DOM4J

XML文件如下：

 

<books>
  <!--This is a test for dom4j, holen, 2004.9.11-->
  <book show="no">
       <title>Dom4j Tutorials</title>
  </book>
  <book show="no">
       <title>Lucene Studing</title>
  </book>
  <book show="no">
       <title>Lucene in Action</title>
  </book>
  <owner>O'Reilly</owner>
</books>

 

对XML操作的代码如下：

package com.holen.dom4j;
 
import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;
 
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
 
/**
 * @author Holen Chen
 */
public class Dom4jDemo {
    
    public Dom4jDemo() {
    }
    
    /**
     * 建立一个XML文档,文档名由输入参数决定
     * @param filename 需建立的文件名
     * @return 返回操作结果, 0表失败, 1表成功
     */
    public int createXMLFile(String filename){
       /** 返回操作结果, 0表失败, 1表成功 */
       int returnValue = 0;
       /** 建立document对象 */
        Document document = DocumentHelper.createDocument();
       /** 建立XML文档的根books */
        Element booksElement = document.addElement("books");
       /** 加入一行注释 */
        booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");
       /** 加入第一个book节点 */
        Element bookElement = booksElement.addElement("book");
       /** 加入show参数内容 */
        bookElement.addAttribute("show","yes");
       /** 加入title节点 */
        Element titleElement = bookElement.addElement("title");
       /** 为title设置内容 */
        titleElement.setText("Dom4j Tutorials");
       
       /** 类似的完成后两个book */
        bookElement = booksElement.addElement("book");
        bookElement.addAttribute("show","yes");
        titleElement = bookElement.addElement("title");
        titleElement.setText("Lucene Studing");
        bookElement = booksElement.addElement("book");
        bookElement.addAttribute("show","no");
        titleElement = bookElement.addElement("title");
        titleElement.setText("Lucene in Action");
       
       /** 加入owner节点 */
        Element ownerElement = booksElement.addElement("owner");
        ownerElement.setText("O'Reilly");
       
       try{
           /** 将document中的内容写入文件中 */
           XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
           writer.write(document);
           writer.close();
           /** 执行成功,需返回1 */
           returnValue = 1;
        }catch(Exception ex){
           ex.printStackTrace();
       }
               
        return returnValue;
    }
    
    /**
     * 修改XML文件中内容,并另存为一个新文件
     * 重点掌握dom4j中如何添加节点,修改节点,删除节点
     * @param filename 修改对象文件
     * @param newfilename 修改后另存为该文件
     * @return 返回操作结果, 0表失败, 1表成功
     */
    public int ModiXMLFile(String filename,String newfilename){
       int returnValue = 0;
       try{
           SAXReader saxReader = new SAXReader();    
           Document document = saxReader.read(new File(filename));
           /** 修改内容之一: 如果book节点中show参数的内容为yes,则修改成no */
           /** 先用xpath查找对象 */
           List list = document.selectNodes("/books/book/@show" );    
           Iterator iter = list.iterator();
           while(iter.hasNext()){
               Attribute attribute = (Attribute)iter.next();
               if(attribute.getValue().equals("yes")){
                   attribute.setValue("no");
               }   
           }
           
           /**
            * 修改内容之二: 把owner项内容改为Tshinghua
            * 并在owner节点中加入date节点,date节点的内容为2004-09-11,还为date节点添加一个参数type
            */
           list = document.selectNodes("/books/owner" );
           iter = list.iterator();
           if(iter.hasNext()){
               Element ownerElement = (Element)iter.next();
               ownerElement.setText("Tshinghua");
               Element dateElement = ownerElement.addElement("date");
               dateElement.setText("2004-09-11");
               dateElement.addAttribute("type","Gregorian calendar");
           }
           
           /** 修改内容之三: 若title内容为Dom4j Tutorials,则删除该节点 */
           list = document.selectNodes("/books/book");
           iter = list.iterator();
           while(iter.hasNext()){
               Element bookElement = (Element)iter.next();
               Iterator iterator = bookElement.elementIterator("title");
               while(iterator.hasNext()){
                   Element titleElement=(Element)iterator.next();
                   if(titleElement.getText().equals("Dom4j Tutorials")){
                      bookElement.remove(titleElement);
                  }
               }
           }           
           
           try{
               /** 将document中的内容写入文件中 */
               XMLWriter writer = new XMLWriter(new FileWriter(new File(newfilename)));
               writer.write(document);
               writer.close();
               /** 执行成功,需返回1 */
               returnValue = 1;
           }catch(Exception ex){
               ex.printStackTrace();
           }
           
        }catch(Exception ex){
           ex.printStackTrace();
       }
        return returnValue;
    }
    
    /**
     * 格式化XML文档,并解决中文问题
     * @param filename
     * @return
     */
    public int formatXMLFile(String filename){
       int returnValue = 0;
       try{
           SAXReader saxReader = new SAXReader();    
           Document document = saxReader.read(new File(filename));
           XMLWriter output = null;
           /** 格式化输出,类型IE浏览一样 */
           OutputFormat format = OutputFormat.createPrettyPrint();
           /** 指定XML字符集编码 */
           format.setEncoding("GBK");
           output = new XMLWriter(new FileWriter(new File(filename)),format);
           output.write(document);
           output.close();        
           /** 执行成功,需返回1 */
           returnValue = 1;       
        }catch(Exception ex){
           ex.printStackTrace();
       }
        return returnValue;
    }
 
    public static void main(String[] args) {
        Dom4jDemo temp = new Dom4jDemo();
        System.out.println(temp.createXMLFile("d://holen.xml"));
        System.out.println(temp.ModiXMLFile("d://holen.xml","d://holen2.xml"));
        System.out.println(temp.formatXMLFile("d://holen2.xml"));
    }
}