使用 dom4j 解析 XML（四）

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Attribute;
import java.util.List;
import java.util.Iterator;
import org.dom4j.io.XMLWriter;
import java.io.*;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader; 
public class Dom4JParser{
 public void modifyDocument(File inputXml){
  try{
   SAXReader saxReader = new SAXReader();
   Document document = saxReader.read(inputXml);
   List list = document.selectNodes("//article/@level" );
   Iterator iter=list.iterator();
   while(iter.hasNext()){
    Attribute attribute=(Attribute)iter.next();
    if(attribute.getValue().equals("Intermediate"))
      attribute.setValue("Introductory"); 
       }
   
   list = document.selectNodes("//article/@date" );
   iter=list.iterator();
   while(iter.hasNext()){
    Attribute attribute=(Attribute)iter.next();
    if(attribute.getValue().equals("December-2001"))
      attribute.setValue("October-2002");
       }
   list = document.selectNodes("//article" );
   iter=list.iterator();
   while(iter.hasNext()){
    Element element=(Element)iter.next();
    Iterator iterator=element.elementIterator("title");
      while(iterator.hasNext()){
        Element titleElement=(Element)iterator.next();
        if(titleElement.getText().equals("Java configuration with XML
      Schema"))
        titleElement.setText("Create flexible and extensible XML schema");
                                          }
                                }
    list = document.selectNodes("//article/author" );
    iter=list.iterator();
     while(iter.hasNext()){
     Element element=(Element)iter.next();
     Iterator iterator=element.elementIterator("firstname");
     while(iterator.hasNext()){
      Element firstNameElement=(Element)iterator.next();
      if(firstNameElement.getText().equals("Marcello"))
      firstNameElement.setText("Ayesha");
                                     }
                              }
    list = document.selectNodes("//article/author" );
    iter=list.iterator();
     while(iter.hasNext()){
      Element element=(Element)iter.next();
      Iterator iterator=element.elementIterator("lastname");
     while(iterator.hasNext()){
      Element lastNameElement=(Element)iterator.next();
      if(lastNameElement.getText().equals("Vitaletti"))
      lastNameElement.setText("Malik");
                                  }
                               }
     XMLWriter output = new XMLWriter(
      new FileWriter( new File("c:/catalog/catalog-modified.xml") ));
     output.write( document );
     output.close();
   }
 
  catch(DocumentException e)
                 {
                  System.out.println(e.getMessage());
                            }
  catch(IOException e){
                       System.out.println(e.getMessage());
                    }
 }
 public static void main(String[] argv){
  Dom4JParser dom4jParser=new Dom4JParser();
  dom4jParser.modifyDocument(new File("c:/catalog/catalog.xml"));
                                        }
   }
节说明了如何使用 dom4j 中的解析器修改示例 XML 文档。这个解析器不使用 DTD 或者模式验证 XML 文档。如果 XML 文档需要验证，可以解释用 dom4j 与 JAXP SAX 解析器。