SAXParser: handle only specific parent childs

问题

I have xml structure

<data>
   <id>id</id>
   <title>dataTitle</title>
   <entry>
      <title>title1</title>
   </entry>
   <entry>
      <title>title2</title>
   </entry>
</data>

And I want to parse it and save in list only title elements under entry. How can I check in endElement that title is under entry? Not I have NullPointerExpception because parser tries to save title which is data child.

@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
    elementOn = true;
    if ("entry".equals(localName)) {
        song = new Song();
    }
}


@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
    elementOn = false;

    if ("title".equalsIgnoreCase(localName)) {
        song.setTitle(elementValue);
    } else if ("entry".equalsIgnoreCase(localName)) {
        songList.add(song);
    }
}

回答1:

In this case, you can use a stack to push and pop the cData at startElement and endElement events respectively. Put a check in the endElement event so that only the data you require is stored

来源：https://stackoverflow.com/questions/16543594/saxparser-handle-only-specific-parent-childs