holen.xml

<?xml version="1.0" encoding="UTF-8"?>

<books>

       <!--This is a test for dom4j, holen, 2004.9.11-->

       <book show="yes">

              <title>Dom4j Tutorials</title>

       </book>

       <book show="yes">

              <title>Lucene Studing</title>

       </book>

       <book show="no">

              <title>Lucene in Action</title>

       </book>

       <owner>O'Reilly</owner>

</books>

    /**

      * 建立一个 XML 文档 , 文档名由输入属性决定

      * @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 属性内容 */

       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;

    }

<?xml version="1.0" encoding="UTF-8"?>

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

    /**

      * 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 属性的内容为 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 节点添加一个属性 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 writer = null ;

           /** 格式化输出 , 类型 IE 浏览一样 */

           OutputFormat format = OutputFormat.createPrettyPrint();

           /** 指定 XML 编码 */

           format.setEncoding( "GBK" );

           writer= new XMLWriter( new FileWriter( new File(filename)),format);

           writer.write(document);

           writer.close();      

           /** 执行成功 , 需返回 1 */

           returnValue = 1;     

       } catch (Exception ex){

           ex.printStackTrace();

       }

       return returnValue;

    }

Dom4jDemo.java

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() {

    }

    public int createXMLFile(String filename){ …}

    public int ModiXMLFile(String filename,String newfilename){ …}

    public int formatXMLFile(String filename){ …}

    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" ));

    }

}