JAVA 创建与解析XML

JAVA 创建与解析XML
package xmllab;

import java.io.File;
import java.io.FileWriter;
import java.io.StringReader;
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();//<?xml version="1.0" encoding="UTF-8"?>
        /** 建立XML文档的根books */
        Element booksElement = document.addElement("books");//<books></books>
        /** 加入一行注释 */
        booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");//<books><!--This is a test for dom4j, holen, 2004.9.11--></books>
        /** 加入第一个book节点 */
        Element bookElement = booksElement.addElement("book");//<books><!--This is a test for dom4j, holen, 2004.9.11--><book></book></books>
        /** 加入show属性内容 */
        bookElement.addAttribute("show","yes");//<books><!--This is a test for dom4j, holen, 2004.9.11--><book show="yes"></book></books>
        /** 加入title节点 */
        Element titleElement = bookElement.addElement("title");//<books><!--This is a test for dom4j, holen, 2004.9.11--><book show="yes"><title></title></book></books>
        /** 为title设置内容 */
        titleElement.setText("Dom4j Tutorials");//<books><!--This is a test for dom4j, holen, 2004.9.11--><book show="yes"><title>Dom4j Tutorials</title></book></books>
        /** 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("测试");
        /** 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 */
         /** 格式化输出 */

            OutputFormat format = OutputFormat.createPrettyPrint();

            /** 指定XML编码 */

            format.setEncoding("GBK");
            XMLWriter 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;
     }

     /**
       * 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));
             //Document document=saxReader.read(new StringReader(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("2007-09-06");
                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 */

               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;

        }



    public static void main(String[] args) {

       Dom4jDemo temp = new Dom4jDemo();
       temp.createXMLFile("e://myxml.xml");
       //temp.formatXMLFile("e://myxml.xml");
       //temp.ModiXMLFile("e://myxml.xml", "e://myxml2.xml");

       //System.out.println(temp.createXMLFile("d://testxml.xml"));
      
       //System.out.println(temp.ModiXMLFile("d://testxml.xml","d://testxml2.xml"));
//       try{
         //System.out.println(temp.formatXMLFile("d://testxml2.xml"));
//        // System.out.println(temp.formatXMLFile("E:\\test.xml"));
//       }
//       catch(Exception e)
//       {
//        // e.printStackTrace();
//        System.out.print("error!");
//
//    }

    }
}