HTML到PDF转换 - “无法加载XML资源”错误

Question

I'm trying to convert strict XHTML to PDF using flying saucer and iText. 我正在尝试使用飞碟和iText将严格的XHTML转换为PDF。 I've validated XHTML and path of input and output file are precise. 我已经验证了XHTML，输入和输出文件的路径是精确的。 I have no goddamn clue why this is throwing an exception on renderer.setDocument("file:/c:/example/First.html") line. 我没有该死的线索，为什么这会在renderer.setDocument（“file：/ c：/example/First.html”）行上抛出异常。

My Class: 我的课：

package flyingsaucerpdf;
    import java.io.*;
    import org.xhtmlrenderer.pdf.ITextRenderer;
    import com.lowagie.text.DocumentException;

    public class FirstDoc {
     public static void main(String[] args) throws IOException, DocumentException
         {
                 String outputFile = "results/firstdoc.pdf";
                 OutputStream os = new FileOutputStream(outputFile);
                 ITextRenderer renderer = new ITextRenderer();
             try
             {
                 renderer.setDocument("file:/c:/example/First.html");
             }
             catch( Exception e )
             {
                 System.out.println("Me not create file. Error:"+e.getMessage());
             }
             renderer.layout();
             renderer.createPDF(os);

             os.close();
         }

    }

My Exception: 我的例外：

ERROR: ''Me not create file. 错误：''我不创建文件。 Error:Can't load the XML resource (using TRaX transformer). 错误：无法加载XML资源（使用TRaX转换器）。 java.lang.NullPointerException 显示java.lang.NullPointerException

Exception in thread "main" java.lang.NullPointerException at org.xhtmlrenderer.layout.BoxBuilder.createRootBox(BoxBuilder.java:81) at org.xhtmlrenderer.pdf.ITextRenderer.layout(ITextRenderer.java:152) at flyingsaucerpdf.FirstDoc.main(FirstDoc.java:31) 位于org.xhtmlrenderer.layout.BoxBuilder.createRootBox（BoxBuilder.java:81）的主题“main”java.lang.NullPointerException中的异常，位于orings.xhtmlrenderer.pdf.ITextRenderer.layout（ITextRenderer.java:152）的flyingsaucerpdf.FirstDoc。主（FirstDoc.java:31）

My XHTML: 我的XHTML：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
<style type="text/css"> b { color: green; } </style>
</head>
<body>
<p>
<b>Greetings Earthlings!</b>
We've come for your Java.
</p>
</body>
</html>

Any help? 有帮助吗？

Answer 1

Is your virtual machine online? 您的虚拟机在线吗？ It may be possible that the renderer/parser tries to load the linked resources like the 渲染器/解析器可能会尝试加载链接的资源，如

http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd

that are needed to ensure that the xml (xhtml) you provide is correct. 确保您提供的xml（xhtml）正确所需。

In a Servlet I do the following that seems to work (some online resources are made available within my own filesystem because the server has no internet connection): 在Servlet中，我执行以下似乎工作（一些在线资源在我自己的文件系统中可用，因为服务器没有Internet连接）：

final DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
builder.setEntityResolver(new EntityResolver() {
  @Override
  public InputSource resolveEntity(String publicId, String systemId)
      throws SAXException, IOException {
    if (systemId.contains("xhtml1-transitional.dtd")) {
      return new InputSource(new FileReader(realPath + "/WEB-INF/dtd/xhtml1-transitional.dtd"));
    } else if (systemId.contains("xhtml-lat1.ent")) {
      return new InputSource(new FileReader(realPath + "/WEB-INF/dtd/xhtml-lat1.ent"));
    } else if (systemId.contains("xhtml-symbol.ent")) {
      return new InputSource(new FileReader(realPath + "/WEB-INF/dtd/xhtml-symbol.ent"));
    } else if (systemId.contains("xhtml-special.ent")) {
      return new InputSource(new FileReader(realPath + "/WEB-INF/dtd/xhtml-special.ent"));
    } else {
      return null;
    }
  }
});
final ByteArrayInputStream inputStream = new ByteArrayInputStream(html.getBytes("UTF-8"));
final Document doc = builder.parse(inputStream);
inputStream.close();
final ITextRenderer renderer = new ITextRenderer(26f * 4f / 3f, 26);
renderer.setDocument(doc, request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort());
renderer.layout();

This basically sets up a DocumentBuilder and then parses my document (which is in String format and represented by the variable html ) 这基本上设置了一个DocumentBuilder然后解析我的文档（它是String格式并由变量html表示）

HTML到PDF转换 - “无法加载XML资源”错误

问题描述

1 个解决方案

解决方案1
2 已采纳 2012-05-22 13:42:25

HTML到PDF转换 - “无法加载XML资源”错误

问题描述

1 个解决方案

解决方案1 2 已采纳 2012-05-22 13:42:25

解决方案1
2 已采纳 2012-05-22 13:42:25