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Asmack开发系列之xmlPullParser
XMPP是用XML来进行数据交换的，所以，我们必须对XML有了解。对于XML理论知识，可以去稍微的复习一下。例如，节点，实体，属性等这些。今天，我们需要讲的是xmlPullParser。XML解析库其实有很多，而android平台下非常推崇它，当然XMPP也是，因为它的有点是不需要导入整个xml文件。还记得xmpp的一个特点就是能够传输小片xml文件数据。试想，如果你的xml解析库非得完整的xml文件，那么这和xmpp的设计思想是相冲突的。
这里，我给出一个使用xmlPullParser的例子，抛砖引玉。后续在Asmack中看到它的时候，不至于云里雾里，似懂非懂。
一个存有学生信息的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>zhangsan@163.com</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>lisi@163.com</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>xiaowang@163.com</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>xiaozhang@163.com</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>xiaoming@163.com</email>
<birthday>1987-06-08</birthday>
<memo>好学生</memo>
</student>
</root>xml对应的bean文件：
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的解析代码：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;
//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());
}
}
}好，xmpPullParse的示例就到此，这足够在Asmack代码里面混了。参考及转载：
http://www.blogjava.net/sxyx2008/archive/2010/08/04/327885.html
Asmack开发系列之xmlPullParser
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