在jdom和jaxen时候xpath的问题？

Question

jdom中目前只有XPath的interface，没有XPath的implementation
apache的xalan-j中有XPath的implementation，但你需要由jdom转向以sun的JAXP为基础的apache xerces-j和xalan-j

Answer 1

jdom9支持xpath,或许是你的版本问题
下面这段程序可以运行
import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;
import org.jdom.xpath.*;
import org.saxpath.SAXPathException;public class XPathReader {  public static void main(String[] args) throws IOException, JDOMException
{
       
        String filename = "input/customers.xml";
        PrintStream out = System.out;        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(new File(filename));     
         XPath customers = XPath.newInstance("//Customers");
         List customer = customers.selectNodes(doc);
         Iterator i = customer.iterator();
         while (i.hasNext()) {
             Element servlet = (Element) i.next();
             out.println("\t" + customer.getAttributeValue("CustomerID"));     //output attribute
             out.println(customer.getAttributeValue("CompanyName"));           
         }        
    }
}