Каков наилучший способ изменить атрибут XML с помощью DOM4J

Question

Я пытаюсь изменить значение в файле XML с помощью DOM4J. Файл не слишком большой, но его много:

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<process version="5.3.013"> 
    <context> 
    <input/> 
    <output/> 
    <macros/> 
    </context> 
    <operator activated="true" class="process" compatibility="5.3.013" expanded="true" name="Process"> 
    <parameter key="logverbosity" value="init"/> 
    <parameter key="random_seed" value="2001"/> 
    <parameter key="send_mail" value="never"/> 
    <parameter key="notification_email" value=""/> 
    <parameter key="process_duration_for_mail" value="30"/> 
    <parameter key="encoding" value="SYSTEM"/> 
    <process expanded="true"> 
     <operator activated="true" class="read_csv" compatibility="5.3.013" expanded="true" height="60" name="Read CSV" width="90" x="45" y="30"> 
     <parameter key="csv_file" value="C:\Documents and Settings\Geral\workspace\AdaptDBAnalisysPlatform_Core\Results\QueryResults\P1\Results1.csv"/> 
     <parameter key="column_separators" value=","/> 
     <parameter key="trim_lines" value="false"/> 
     <parameter key="use_quotes" value="true"/> 
     <parameter key="quotes_character" value="&quot;"/> 
     <parameter key="escape_character" value="\"/> 
     <parameter key="skip_comments" value="false"/> 
     <parameter key="comment_characters" value="#"/> 
     <parameter key="parse_numbers" value="true"/> 
     <parameter key="decimal_character" value="."/> 
     <parameter key="grouped_digits" value="false"/> 
     <parameter key="grouping_character" value=","/> 
     <parameter key="date_format" value=""/> 
     <parameter key="first_row_as_names" value="false"/> 
     <list key="annotations"> 
      <parameter key="0" value="Name"/> 
     </list> 
     <parameter key="time_zone" value="SYSTEM"/> 
     <parameter key="locale" value="English (United States)"/> 
     <parameter key="encoding" value="windows-1252"/> 
     <list key="data_set_meta_data_information"> 
      <parameter key="0" value="idUSER.true.integer.id"/> 
      <parameter key="1" value="GENERO.true.integer.attribute"/> 
      <parameter key="2" value="IDADE.true.binominal.attribute"/> 
      <parameter key="3" value="PALAVRACHAVE.true.polynominal.label"/> 
     </list> 
     <parameter key="read_not_matching_values_as_missings" value="true"/> 
     <parameter key="datamanagement" value="double_array"/> 
     </operator> 
     <operator activated="true" class="set_role" compatibility="5.3.013" expanded="true" height="76" name="Set Role" width="90" x="45" y="165"> 
     <parameter key="attribute_name" value="PALAVRACHAVE"/> 
     <parameter key="target_role" value="label"/> 
     <list key="set_additional_roles"> 
      <parameter key="idUSER" value="id"/> 
     </list> 
     </operator> 
     <operator activated="true" class="k_medoids" compatibility="5.3.013" expanded="true" height="76" name="Clustering (2)" width="90" x="246" y="30"> 
     <parameter key="add_cluster_attribute" value="true"/> 
     <parameter key="add_as_label" value="true"/> 
     <parameter key="remove_unlabeled" value="false"/> 
     <parameter key="k" value="4"/> 
     <parameter key="max_runs" value="100"/> 
     <parameter key="max_optimization_steps" value="100"/> 
     <parameter key="use_local_random_seed" value="false"/> 
     <parameter key="local_random_seed" value="1992"/> 
     <parameter key="measure_types" value="MixedMeasures"/> 
     <parameter key="mixed_measure" value="MixedEuclideanDistance"/> 
     <parameter key="nominal_measure" value="DiceSimilarity"/> 
     <parameter key="numerical_measure" value="EuclideanDistance"/> 
     <parameter key="divergence" value="GeneralizedIDivergence"/> 
     <parameter key="kernel_type" value="radial"/> 
     <parameter key="kernel_gamma" value="1.0"/> 
     <parameter key="kernel_sigma1" value="1.0"/> 
     <parameter key="kernel_sigma2" value="0.0"/> 
     <parameter key="kernel_sigma3" value="2.0"/> 
     <parameter key="kernel_degree" value="3.0"/> 
     <parameter key="kernel_shift" value="1.0"/> 
     <parameter key="kernel_a" value="1.0"/> 
     <parameter key="kernel_b" value="0.0"/> 
     </operator> 
     <operator activated="true" class="map_clustering_on_labels" compatibility="5.3.013" expanded="true" height="76" name="Map Clustering on Labels" width="90" x="313" y="165"/> 
     <connect from_op="Read CSV" from_port="output" to_op="Set Role" to_port="example set input"/> 
     <connect from_op="Set Role" from_port="example set output" to_op="Clustering (2)" to_port="example set"/> 
     <connect from_op="Clustering (2)" from_port="cluster model" to_op="Map Clustering on Labels" to_port="cluster model"/> 
     <connect from_op="Clustering (2)" from_port="clustered set" to_op="Map Clustering on Labels" to_port="example set"/> 
     <connect from_op="Map Clustering on Labels" from_port="example set" to_port="result 1"/> 
     <portSpacing port="source_input 1" spacing="0"/> 
     <portSpacing port="sink_result 1" spacing="0"/> 
     <portSpacing port="sink_result 2" spacing="0"/> 
    </process> 
    </operator> 
</process> 

