width:20%;text-align: left; font-weight: bold;">PN</td>
<td style="width:20%;text-align: left; font-weight: bold;">KC </td>
<td style="width:20%;text-align: left; font-weight: bold;">CC</td>
</tr>
<tr>
<td style"width:200px;"><#lsHs#></td>
<td ><#lsPN#></td>
<td><#lsKC#></td>
<td><#lsCC#></td>
</tr>
</table>
</div>
<div >
<table >
<tr border='0'>
<td bgcolor='Green'>
<font size="3" color="white">
STD
</font>
</td>
</td>
</tr>
</table>
<##TT##>
</div>
我已经申请以下两个代码错误ConverterProperties来了之后
1.setCreateAcroForm不是iText.Html2pdf.ConverterProperties成员
2.setOutlineHandler不是iText.Html2pdf.ConverterProperties
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim converterProperties As ConverterProperties = New ConverterProperties
With converterProperties
.SetBaseUri(".")
.setCreateAcroForm(False)
.SetCssApplierFactory(New DefaultCssApplierFactory())
.SetFontProvider(New DefaultFontProvider())
.SetMediaDeviceDescription(MediaDeviceDescription.CreateDefault())
.setOutlineHandler(New OutlineHandler())
.SetTagWorkerFactory(New DefaultTagWorkerFactory())
End With
Dim HTML = ReadFile("Input_Template")
For i = 0 To 10000
LicenseKey.LoadLicenseFile("C:\iText7\itextkey-0.xml")
Dim PDF = "E:\iText\testpdf " & i & ".pdf"
Dim m As New MemoryStream
Dim writer As PdfWriter
Dim array() As Byte = System.Text.Encoding.ASCII.GetBytes("a")
writer = New PdfWriter(PDF, New WriterProperties().SetStandardEncryption(array, array, EncryptionConstants.ALLOW_PRINTING,
EncryptionConstants.ENCRYPTION_AES_256))
HtmlConverter.ConvertToPdf(HTML, writer, converterProperties)
Next
End Sub
的成员如果我评论说的代码和运行两行ning我的程序一个错误出现在转换器代码中,即(HtmlConverter.ConvertToPdf(HTML,writer,converterProperties))
错误是:“.pdf间接对象属于其他PDF文档。复制对象到当前的PDF文档。”
因为coverterproperties是在退出循环这个错误出现的。如果我把它工作正常,内环路这一切属性...但是这是正确的性能明智..?
请帮我解决这三个错误..?
如何提供HTML我不知道..? – NARAN
我已经在ItextSharp中使用Htmlworker ...但这不是问题...我问了iText7如何提高性能。 – NARAN
在你引用的路径:stackoverflow.com/q/44514437/766786有没有解决方案.. – NARAN