import java.io.FileInputStream;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import org.xmlpull.v1.XmlPullParser;

 import org.xmlpull.v1.XmlPullParserException;

 import org.xmlpull.v1.XmlPullParserFactory;

 public class ReadXmlTest {

     /**

      *   pull解析器:反序列化     读取xml文件来获取一个对象的数据

      * @param args

      * @throws XmlPullParserException

      * @throws IOException

      */

     public static void main(String[] args) throws XmlPullParserException, IOException {

         //1.导包

         //2.获取解析器工厂

         XmlPullParserFactory factory = XmlPullParserFactory.newInstance();

         //3.根据工厂获取解析器对象

         XmlPullParser parser = factory.newPullParser();

         //4.设置输入流

         parser.setInput(new FileInputStream("src/student.xml"),"utf-8");

         //5.解析

         List<Student> list = null;

         Student stu = null;

         //获取对应时间的类型

         int type = parser.getEventType();

         while(type != XmlPullParser.END_DOCUMENT){

             //获取标签名称

             String tagname = parser.getName();

             switch(type){

             case XmlPullParser.START_TAG:

                 //判断标签名称

                 if("students".equals(tagname)){

                     //创建集合

                     list = new ArrayList<Student>();

                 }else if("student".equals(tagname)){

                     //创建对象

                     stu = new Student();

                     //获取ID属性值

                     String id = parser.getAttributeValue(0);

                     //赋值

                     stu.setId(id);

                 }else if("name".equals(tagname)){

                     //获取标签体的文本

                     String name = parser.nextText();

                     //赋值

                     stu.setName(name);

                 }else if("age".equals(tagname)){

                     //获取标签体的文本

                     String age = parser.nextText();

                     //赋值

                     stu.setAge(Integer.parseInt(age));

             }

                 break;

             case XmlPullParser.END_TAG:

                 if("student".equals(tagname)){

                     //将对象添加到集合中

                     list.add(stu);

                     stu = null;

                 }

                 break;

             default:

                 break;

             }

         //向下走一步

         parser.next();

         //重新赋值

         type = parser.getEventType();

         }

         //6.输出

         System.out.println(list);

     }

 }

 import java.io.FileOutputStream;

 import java.io.IOException;

 import org.xmlpull.v1.XmlPullParserException;

 import org.xmlpull.v1.XmlPullParserFactory;

 import org.xmlpull.v1.XmlSerializer;

 public class WriteXmlTest {

     /**pull解析器:序列化   将一个对象的数据  写入到xml文件中

      * @param args

      * @throws XmlPullParserException

      * @throws IOException

      */

     public static void main(String[] args) throws XmlPullParserException, IOException {

         Student stu = new Student("s_001", "小飞飞", 23);

         //1.导包

         //2.获取解析器工厂

         XmlPullParserFactory factory = XmlPullParserFactory.newInstance();

         //3.根据工厂获取解析器对象

         XmlSerializer serializer = factory.newSerializer();

         //4.设置输出流

         serializer.setOutput(new FileOutputStream("src/sss.xml"),"utf-8");

         //5.写入

         //5.1写文档声明  参数1：encoding属性值，参数2：standalone属性值

         serializer.startDocument("utf-8", true);

         //5.2写入开始跟标签

         serializer.startTag(null, "students");

         for(int i=0; i <5; i++){

             //5.3写入student标签

             serializer.startTag(null, "student");

             serializer.attribute(null, "id", stu.getId());

             serializer.startTag(null, "name");

             serializer.text(stu.getName());

             serializer.endTag(null, "name");

             serializer.startTag(null, "age");

             serializer.text(String.valueOf(stu.getAge()));

             serializer.endTag(null, "age");

             serializer.endTag(null, "student");

         }

         //5.4写入结束标签

         serializer.endTag(null, "students");

         //5.5写入结束文档

         serializer.endDocument();

         //反应结果

         System.out.println("写入完成,请去查看!");

     }

 }

 public class Student {

     private String id;

     private String name;

     private int age;

     public Student() {

         super();

     }

     public Student(String id, String name, int age) {

         super();

         this.id = id;

         this.name = name;

         this.age = age;

     }

     /**

      * @return the id

      */

     public String getId() {

         return id;

     }

     /**

      * @param id the id to set

      */

     public void setId(String id) {

         this.id = id;

     }

     /**

      * @return the name

      */

     public String getName() {

         return name;

     }

     /**

      * @param name the name to set

      */

     public void setName(String name) {

         this.name = name;

     }

     /**

      * @return the age

      */

     public int getAge() {

         return age;

     }

     /**

      * @param age the age to set

      */

     public void setAge(int age) {

         this.age = age;

     }

     /* (non-Javadoc)

      * @see java.lang.Object#toString()

      */

     @Override

     public String toString() {

         return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";

     }

 }

 <?xml version='1.0' encoding='utf-8' ?>

 <students>

     <student id='s001'>

         <name>zhangsan</name>

         <age>23</age>

     </student>

     <student id="s002">

         <name>lisi</name>

         <age>24</age>

     </student>

     <student id="s003">

         <name>王五</name>

         <age>25</age>

     </student>

 </students>