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1¡¢ParserÀà
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2¡¢Node½Ó¿Ú
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<span> ----Tag node
text ----Text Node
</span>
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3¡¢NodeFilter
±êÇ©¹ýÂËÆ÷½Ó¿Ú£¬ÓÃÀ´ÔÚparser»òNodeListÖйýÂ˳öÐèÒªµÄijһÀànode¡£
4¡¢NodeList
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ʵÏÖgetElementByID¹¦ÄÜ
<code>
public class NodeIDFilter implements NodeFilter {
private String id;
public NodeIDFilter(String id)
{
this.id=id;
}
public boolean accept(Node node) {
if(node instanceof Tag)
{
if(!((Tag)node).isEndTag())
{
String s=((Tag)node).getAttribute("id");
if(s!=null)
return s.equals(this.id);
}
}
return false;
// throw new UnsupportedOperationException("Not supported yet.");
}
}
public class MHTMLParser
{
....
protected Node getElementById(String id) throws ParserException
{
//this.myparser.reset();
if(this.mNodeList==null||this.mNodeList.size()==0) return null;
NodeIDFilter nodef = new NodeIDFilter(id);
NodeList nl = this.mNodeList.extractAllNodesThatMatch(nodef,true);
//
if (nl.size() != 0)
{
return nl.elementAt(0);
}
return null;
}
}
</code>
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