XML解析之PULL

在Android中极力推荐的xmlpull方式解析xml。

为什么 STAX 解析方式 效率 好于 SAX ？

1、SAX 无选择性的，所有事件都会处理 解析方式，Stax 由用户控制需要处理事件类型

2、在使用Stax进行数据解析时，随时终止解析

        环境：        

    xmlpull_1_1_3_4c.jar

http://www.xmlpull.org/    xmlpull

XML文件:

<?xml version="1.0" encoding="UTF-8"?>

<root>

    <student id="1" group="1">

        <name>张三</name>

        <sex>男</sex>

        <age>18</age>

        <email>[email protected]</email>

        <birthday>1987-06-08</birthday>

        <memo>好学生</memo>

    </student>

    <student id="2" group="2">

        <name>李四</name>

        <sex>女</sex>

        <age>18</age>

        <email>[email protected]</email>

        <birthday>1987-06-08</birthday>

        <memo>好学生</memo>

    </student>

    <student id="3" group="3">

        <name>小王</name>

        <sex>男</sex>

        <age>18</age>

        <email>[email protected]</email>

        <birthday>1987-06-08</birthday>

        <memo>好学生</memo>

    </student>

    <student id="4" group="4">

        <name>小张</name>

        <sex>男</sex>

        <age>18</age>

        <email>[email protected]</email>

        <birthday>1987-06-08</birthday>

        <memo>好学生</memo>

    </student>

    <student id="5" group="5">

        <name>小明</name>

        <sex>男</sex>

        <age>18</age>

        <email>[email protected]</email>

        <birthday>1987-06-08</birthday>

        <memo>好学生</memo>

    </student>

</root>

XML对应的实体文件:

public class Student {

    

    private int id;

    private int group;

    private String name;

    private String sex;

    private int age;

    private String email;

    private String memo;

    private String birthday;

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public int getGroup() {

        return group;

    }

    public void setGroup(int group) {

        this.group = group;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getMemo() {

        return memo;

    }

    public void setMemo(String memo) {

        this.memo = memo;

    }

    public String getBirthday() {

        return birthday;

    }

    public void setBirthday(String birthday) {

        this.birthday = birthday;

    }

    

}

Pull解析代码

public class PullParseXml {

    

    

    public List<Student> PullParseXML(){

        

        List<Student> list=null;

        Student student = null;

        

        //构建XmlPullParserFactory

        try {

            XmlPullParserFactory pullParserFactory=XmlPullParserFactory.newInstance();

            //获取XmlPullParser的实例

            XmlPullParser xmlPullParser=pullParserFactory.newPullParser();

            //设置输入流  xml文件

            xmlPullParser.setInput(Thread.currentThread().getContextClassLoader().getResourceAsStream("Student.xml"), "UTF-8");

            

            //开始

            int eventType=xmlPullParser.getEventType();

            

            try {

                while(eventType!=XmlPullParser.END_DOCUMENT){

                    String nodeName=xmlPullParser.getName();

                    switch (eventType) {

                    //文档开始

                    case XmlPullParser.START_DOCUMENT:

                        list=new ArrayList<Student>();

                        break;

                    //开始节点

                    case XmlPullParser.START_TAG:

                        //判断如果其实节点为student

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

                            //实例化student对象

                            student=new Student();

                            //设置Id属性

                            student.setId(Integer.parseInt(xmlPullParser.getAttributeValue(0)));

                            //设置Group属性

                            student.setGroup(Integer.parseInt(xmlPullParser.getAttributeValue(1)));

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

                            //设置name

                            student.setName(xmlPullParser.nextText());

                        }else if("sex".equals(nodeName)){

                            //设置sex

                            student.setSex(xmlPullParser.nextText());

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

                            //设置age

                            student.setAge(Integer.parseInt(xmlPullParser.nextText()));

                        }else if("email".equals(nodeName)){

                            //设置email

                            student.setEmail(xmlPullParser.nextText());

                        }else if("birthday".equals(nodeName)){

                            //设置birthday

                            student.setBirthday(xmlPullParser.nextText());

                        }else if("memo".equals(nodeName)){

                            //设置memo属性

                            student.setMemo(xmlPullParser.nextText());

                        }

                        break;

                    //结束节点

                    case XmlPullParser.END_TAG:

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

                            list.add(student);

                            student=null;

                        }

                        break;

                    default:

                        break;

                    }

                    eventType=xmlPullParser.next();

                }

            } catch (NumberFormatException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }

        } catch (XmlPullParserException e) {

            e.printStackTrace();

        }



        return list;

    }

    

    public static void main(String[] args) {

        List<Student> list=new PullParseXml().PullParseXML();

        for(Student student:list){

            System.out.println("id:"+student.getId()+"\tgroup:"+student.getGroup()+"\tname:"+student.getName()+"\tsex:"+student.getSex()+"\tage:"+student.getAge()+"\temail:"+student.getEmail()+"\tbirthday:"+student.getBirthday()+"\tmemo:"+student.getMemo());

        }

    }

    

}

Event_Type事件返回的事件代码：

public static final java.lang.String NO_NAMESPACE = "";

  

  public static final int START_DOCUMENT = 0;

  

  public static final int END_DOCUMENT = 1;

  

  public static final int START_TAG = 2;

  

  public static final int END_TAG = 3;

  

  public static final int TEXT = 4;

  

  public static final int CDSECT = 5;

  

  public static final int ENTITY_REF = 6;

  

  public static final int IGNORABLE_WHITESPACE = 7;

  

  public static final int PROCESSING_INSTRUCTION = 8;

  

  public static final int COMMENT = 9;

  

  public static final int DOCDECL = 10;

对XML数据通过PULL解析器进行CURD示意图：