DOM4J操作XML

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import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

publicclass operateXML {
   /**
    * 解析XML
    * @param fileName XMl名称
    */
   publicvoid parseXml(String fileName){
      //1.构建解析器SAXReader
      SAXReader reader = new SAXReader();

      Document doc =null;//声明document转换器
      try {
          //2.将XML文件转换成document对象reader.read(filename);
          doc = reader.read(fileName);
      } catch (DocumentException e) {
          e.printStackTrace();
      }
      //3.获得根元素getRootElement()
      Element root = doc.getRootElement();

      //4.遍历元素集合root.elementIterator()
      //Iterator<Element> iter= root.elementIterator();

      for (Iterator<Element> iter =root.elementIterator();iter.hasNext();){
          Element element = iter.next();
          String fruit = element.attributeValue("fruit");//获取子元素标签
          String name = element.elementText("name");//获取name属性的值
          String color = element.elementText("color");//获取color属性的值

          //答应输出信息
          System.out.println("节点："+fruit);
          System.out.println("name:"+name);
          System.out.println("color:"+color);
          System.out.println("---------------------");
      }
   }

   /**
    * 生成XML
    * @param filenamexml文件名
    */
   publicvoid createXML(String filename){
      //1. 使用DocumentHelper.createDocument()构建一个  dom4j的document对象
      Document doc = DocumentHelper.createDocument();
      //2.从根节点开始构建节点和树形结构
      Element root = doc.addElement("fruits");

      Element fruit1=root.addElement("fruit");
      fruit1.addAttribute("fruitNo","1");//设置属性
      fruit1.addElement("name").addText("苹果");
      fruit1.addElement("color").addText("红色");

      Element fruit2=root.addElement("fruit");
      fruit2.addAttribute("fruitNo","2");//设置属性
      fruit2.addElement("name").addText("橙子");
      fruit2.addElement("color").addText("橙色");

      //3.设置格式OutputFormat
      OutputFormat format = OutputFormat.createCompactFormat();
      format.setEncoding("UTF-8");

      //4.实例化一个XMLWriter输出对象，打开输出流
      XMLWriter out= null;
      try {
          out = new XMLWriter(new FileOutputStream(filename),format);
      } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
      } catch (FileNotFoundException e) {
          e.printStackTrace();
      }
      //5. 将document对象输出到xml文件out.write(doc);
      try {
          out.write(doc);
      } catch (IOException e) {
          e.printStackTrace();
      }finally{
          //6.关闭输出流out.close();
          try {
             out.close();
          } catch (IOException e) {
             e.printStackTrace();
          }
      }

   }
   /**
    * 修改XML
    * @param filenamexml名称
    */
   publicvoid modifyXML(String filename){
      //构建解析器SAXReader
      SAXReader reader = new SAXReader();

      Document doc =null;//声明document转换器
      try {
          //2.将XML文件转换成document对象reader.read(filename);
          doc = reader.read(filename);
      } catch (DocumentException e) {
          e.printStackTrace();
      }
      //3.获得根元素getRootElement()
      Element root = doc.getRootElement();

      //4.遍历元素集合root.elementIterator()
      for(Iterator<Element> iter =root.elementIterator();iter.hasNext();){
          Element fruit = iter.next();

          //5.修改文本内容或属性值
          if(fruit.elementText("name").equals("苹果")){
             //fruit.selectSingleNode("color").setText("青色");
             //Element name =fruit.getChild("name");
             //name.setText("苹果");

             fruit.element("color").setText("青色");
             fruit.remove(fruit.attribute("fruitNo"));
          }
      }

      //6.设置格式OutputFormat
      OutputFormat format = OutputFormat.createCompactFormat();
      format.setEncoding("UTF-8");

      //7.实例化一个XMLWriter输出对象，打开输出流
      XMLWriter out = null;
      try {
          out = new XMLWriter(new FileOutputStream(filename),format);
      } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
      } catch (FileNotFoundException e) {
          e.printStackTrace();
      }

      //8. 将document对象输出到xml文件out.write(doc);
      try {
          out.write(doc);
      } catch (IOException e) {
          e.printStackTrace();
      }finally{
          //9.关闭输出流out.close();
          try {
             out.close();
          } catch (IOException e) {
             e.printStackTrace();
          }
      }
   }

   publicstaticvoid main(String[] args) {
      //实例化操作xml对象
      operateXML op = new operateXML();
      //解析XML
      op.parseXml("fruit.xml");
      //创建XML
      op.createXML("fruits.xml");
      //修改XML
      op.modifyXML("fruit.xml");
      //解析XML
      op.parseXml("fruit.xml");

   }
}