在我的应用程序中，我从html内容生成报告。为此，我使用带有XMLWorker 5.5.0的iTextPDF库5.5.0。最终用户可以使用tinyMC编辑器设计报告的内容（页眉，页脚，主题）。我将这些HTML内容存储在DB中。请注意，此HTML内容可能包含图像，表格或tinyMC允许的任何内容。现在，当用户尝试生成报告时，我从数据库中获取数据，并尝试使用下面给出的代码从HTML生成页眉和页脚。
/**
* Adds the header and the footer.
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(
* com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onEndPage(PdfWriter writer, Document document) {
Phrase footerPhrase = new Phrase();
DBFooter = "<table width='200 border='1' cellpadding='1' cellspacing='1'><tbody><tr><td>content1</td><td>content2</td></tr><tr><td> </td><td> </td>
</tr><tr><td>jhvhjvh</td><td><img src='D:\DemoApp\images\User1.png' width='48' height='48' alt='' /></td></tr></tbody></table>
<p style='text-align: center;'>This is the footer</p>"
CSSResolver cssResolver = new StyleAttrCSSResolver();
CssFile cssFile = XMLWorkerHelper.getCSS(new ByteArrayInputStream(CSS.getBytes()));
cssResolver.addCss(cssFile);
// HTML
HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
// Pipelines
ElementList elements = new ElementList();
ElementHandlerPipeline pdf = new ElementHandlerPipeline(elements, null);
HtmlPipeline html = new HtmlPipeline(htmlContext, pdf);
CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
// XML Worker
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker);
try {
p.parse(new ByteArrayInputStream(DBFooter.toString().getBytes()));
} catch (IOException e) {
}
footerPhrase.addAll(elements);
Rectangle rect = writer.getBoxSize("art");
switch (writer.getPageNumber() % 2) {
case 0:
ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_RIGHT, header[0], rect.getRight(),
rect.getTop(), 0);
break;
case 1:
ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_LEFT, header[1], rect.getLeft(),
rect.getTop(), 0);
break;
}
ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_CENTER, footerPhrase,
(rect.getLeft() + rect.getRight()) / 2, rect.getBottom() - 50, 0);
}
我已跟随this link添加页眉页脚。并按上述方式更改了onEndPage函数。
问题是上面的代码只打印＆＃34; 这是页脚＆＃34;从页脚的内容。它没有显示表格。如何在页眉/页脚中添加HTML内容。
请注意，我可以在报告正文中显示html内容（包括表/图像等），但不能在页眉/页脚中显示。
答案 0 :(得分：0)
使用itext sharp xml worker的页面事件和元素处理程序管理在C＃中添加html页眉和页脚
/// <summary>
/// returns pdf in bytes.
/// </summary>
/// <param name="contentsHtml">contents.</param>
/// <param name="headerHtml">header contents.</param>
/// <param name="footerHtml">footer contents.</param>
/// <returns></returns>
public Byte[] GetPDF(string contentsHtml, string headerHtml, string footerHtml)
{
// Create a byte array that will eventually hold our final PDF
Byte[] bytes;
// Boilerplate iTextSharp setup here
// Create a stream that we can write to, in this case a MemoryStream
using (var ms = new MemoryStream())
{
// Create an iTextSharp Document which is an abstraction of a PDF but **NOT** a PDF
using (var document = new Document(PageSize.A4, 40, 40, 120, 120))
{
// Create a writer that's bound to our PDF abstraction and our stream
using (var writer = PdfWriter.GetInstance(document, ms))
{
// Open the document for writing
document.Open();
var headerElements = new HtmlElementHandler();
var footerElements = new HtmlElementHandler();
XMLWorkerHelper.GetInstance().ParseXHtml(headerElements, new StringReader(headerHtml));
XMLWorkerHelper.GetInstance().ParseXHtml(footerElements, new StringReader(footerHtml));
writer.PageEvent = new HeaderFooter(headerElements.GetElements(), footerElements.GetElements());
// Read your html by database or file here and store it into finalHtml e.g. a string
// XMLWorker also reads from a TextReader and not directly from a string
using (var srHtml = new StringReader(contentsHtml))
{
// Parse the HTML
iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, srHtml);
}
document.Close();
}
}
// After all of the PDF "stuff" above is done and closed but **before** we
// close the MemoryStream, grab all of the active bytes from the stream
bytes = ms.ToArray();
}
return bytes;
}
}
页面事件和元素处理程序代码在这里
public partial class HeaderFooter : PdfPageEventHelper
{
private ElementList HeaderElements { get; set; }
private ElementList FooterElements { get; set; }
public HeaderFooter(ElementList headerElements, ElementList footerElements)
{
HeaderElements = headerElements;
FooterElements = footerElements;
}
public override void OnEndPage(PdfWriter writer, Document document)
{
base.OnEndPage(writer, document);
try
{
ColumnText headerText = new ColumnText(writer.DirectContent);
foreach (IElement e in HeaderElements)
{
headerText.AddElement(e);
}
headerText.SetSimpleColumn(document.Left, document.Top, document.Right, document.GetTop(-100), 10, Element.ALIGN_MIDDLE);
headerText.Go();
ColumnText footerText = new ColumnText(writer.DirectContent);
foreach (IElement e in FooterElements)
{
footerText.AddElement(e);
}
footerText.SetSimpleColumn(document.Left, document.GetBottom(-100), document.Right, document.GetBottom(-40), 10, Element.ALIGN_MIDDLE);
footerText.Go();
}
catch (DocumentException de)
{
throw new Exception(de.Message);
}
}
}
public class HtmlElementHandler : IElementHandler
{
public ElementList Elements { get; set; }
public HtmlElementHandler()
{
Elements = new ElementList();
}
public ElementList GetElements()
{
return Elements;
}
public void Add(IWritable w)
{
if (w is WritableElement)
{
foreach (IElement e in ((WritableElement)w).Elements())
{
Elements.Add(e);
}
}
}
}