RE:大XML文件

Question

关于Big XML文件的后续问题:

首先,非常感谢你的回答.之后......我做错了什么？这是我的使用SAX的类:

public class SAXParserXML extends DefaultHandler {
  public static void ParcourXML() {

      DefaultHandler handler = new SAXParserXML();
      SAXParserFactory factory = SAXParserFactory.newInstance();
      try {
          String URI = "dblp.xml";
          SAXParser saxParser = factory.newSAXParser();
          saxParser.parse(URI,handler);
      } catch (Throwable t) {
     t.printStackTrace ();
       }
  }



  public void startElement (String namespaceURI,String simpleName,String qualifiedName,Attributes attrs) throws SAXException {
  }
  public void endElement (String namespaceURI,String simpleName,String qualifiedName) throws SAXException {

  }
}

你可以看到我对我的XML文件什么都不做但它给出了这个错误:

java.lang.OutOfMemoryError: Java heap space
    at com.sun.org.apache.xerces.internal.util.XMLStringBuffer.append(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.refresh(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.invokeListeners(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.peekChar(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at javax.xml.parsers.SAXParser.parse(Unknown Source)
    at javax.xml.parsers.SAXParser.parse(Unknown Source)
    at SAXParserXML.ParcourXML(SAXParserXML.java:30)
    at Main.main(Main.java:28)

我也试过Stax ......同样的错误......我该怎么办？此外,我将Java堆大小增加到1260M

java -Xmx1260M SAXParserXML

XML文件具有以下形式:

<dblp> 
   <incollection> 
      <author>... </author> 
      .... 
      <author>... </author> 
      #other tags-i'm interested only by <author>#
      ... 
   </incollection> 
   <incollection> 
   # the same thing# 
   </incollection> 
   .... 
</dblp> 

你可以找到原始文件:http://dblp.uni-trier.de/xml/

谢谢

Answer 1

Java 1.6 有一个错误,它显示了完全相同的堆栈跟踪,并且它现在已经不固定了.较新的Xerces版本似乎没问题.

对于那些仍然包含大量结构的大型文档,您可以考虑使用pull-parsing,即解析部分结构,例如使用StAX.