用Jdom4j读和写xml

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package org.demo.dom4j;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.dom4j.Attribute;
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;
import org.jdom.output.Format;

public class DemoDom4j {

   /**
   * @param args
   * @throws IOException
   * @throws DocumentException
   */
   public static void main(String[] args) throws IOException, DocumentException {
       //userDom4jWriterXml();
       userDom4jReaderXml();
   }

   public static void userDom4jReaderXml() throws DocumentException {

       SAXReader reader=new SAXReader();
       Document document=reader.read("dom4j.xml");
       Element rootElement=document.getRootElement();
       List<Element> es=rootElement.elements();
       for (Element e : es) {
               //得到该元素上的所有属性
               List<Attribute> as=e.attributes();
               for (Attribute a : as) {
                   System.out.println(a.getName()+"="+a.getValue());
               }
               //得到该元素下的所有子节点
               List<Element> childElement=e.elements();
           for (Element child : childElement) {

               System.out.println(child.getName()+"="+child.getText());
           }
           System.out.println("=====================================");
       }

   }

   public static List<Student> initStudent(){
       List<Student> stuList=new ArrayList<Student>();
       for (int i = 1; i < 5; i++) {
           stuList.add(new Student("NO"+i, "JDom_"+i, "男", 20+i, "Jdom__"+i));
       }
       return stuList;
   }

   public static void userDom4jWriterXml() throws IOException {
       /**
       * 在Dom4j中创建所有的元素都是通过Dom4j的一个辅助类来创建DocumentHelper
       * 第一种方式来创建文档的根元素
       * //创建文档
           Document document = DocumentHelper.createDocument();
           //创建一个根元素
           Element rootElement=DocumentHelper.createElement("students");
           //将根元素添加到文档中
           document.setRootElement(rootElement);
           */

          //第二种方式来创建文档和文档的根元素
           //创建根元素
           Element rootElement=DocumentHelper.createElement("students");
           //创建文档并以并创建根元素
           Document document=DocumentHelper.createDocument(rootElement);

           List<Student> stus=initStudent();
           for (Student s : stus) {
               //创建根元素下的子节点 <student>及添加属性
               Element student=rootElement.addElement("student").addAttribute("id", s.getId());
               //创建<student>下的子元素
               student.addElement("name").addText(s.getName());
               student.addElement("sex").addText(s.getSex());
               student.addElement("age").addText(s.getAge()+"");
               student.addElement("address").addText(s.getAddress());
           }



           XMLWriter writer=new XMLWriter(
                   new FileOutputStream(new File("dom4j.xml")),
                   new OutputFormat("    ",true)
                   );
           writer.write(document);

   }



}

===========================================实体类==============================================

package org.demo.dom4j;

import java.io.Serializable;

public class Student implements Serializable {
   private String id;
   private String name;
   private String sex;
   private int age;
   private String address;
   public String getId() {
       return id;
   }
   public void setId(String id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public String getAddress() {
       return address;
   }
   public void setAddress(String address) {
       this.address = address;
   }


   public String getSex() {
       return sex;
   }
   public void setSex(String sex) {
       this.sex = sex;
   }
   public Student() {
       // TODO Auto-generated constructor stub
   }

   public Student(String id, String name,String sex, int age, String address) {
       super();
       this.id = id;
       this.name = name;
       this.sex=sex;
       this.age = age;
       this.address = address;
   }




}