xmlѡȡµ¥¸ö½ÚµãÄÚÈݽâ¾ö°ì·¨
XPath Óï·¨
2007-06-05 17:24
XPath Óï·¨
×÷Õß:w3pop.com ·Òë/ÕûÀí:w3pop.com ·¢²¼:2007-04-29 ä¯ÀÀ:674 :: ::
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.
XPath ͨ¹ý·¾¶±í´ïʽ´ÓXMLÎĵµÖÐѡȡ½Úµã»ò½ÚµãÉèÖ᣿ÉÒÔͨ¹ýÒ»ÌõÓï¾ä»òÏàÓ¦µÄ²½Öèѡȡһ¸ö½Úµã¡£
The XML Example Document
XMLÎĵµÊµÀý
We will use the following XML document in the examples below.
ÎÒÃǽ«ÔÚ½ÓÏÂÀ´µÄÎÄÕÂÖÐÒýÓÃÕâ¸öXMLÎĵµ¡£
<?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
×¢ÊÍ
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
ѡȡÎĵµÖÐËùÓзûºÏÌõ¼þµÄ½Úµã£¬²»¹Ü¸Ã½ÚµãλÓںδ¦
.
Selects the current node
ѡȡµ±Ç°½Úµã
..
Selects the parent of the current node
ѡȡµ¥Ç°½ÚµãµÄ¸¸½Úµã
@
Selects attributes
ѡȡÊôÐÔ
Examples
ʵÀý
In the table below we have listed some path expressions and the result of the expressions:
ÔÚÏÂÃæµÄ±í¸ñÖУ¬ÎÒÃÇÁгöÁËһЩ·¾¶±í´ïʽ¼°ÆäÔËÐеĽá¹û£º
Path Expression
±í´ïʽ
Result
½á¹û
bookstore
Selects all the child nodes of the bookstore element
ѡȡbookstoreÔªËØµÄËùÓÐ×Ó½Úµã
/bookstore
Selects the root element bookstore
Ñ
Ïà¹ØÎĵµ£º
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' ......
SAX¸ÅÄî
SAXÊÇSimple API for XML
µÄËõд£¬Ëü²¢²»ÊÇÓÉW3C¹Ù·½ËùÌá³öµÄ±ê×¼£¬¿ÉÒÔ˵ÊÇ“Ãñ¼ä”µÄÊÂʵ±ê×¼¡£Êµ¼ÊÉÏ£¬ËüÊÇÒ»ÖÖÉçÇøÐÔÖʵÄÌÖÂÛ²úÎï¡£ËäÈ»Èç´Ë£¬ÔÚXMLÖжÔSAXµÄÓ¦ÓÃË¿ºÁ²»±ÈDOMÉÙ£¬¼¸ºõËùÓеÄXML½âÎöÆ÷¶¼»áÖ§³ÖËü¡£
Óë
DOM±È½Ï¶øÑÔ£¬SAXÊÇÒ»ÖÖÇáÁ¿Ð͵ķ½·¨¡£ÎÒÃÇÖªµÀ£¬ÔÚ´¦ÀíDOMµÄʱºò£¬Î ......
LSParserFilter---ÔØÈëÓë±£´æ
Ó¦ÓÃorg.w3c.dom ʵÏÖXMLµÄÔØÈëÓë±£´æÊµÀý
/**
* ʵÏÖDOM3µÄLS(Load & Save)¹¦ÄÜ
*
* @author S.Well
* @see org.w3c.dom.DOMErrorHandler
* @see org.w3c.dom.ls.LSParserFilter
*/
public class XML_LS implements DOMErrorHandler, LSParserFilter {
private static ......
ÔÎÄÁ´½Ó£ºhttp://www.cnblogs.com/ding0910/archive/2007/07/12/815407.html
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.Services;
using BX.Interface;
......
XMLÏÖÔÚÒѾ³ÉΪһÖÖͨÓõÄÊý¾Ý½»»»¸ñʽ,ËüµÄƽ̨ÎÞ¹ØÐÔ,ÓïÑÔÎÞ¹ØÐÔ,ϵͳÎÞ¹ØÐÔ,¸øÊý¾Ý¼¯³ÉÓë½»»¥´øÀ´Á˼«´óµÄ·½±ã¡£¶ÔÓÚXML±¾ÉíµÄÓ﷨֪ʶÓë¼¼Êõϸ½Ú,ÐèÒªÔĶÁÏà¹ØµÄ¼¼ÊõÎÄÏ×,ÕâÀïÃæ°üÀ¨µÄÄÚÈÝÓÐDOM(Document Object Model),DTD(Document Type Definition),SAX(Simple API for XML),XSD(Xml Schema Definition),XSLT(Exten ......