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1¡¢ParserÀà
½âÎöÆ÷Ö÷À࣬¸ºÔðÔØÈëHTML´úÂë²¢½âÎö¡£
2¡¢Node½Ó¿Ú
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<span> ----Tag node
text ----Text Node
</span>
Îı¾ºÍ±êÇ©¶¼ÊǶÀÁ¢µÄnodeÔªËØ¡£textÎı¾ÊDZêÇ©spanµÄchild node
3¡¢NodeFilter
±êÇ©¹ýÂËÆ÷½Ó¿Ú£¬ÓÃÀ´ÔÚparser»òNodeListÖйýÂ˳öÐèÒªµÄijһÀànode¡£
4¡¢NodeList
Êý¾Ý½á¹¹£¬±íʾNodeµÄ¼¯ºÏ
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ParserºÍNodeList¶¼ÓÐÒ»¸öÃûΪextractAllNodesThatMatch(NodeFilter filter)µÄ·½·¨ÓÃÀ´¹ýÂ˳ö·ûºÏij¸öÌõ¼þµÄnode£¬µ«ÊÇÆäÄÚ²¿µÄʵÏÖ»úÖÆ²»Í¬¡£
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¶øNodeListÊÇÔÚÄÚ²¿µÄÊý×éÉϽøÐÐÑ­»·Åжϣ¬Òò´Ë¸÷´Îµ÷ÓÃÖ®¼ä²»»á»¥ÏàÓ°Ï죬ЧÂÊÒ²±ÈParserµÄ¸ß£¬ÍÁ½¨Ê¹Óá£
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<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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public static void main(String[] args) {
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