问题描述
我正在尝试使用Itext XMLWorkerHelper将HTML(带有外部CSS)转换为PDF,每当XMLWorkerHelper解析格式错误的HTML时,都会遇到运行时异常.例如:
I am trying to convert HTML(with external CSS) into PDF using Itext XMLWorkerHelper, am facing the run-time exception whenever XMLWorkerHelper parses a malformed HTML. For example:
以下html的输入标签未关闭:XMLWorkerHelper无法解析并引发运行时异常.
The html below has input tag not closed : and XMLWorkerHelper cannot parse and throws run-time exception.
如果我尝试使用正确的HTML输入标签,它将正常工作.
if i try with proper HTML input tag enclosed,it works fine.
如何使用Itext将格式错误或复杂的HTML(以及CSS)转换为PDF.
How can i convert malformed or complex HTML (along with css) to PDF using Itext.
下面是我的代码:
var test_html = File.ReadAllText("C:/Desking _ Lender Program - Dealertrack.html");
var test_css = File.ReadAllText("C:/login.css");
using (var msCss = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(test_css)))
{
using (var msHtml = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(test_html)))
{
//Parse the HTML
try
{
iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msHtml, msCss);
}
catch { }
}
}
推荐答案
您是否决定使用iText7还是iTextSharp(5.xx)尚不清楚,但这是使用 HtmlAgilityPack 清理格式错误的HTML:
It's a bit unclear whether you've decided to use iText7 or iTextSharp (5.x.x), but here's a simple example of the latter using HtmlAgilityPack to clean up malformed HTML:
var malformedHtml = @"
<h1>Malformed HTML</h1>
<p>A paragraph <b><span>with improperly nested tags</b></span></p><hr>
<table><tr><td>Cell 1, row 1</td><td>Cell 1, row 2";
HtmlDocument h = new HtmlDocument()
{
OptionFixNestedTags = true, OptionWriteEmptyNodes = true
};
h.LoadHtml(malformedHtml);
string css = @"
h1 { font-size:1.4em; }
hr { margin-top: 4em; margin-bottom: 2em; color: #ddd; }
table { border-collapse: collapse; }
table, td { border: 1px solid black; }
td { padding: 4px; }
span { color: red; }";
using (var stream = new MemoryStream())
{
using (var document = new Document())
{
PdfWriter writer = PdfWriter.GetInstance(document, stream);
document.Open();
using (var htmlStream = new MemoryStream(Encoding.UTF8.GetBytes(h.DocumentNode.WriteTo())))
{
using (var cssStream = new MemoryStream(Encoding.UTF8.GetBytes(css)))
{
XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, htmlStream, cssStream);
}
}
}
File.WriteAllBytes(OUTPUT, stream.ToArray());
}
PDF输出:
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