如何解决Woodstox - 当文档没有根时尝试写入 END_DOCUMENT
这是我第一次使用 woodstox 编写 XML,但在添加 EndDocument 时出现错误。
我的代码:
private static XMLOutputFactory oF = com.ctc.wstx.stax.WstxOutputFactory.newInstance();
private static XMLInputFactory iF = com.ctc.wstx.stax.WstxInputFactory.newInstance();
iF.setProperty(XMLInputFactory.SUPPORT_DTD,false);
iF.setProperty("javax.xml.stream.isSupportingExternalEntities",false);
protected OutputStream writeXML(InputStream iS) throws XMLStreamException {
ByteArrayOutputStream oS = new ByteArrayOutputStream();
try {
XMLEventWriter eW;
XMLEventFactory eF = com.ctc.wstx.stax.WstxEventFactory.newInstance();
eW = oF.createXMLEventWriter(oS);
eW.add(eF.createStartDocument(););
XMLEventReader eR = iF.createXMLEventReader(iS);
while(eR.hasNext()) {
XMLEvent event = eR.nextEvent();
if (event.isstartElement()) {
}
else if (event.isEndElement()) {
}
else if (event.getEventType() != XMLEvent.START_DOCUMENT && event.getEventType() != XMLEvent.END_DOCUMENT) {
if (event.isstartElement() {
eW.add(event);
}
else if (event.isEndElement()) {
eW.add(event);
}
}
eR.close();
}
eW.add(eF.createEndDocument());
eW.close();
}
catch (Exception e) { e.printstacktrace(); }
return oS;
}
错误:
javax.xml.stream.XMLStreamException: Trying to write END_DOCUMENT when document has no root (ie. trying to output empty document).
at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1589)
at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1618)
at com.ctc.wstx.sw.BaseStreamWriter._finishDocument(BaseStreamWriter.java:1444)
at com.ctc.wstx.sw.BaseStreamWriter.writeEndDocument(BaseStreamWriter.java:550)
at org.codehaus.stax2.ri.Stax2EventWriterImpl.add(Stax2EventWriterImpl.java:66)
XML 是这样写的:
<?xml version="1.0"?>
<manifest:manifest xmlns:manifest="a" manifest:version="1.2">
<manifest:file-entry manifest:full-path="/" manifest:media-type="b.text" manifest:version="1.2"></manifest:file-entry>
<manifest:file-entry manifest:full-path="c.xml" manifest:media-type=""></manifest:file-entry>
<manifest:file-entry manifest:full-path="d/" manifest:media-type="e"></manifest:file-entry>
<manifest:file-entry manifest:full-path="f.png" manifest:media-type="image/png"></manifest:file-entry>
<manifest:file-entry manifest:full-path="g.xml" manifest:media-type="text/xml"></manifest:file-entry>
<manifest:file-entry manifest:full-path="h.xml" manifest:media-type="text/xml"></manifest:file-entry>
<manifest:file-entry manifest:full-path="i.xml" manifest:media-type="text/xml"></manifest:file-entry>
<manifest:file-entry manifest:full-path="j.rdf" manifest:media-type="application/rdf+xml"></manifest:file-entry>
<manifest:file-entry manifest:full-path="l.xml" manifest:media-type="text/xml"></manifest:file-entry>
</manifest:manifest>
我试图禁用验证,将属性 P_OUTPUT_VALIDATE_STRUCTURE、P_OUTPUT_VALIDATE_CONTENT、P_OUTPUT_VALIDATE_NAMES、P_OUTPUT_VALIDATE_ATTR、P_OUTPUT_FIX_CONTENT 设置为 false,但我收到此错误:
javax.xml.stream.XMLStreamException: No open start element,when trying to write end element
at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1589)
at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1618)
at com.ctc.wstx.sw.BaseNsstreamWriter.doWriteEndTag(BaseNsstreamWriter.java:664)
at com.ctc.wstx.sw.BaseNsstreamWriter.writeEndElement(BaseNsstreamWriter.java:291)
at com.ctc.wstx.sw.BaseStreamWriter._finishDocument(BaseStreamWriter.java:1457)
at com.ctc.wstx.sw.BaseStreamWriter.writeEndDocument(BaseStreamWriter.java:550)
at org.codehaus.stax2.ri.Stax2EventWriterImpl.add(Stax2EventWriterImpl.java:66)
禁用 P_AUTOMATIC_END_ELEMENTS,出现第一个错误。
我做错了什么?
解决方法
看起来处理坏了;不知道你为什么有这个:
if (event.isStartElement()) {
}
else if (event.isEndElement()) {
}
但是这会阻止元素被写入,然后你有空文档......这不是有效的 XML。
我认为这是一个错误,因为上面代码片段之后的 else
分支正在运行,好像开始元素可能会出现(但由于前面的语句而不能)。
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