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