Идея проста. Я хочу изменить значение строки <parameter key="k" value="4"/> (оператора k_medoids) для другого значения. Таким образом, я Worte следующего кода http://www.ibm.com/developerworks/xml/library/x-dom4j/index.html?ca=drs:

PARAMETERS_Key = document.selectNodes("//operator/parameter/@key"); //find parameter K 
      PARAMETERS_Key_IT = PARAMETERS_Key.iterator(); 

      while(PARAMETERS_Key_IT.hasNext()) 
      { 
       PARAMETERS_Value = document.selectNodes("//operator/parameter/@value"); //Value of the parameter 
       PARAMETERS_Value_IT = PARAMETERS_Value.iterator(); 

       Attribute KEY=(Attribute)PARAMETERS_Key_IT.next(); 
       Attribute VALUE=(Attribute)PARAMETERS_Value_IT.next(); 

       if(KEY.getValue().equals("k")) //if Parameter key is k, then change its value for 4 
        VALUE.setValue("41000"); 
      } 

      XMLWriter output = new XMLWriter(new FileWriter(new File("c:/catalog/catalog-modified.xml"))); 
      output.write(document); 
      output.close(); 

Видимо, XPaths являются правильными: подтвержденным через http://www.xpathtester.com/test, однако я получаю следующее исключение, которые показывают, что, по-видимому, Xpath не в порядке:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jaxen/JaxenException 
    at org.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230) 
    at org.dom4j.tree.AbstractNode.createXPath(AbstractNode.java:207) 
    at org.dom4j.tree.AbstractNode.selectNodes(AbstractNode.java:164) 
    at general.XMLParser.modifyDocument(XMLParser.java:38) 
    at dataMinning.processes.P1.<init>(P1.java:15) 
    at dataMining.ModelCaller.Model1(ModelCaller.java:22) 
    at dataMining.ModelCaller.work(ModelCaller.java:16) 
    at general.Begin.main(Begin.java:22) 
Caused by: java.lang.ClassNotFoundException: org.jaxen.JaxenException 
    at java.net.URLClassLoader$1.run(Unknown Source) 
    at java.net.URLClassLoader$1.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(Unknown Source) 
    at java.lang.ClassLoader.loadClass(Unknown Source) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 
    at java.lang.ClassLoader.loadClass(Unknown Source) 
    ... 8 more 

Я не вижу никаких проблем. Что мне не хватает?

Спасибо заранее

Answer 1

Этот вопрос намного проще решить, используя W3C DOM, как keshlam предложил. Вот мое решение обновить значение 4 на другое значение в строке <parameter key="k" value="4"/>

import java.io.ByteArrayInputStream; 
import java.io.File; 
import java.io.IOException; 

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 

import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.NamedNodeMap; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.xml.sax.SAXException;*/ 


import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 



import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.xpath.XPath; 
import javax.xml.xpath.XPathConstants; 
import javax.xml.xpath.XPathExpressionException; 
import javax.xml.xpath.XPathFactory; 



import org.w3c.dom.Document; 
import org.w3c.dom.NamedNodeMap; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.xml.sax.SAXException; 

import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerConfigurationException; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 

import org.w3c.dom.Element; 




public class XMLParser { 


    public void modifyDocument(String inputXml) 
    { 


       try { 
        FileInputStream file = new FileInputStream(new File(inputXml)); 

        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance(); 

        DocumentBuilder builder = builderFactory.newDocumentBuilder(); 

        Document xmlDocument = builder.parse(file); 

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

        String expression = "//operator[@class='k_medoids']/parameter[@key='k']"; 
        String email = xPath.compile(expression).evaluate(xmlDocument); 

        NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET); 

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

         NamedNodeMap attr = nodeList.item(i).getAttributes(); 
         Node nodeAttr = attr.getNamedItem("value"); 
         nodeAttr.setTextContent("VALUE TO CHANGE"); 
        } 

        // write the content into xml file 
         TransformerFactory transformerFactory = TransformerFactory.newInstance(); 
         Transformer transformer = transformerFactory.newTransformer(); 
         DOMSource source = new DOMSource(xmlDocument); 
         StreamResult result = new StreamResult(new File(inputXml)); 
         transformer.transform(source, result);    

       } catch (FileNotFoundException e) { 
        e.printStackTrace(); 
       } catch (SAXException e) { 
        e.printStackTrace(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } catch (ParserConfigurationException e) { 
        e.printStackTrace(); 
       } catch (XPathExpressionException e) { 
        e.printStackTrace(); 
       } catch (TransformerConfigurationException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (TransformerException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       }  
      } 

} 

Я должен сказать, что XPath является очень полезным.

С наилучшими пожеланиями