请问哪位能给出Xalan应用XPath的代码例子？

[Patrick_DK]

小弟正在做一个Application，有一部分的功能是操作几个用来存放数据信息的XML文档，包括，检索，增加，删除等等吧。如果纯粹用Java代码来遍历，效率当然太低了。
于是看了看Xalan的介绍，考虑使用XPath。不过没有找到相关的代码例子。不知道哪位高手能提供一个简短的Xalan应用XPath的代码例子给我瞧瞧。
另外，我想问问，是不是能够用JDOM配合XPath呢，还是一定要用DOM的？

[X25]

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// This file uses 4 space indents, no tabs.

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Properties;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xpath.XPathAPI;
import org.apache.xml.utils.TreeWalker;
import org.apache.xml.utils.DOMBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;

// Imported JAVA API for XML Parsing 1.0 classes
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

// Imported Serializer classes
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.*;

/**
* Very basic utility for applying an XPath epxression to an xml file and printing information
/ about the execution of the XPath object and the nodes it finds.
* Takes 2 arguments:
* (1) an xml filename
* (2) an XPath expression to apply to the file
* Examples:
* java ApplyXPath foo.xml /
* java ApplyXPath foo.xml /doc/name[1]/@last
* @see XPathAPI
*/
public class ApplyXPath
{
protected String filename = null;
protected String xpath = null;

/** Process input args and execute the XPath. */
public void doMain(String[] args)
throws Exception
{
filename = args[0];
xpath = args[1];

if ((filename != null) && (filename.length() > 0)
&& (xpath != null) && (xpath.length() > 0))
{
// Tell that we're loading classes and parsing, so the time it
// takes to do this doesn't get confused with the time to do
// the actual query and serialization.
System.out.println("Loading classes, parsing "+filename+", and setting up serializer");

// Set up a DOM tree to query.
InputSource in = new InputSource(new FileInputStream(filename));
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
dfactory.setNamespaceAware(true);
Document doc = dfactory.newDocumentBuilder().parse(in);

// Set up an identity transformer to use as serializer.
Transformer serializer = TransformerFactory.newInstance().newTransformer();
serializer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");

// Use the simple XPath API to select a nodeIterator.
System.out.println("Querying DOM using "+xpath);
NodeIterator nl = XPathAPI.selectNodeIterator(doc, xpath);

// Serialize the found nodes to System.out.
System.out.println("<output>");

Node n;
while ((n = nl.nextNode())!= null)
{
if (isTextNode(n)) {
// DOM may have more than one node corresponding to a
// single XPath text node. Coalesce all contiguous text nodes
// at this level
StringBuffer sb = new StringBuffer(n.getNodeValue());
for (
Node nn = n.getNextSibling();
isTextNode(nn);
nn = nn.getNextSibling()
) {
sb.append(nn.getNodeValue());
}
System.out.print(sb);
}
else {
serializer.transform(new DOMSource(n), new StreamResult(System.out));
}
System.out.println();
}
System.out.println("</output>");
}
else
{
System.out.println("Bad input args: " + filename + ", " + xpath);
}
}

/** Decide if the node is text, and so must be handled specially */
static boolean isTextNode(Node n) {
if (n == null)
return false;
short nodeType = n.getNodeType();
return nodeType == Node.CDATA_SECTION_NODE || nodeType == Node.TEXT_NODE;
}

/** Main method to run from the command line. */
public static void main (String[] args)
throws Exception
{
if (args.length != 2)
{
System.out.println("java ApplyXPath filename.xml xpath\n"
+ "Reads filename.xml and applies the xpath; prints the nodelist found.");
return;
}

ApplyXPath app = new ApplyXPath();
app.doMain(args);
}

} // end of class ApplyXPath

[Patrick_DK]

to 楼上

偶想看看简单例子的原代码，不是看类库的原代码

[salute]

"有一部分的功能是操作几个用来存放数据信息的XML文档，包括，检索，增加，删除等等吧"
用JDOM吧,正好适合做这个.

"于是看了看Xalan的介绍，考虑使用XPath。不过没有找到相关的代码例子。不知道哪位高手能提供一个简短的Xalan应用XPath的代码例子给我瞧瞧。"
XALAN是格式转换用,用到了XPATH的技术.和你的需求似乎不太相符.

[Patrick_DK]

to salute：

如果用光光用JDOM的话，你如何能够快速的操作的XML文档数据呢？
比如，迅速定位到某个节点等等。如果，每次执行对XML文档的操作，都要遍历一次整个XML文档，效率启不是太低了？

难道JDOM就不能和其他支持XPath的JavaAPI联合应用吗？