pull解析器: 反序列化与序列化

　　pull解析器:反序列化　　读取xml文件来获取一个对象的数据

 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);
     }
 }

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　　pull解析器:序列化　　  将一个对象的数据  写入到xml文件中

 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!");
     }
 }

　　Student类

 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 + "]";
     }

 }

　　student.xml

 <?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>

导入的包名称(pull解析器jar包):

　　kxml2-2.3.0.jar

　　xmlpull_1_1_3_4c.jar