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XPath Óï·¨
2007-06-05 17:24
XPath Óï·¨
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XPath Nodes(½Úµã) XPath Axes
XPath uses path expressions to select nodes or node-sets in an XML document. The node is selected by following a path or steps.
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The XML Example Document
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We will use the following XML document in the examples below.
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<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book>
   <title lang="eng">Harry Potter</title>
   <price>29.99</price>
</book>
<book>
   <title lang="eng">Learning XML</title>
   <price>39.95</price>
</book>
</bookstore>
Selecting Nodes
ѡȡ½Úµã
XPath uses path expressions to select nodes in an XML document. The node is selected by following a path or steps. The most useful path expressions are listed below:
XPathͨ¹ý·¾¶±í´ïʽÔÚXMLÎĵµÖÐѡȡ½Úµã¡£¿ÉÒÔͨ¹ýÒ»ÌõÓï¾ä»òÏàÓ¦µÄ²½Öèѡȡһ¸ö½Úµã¡£ÏÂÃæÁгöÁË×ʹÓõÄ·¾¶±í´ïʽ£º
Expression
±í´ïʽ
Description
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nodename
Selects all child nodes of the node
ѡȡ½ÚµãϵÄËùÓÐ×Ó½Úµã
/
Selects from the root node
ѡȡ¸ù½Úµã
//
Selects nodes in the document from the current node that match the selection no matter where they are
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.
Selects the current node
ѡȡµ±Ç°½Úµã
..
Selects the parent of the current node
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@
Selects attributes
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Examples
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In the table below we have listed some path expressions and the result of the expressions:
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Path Expression
±í´ïʽ
Result
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bookstore
Selects all the child nodes of the bookstore element
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/bookstore
Selects the root element bookstore
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var createXML = function (str) {
if (typeof DOMParser !== "undefined") {
return (new DOMParser()).parsefromString(str, "application/xml");
}else if (typeof ActiveXObject != "undefined") {
if (typeof arguments.callee.activeXString !== "string" ......

XML ¶Á

StringBuilder output = new
StringBuilder();
String xmlString =
@"<bookstore>
<book genre='novel' ISBN='10-861003-324'>
<title>The Handmaid's Tale</title>
<price>19.95</price>
</book>
<book genre='novel' ISBN='1-861001-57-5' ......

JavaÓëXMLÁªºÏ±à³ÌÖ®DOMƪ


JavaÓëXMLÁªºÏ±à³ÌÖ®DOMƪ


DOM³õ²½

DOM
ÊÇDocument Object
ModelµÄËõд£¬¼´Îĵµ¶ÔÏóÄ£ÐÍ¡£Ç°ÃæËµ¹ý£¬XML½«Êý¾Ý×é֯Ϊһ¿ÅÊ÷£¬ËùÒÔDOM¾ÍÊǶÔÕâ¿ÅÊ÷µÄÒ»¸ö¶ÔÏóÃèÐð¡£Í¨Ë×µÄ˵£¬¾ÍÊÇͨ¹ý½âÎöXMLÎĵµ£¬Îª
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xml½âÎö

xml
<mime>
<content>
<type>text/plain</type>
<big>357</big>
<text>D:\\cybercourttext2009101410241364.txt</text>
</content>
<content>
<type>text/plain</type>
<big>357</big>
<text>D:\\cybercourttext2009 ......
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