ITextRenderer.setDocumentFromString(html) 导致 javax.xml.transform.TransformerException

Question

我正在用 JSoup 转换一些 HTML。在生成最终 HTML 之后，我想将其渲染成 pdf 文件。为此，我正在使用 Flying saucer 库。

Html 我正在尝试渲染的示例：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head> 
<title></title> 
<meta http-equiv="X-UA-Compatible" content="IE=edge" /> 
<meta name="viewport" content="width=device-width, initial-scale=1" /> 
...

将 html 转为 pdf 的方法：

private void createPdfFile(String html, String fileName) throws IOException, DocumentException {
    ITextRenderer renderer = new ITextRenderer();

    renderer.setDocumentFromString(html);
    renderer.layout();

    FileOutputStream fos = new FileOutputStream(fileName);
    renderer.createPDF( fos );
    fos.close();
    System.out.println( "File 2: '" + fileName + "' created." );
    }

错误日志：

org.xhtmlrenderer.util.XRRuntimeException: Can't load the XML resource (using TRaX transformer). org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 64; The system identifier must begin with either a single or double quote character.
    at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:191)
    at org.xhtmlrenderer.resource.XMLResource.load(XMLResource.java:75)
    at org.xhtmlrenderer.pdf.ITextRenderer.setDocumentFromString(ITextRenderer.java:157)
    at main.Main.createPdfFile(Main.java:106)
    at main.Main.getEmailAsset(Main.java:97)
    at main.ServletMain.doGet(ServletMain.java:52)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.transform.TransformerException: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 64; The system identifier must begin with either a single or double quote character.
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown Source)
    at org.xhtmlrenderer.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:189)
    ... 27 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 64; The system identifier must begin with either a single or double quote character.
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(Unknown Source)
    ... 30 more

知道为什么会这样吗？

Answer 1

您需要将 DTD URI 括在引号中 - 您当前不平衡：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

在您现有的代码中，您在 http://www.w3...

之前缺少 "

Answer 2

检查标签属性中的引号。我没有 " 标记，这对我造成了类似的错误。

ITextRenderer.setDocumentFromString(html) 导致 javax.xml.transform.TransformerException

ITextRenderer.setDocumentFromString(html) is causing javax.xml.transform.TransformerException

java

html

xml

pdf

flying-saucer