Asmack開發系列之xmlPullParser

標籤：xmlpullparser   asmack   android   

XMPP是用XML來進行資料交換的，所以，我們必須對XML有瞭解。對於XML理論知識，可以去稍微的複習一下。例如，節點，實體，屬性等這些。今天，我們需要講的是xmlPullParser。XML解析庫其實有很多，而android平台下非常推崇它，當然XMPP也是，因為它的有點是不需要匯入整個xml檔案。還記得xmpp的一個特點就是能夠傳輸小片xml檔案資料。試想，如果你的xml解析庫非得完整的xml檔案，那麼這和xmpp的設計思想是相衝突的。

這裡，我給出一個使用xmlPullParser的例子，拋磚引玉。後續在Asmack中看到它的時候，不至於雲裡霧裡，似懂非懂。

一個存有學生資訊的xml檔案：

<?xml version="1.0" encoding="UTF-8"?><root>    <student id="1" group="1">        <name>張三</name>        <sex>男</sex>        <age>18</age>        <email>[email protected]</email>        <birthday>1987-06-08</birthday>        <memo>好學生</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>好學生</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>好學生</memo>    </student>    <student id="4" group="4">        <name>小張</name>        <sex>男</sex>        <age>18</age>        <email>[email protected]</email>        <birthday>1987-06-08</birthday>        <memo>好學生</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>好學生</memo>    </student></root>

xml對應的bean檔案：

package com.parsexml.entity;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;    }    }

XmlPullParser的解析代碼：

package com.parsexml;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;import com.parsexml.entity.Student;public class PullParseXml {            public List<Student> PullParseXML(){                List<Student> list=null;        Student student = null;                //構建XmlPullParserFactory        try {            XmlPullParserFactory pullParserFactory=XmlPullParserFactory.newInstance();            //擷取XmlPullParser的執行個體            XmlPullParser xmlPullParser=pullParserFactory.newPullParser();            //設定輸入資料流  xml檔案            xmlPullParser.setInput(Thread.currentThread().getContextClassLoader().getResourceAsStream("Student.xml"), "UTF-8");                        //開始            int eventType=xmlPullParser.getEventType();                        try {                while(eventType!=XmlPullParser.END_DOCUMENT){                    String nodeName=xmlPullParser.getName();                    switch (eventType) {                    //文檔開始                    case XmlPullParser.START_DOCUMENT:                        list=new ArrayList<Student>();                        break;                    //開始節點                    case XmlPullParser.START_TAG:                        //判斷如果其實節點為student                        if("student".equals(nodeName)){                            //執行個體化student對象                            student=new Student();                            //設定Id屬性                            student.setId(Integer.parseInt(xmlPullParser.getAttributeValue(0)));                            //設定Group屬性                            student.setGroup(Integer.parseInt(xmlPullParser.getAttributeValue(1)));                        }else if("name".equals(nodeName)){                            //設定name                            student.setName(xmlPullParser.nextText());                        }else if("sex".equals(nodeName)){                            //設定sex                            student.setSex(xmlPullParser.nextText());                        }else if("age".equals(nodeName)){                            //設定age                            student.setAge(Integer.parseInt(xmlPullParser.nextText()));                        }else if("email".equals(nodeName)){                            //設定email                            student.setEmail(xmlPullParser.nextText());                        }else if("birthday".equals(nodeName)){                            //設定birthday                            student.setBirthday(xmlPullParser.nextText());                        }else if("memo".equals(nodeName)){                            //設定memo屬性                            student.setMemo(xmlPullParser.nextText());                        }                        break;                    //結束節點                    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());        }    }    }

好，xmpPullParse的樣本就到此，這足夠在Asmack代碼裡面混了。
參考及轉載：

http://www.blogjava.net/sxyx2008/archive/2010/08/04/327885.html

Asmack開發系列之xmlPullParser