java通过XPATH解析XML

package testXpath;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Map;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.NodeList;

public class TestXpathExample {
public static void main(String args[]) throws FileNotFoundException, TransformerException, XPathExpressionException{
TransformerFactory transFact = TransformerFactory.newInstance();
Transformer transFormer = transFact.newTransformer();
DOMResult dom = new DOMResult();
transFormer.transform(new StreamSource(new FileInputStream(new File("test.xml"))), dom);

XPath xpath = XPathFactory.newInstance().newXPath();

@SuppressWarnings("serial")
Map<String,String> prefix2uri = new HashMap<String,String>(){{

put("foo","http://www.baidu.com");
put("bar","http://www.google.com");

}};

@SuppressWarnings("serial")
Map<String,String> uri2prefix = new HashMap<String,String>(){{
put("http://www.baidu.com","foo");
put("http://www.google.com","bar");
}};

xpath.setNamespaceContext(new NsSolver(prefix2uri,uri2prefix));

XPathExpression expression = xpath.compile("//player");

NodeList nodeList = (NodeList)expression.evaluate(dom.getNode(),XPathConstants.NODESET);

for(int i = 0; i < nodeList.getLength(); i++){
System.out.println(nodeList.item(i).getNodeName());
}
}
}