Question

我遇到一个问题，我在程序中使用以下库将Html转换为pdf。

itextpdf.jar - 5.4.1版本

xmlworker - 5.4.1版本

我为很多HTML测试了我的代码并且工作正常，但其中一个HTML无效并抛出以下异常..请仔细研究一下，让我们知道你们是否知道任何解决方案。

java.lang.IllegalArgumentException: Element not allowed.  at com.itextpdf.text.pdf.ColumnText.addElement(ColumnText.java:471)
 at com.itextpdf.text.pdf.PdfPCell.addElement(PdfPCell.java:283)
 at com.itextpdf.tool.xml.html.table.TableData.end(TableData.java:151)
 at com.itextpdf.tool.xml.html.AbstractTagProcessor.endElement(AbstractTagProcessor.java:189)
 at com.itextpdf.tool.xml.pipeline.html.HtmlPipeline.close(HtmlPipeline.java:206)
 at com.itextpdf.tool.xml.XMLWorker.endElement(XMLWorker.java:141)
 at com.itextpdf.tool.xml.parser.XMLParser.endElement(XMLParser.java:395)
 at com.itextpdf.tool.xml.parser.state.ClosingTagState.process(ClosingTagState.java:70)
 at com.itextpdf.tool.xml.parser.XMLParser.parseWithReader(XMLParser.java:235)
 at com.itextpdf.tool.xml.parser.XMLParser.parse(XMLParser.java:213)
 at com.cisco.wem.transformation.HtmlProcessor.generatePDF(HtmlProcessor.java:1728)
 at com.cisco.wem.transformation.HtmlProcessor.processHtml(HtmlProcessor.java:292)
 at com.cisco.wem.transformation.HtmlProcessor.execute(HtmlProcessor.java:207)
 at com.cisco.wem.transformation.HtmlProcessor.run(HtmlProcessor.java:1451)
 at java.lang.Thread.run(Thread.java:662)

我看到其中一个博客，他们说要使用以下代码段，但我不知道在我的代码中将其用于何处

for (Element e : elements) {
     if (!ColumnText.isAllowedElement(e))
         continue;
     // do stuff
}

这是我的代码：

public String generatePDF(String tempFolder,String completeHtmlFilePath,NodeBO renditionRequestBO)throws FileNotFoundException, IOException, DocumentException,
 CssResolverException {

  << some code stuff here>>

  com.itextpdf.text.Document document = new com.itextpdf.text.Document();
  PdfWriter writer = PdfWriter.getInstance(document,
   new FileOutputStream(pdfFileNameWithPath));
  document.open();

  HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
  //htmlContext.setLastMarginBottom(100.0f);
  htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
  CSSResolver cssResolver = XMLWorkerHelper.getInstance()
    .getDefaultCssResolver(true);


  Pipeline<?> pipeline = new CssResolverPipeline(cssResolver,
    new HtmlPipeline(htmlContext, new PdfWriterPipeline(document,
      writer)));

  XMLWorker worker = new XMLWorker(pipeline, true);


  XMLParser p = new XMLParser(worker);

  File input = new File(completeHtmlFilePath);
  p.parse(new InputStreamReader(new FileInputStream(input), "UTF-8"));

  document.close();

  return pdfFileNameWithPath;


 }
}

由于斯

这是我获得此异常的HTML代码段，您只能使用下面的表格元素。

<pre><code><table class="stepTable" border="0" cellpadding="3"  
cellspacing="0"     
width="90%"><ol><tr><td align="left" valign="top"><b>Step 1</b>  
 </td><td valign="top" class="stepexpand">
 <a name="F3BD336EF5F6499EAB5C6A39AA81852F"><!-- --></a><span>Log in to Cisco
 CCO 
 <a href="http://www.cisco.com/cgi-bin/tablebuild.pl/sccm"  
target="_blank">http://www.cisco.com/cgi-bin/tablebuild.pl/sccm</a>. 
 </span></td></tr>
 <tr><td align="left" valign="top"><b>Step 2</b>  
 </td><td valign="top" class="stepexpand"><a name="24BB6E38029E4A7493CE85443C212D09"><!-- --></a><span>Enter your Cisco
 CCO password when prompted. 
 </span></td></tr>
 <tr><td align="left" valign="top"><b>Step 3</b>  
 </td><td valign="top" class="stepexpand"><a name="step_C3603915B0C2485684A1AD73989307D9">
 <!-- -- ></a><span><span>Download the SCMS-CM
Installation software package (scms-cm-v500-b100-linux-64.tar).</span> 
</span><br/></td></tr>
<tr><td align="left" valign="top"><b>Step 4</b>  
</td><td valign="top" class="stepexpand"><a  
name="4818AB7377474E80824041ED0C3F240B"><!-- --></a><span>Extract the
 package into a temporary directory. 
 </span>  
 <br/><br/><b>Example:</b> 
 <pre class="codeblock"># 
 <kbd  class="userinput"><b>mkdir /usr/tmp/cm_install_temp</b></kbd></pre>
 <br/><br/><b>Example:</b> 
 <pre class="codeblock"># 
 <kbd  class="userinput"><b>cd /usr/tmp/cm_install_temp</b></kbd></pre>
 <br/><br/><b>Example:</b> 
 <pre class="codeblock"># <kbd class="userinput"><b>tar  
 xvf ../cm_full_package.tar</b></kbd></pre>
 </td></tr> test
 </ol></table></code></pre>

Answer 1

它可能是HTML vs XHTML问题。 iText需要输入XHTML，它比HTML更严格。例如，不允许使用br元素。您还需要正确关闭元素。

您可以在使用开源项目“Tidy”http://tidy.sourceforge.net/

将HTML发送到iText之前将其转换为XHTML

public static String convertHtmlToXhtml(String html) {
    Tidy tidy = new Tidy(); 
    tidy.setXHTML(true); 
    tidy.setDocType("omit");
    InputStream inputStream = new StringBufferInputStream(html);
    OutputStream outputStream = new ByteArrayOutputStream();
    tidy.parse(inputStream, outputStream); 
    return outputStream.toString();
}

java.lang.IllegalArgumentException：不允许使用元素

1 个答案: