使用Dom4j修改XML文件

代码如下：

需要使用的jar包除了dom4j的jar包之外，还需要jar包：jaxen-1.1-beta-6.jar

package xml;

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 Dom4jModifyXml {
    public void modifyDocument(File inputXml) {
        try {
            //使用 SAXReader 解析 XML 文档
            SAXReader saxReader = new SAXReader();
            Document document = saxReader.read(inputXml);
            
            //使用 XPath 表达式从 article 元素中获得 level 节点列表。
            //如果 level 属性值是Intermediate则改为Introductory。
            //定位节点需要使用jar包：jaxen-1.1-beta-6.jar
            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");
            }

            //修改日期
            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");
            }
            
            //获取 article 元素列表，从 article 元素中的 title 元素得到一个迭代器，并修改 title 元素的文本。
            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");
                }
            }
            
            //修改作者的姓
            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");
                }
            }
            
            //修改作者的名字
            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");
                }
            }
            
            //将修改后的文档流写入新的xml文件中
            XMLWriter output = new XMLWriter(new FileWriter(new File("E:/xml/catalog-modify.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) {
        Dom4jModifyXml dom4jModifyXml = new Dom4jModifyXml();
        dom4jModifyXml.modifyDocument(new File("E:/xml/catalog.xml"));
    }
}

原来的catalog.xml文件:

<?xml version="1.0" encoding="UTF-8"?> 
<catalog> 
<!--An XML Catalog--> 
<?target instruction?>
<journal title="XML Zone" publisher="IBM developerWorks"> 
  <article level="Intermediate" date="December-2001">
    <title>Java configuration with XML Schema</title> 
    <author> 
      <firstname>Marcello</firstname> 
      <lastname>Vitaletti</lastname> 
    </author>
  </article>
 </journal> 
</catalog>

修改后的catalog-modify.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<catalog> 
<!--An XML Catalog--> 
<?target instruction?>
<journal title="XML Zone" publisher="IBM developerWorks"> 
  <article level="Introductory" date="October-2002">
    <title>Create flexible and extensible XML schema</title> 
    <author> 
      <firstname>Ayesha</firstname> 
      <lastname>Malik</lastname> 
    </author>
  </article>
 </journal> 
</catalog>