android第十二步Pull解析器解析和生成XML内容

重点关键字

InputStream xml = getClass().getClassLoader().getResourceAsStream("person.xml"); 获取包下文件

XmlPullParser parser = Xml.newPullParser(); 实例化pull
parser.setInput(xml, "UTF-8"); 设置读取位置

parser.getName()获取标签名称

parser.getAttributeValue(0)获取标签第一个属性值

parser.nextText()获取标签值

public static List<Person> getPersons(InputStream xml) throws Exception{
List<Person> persons = null;
XmlPullParser pullParser= XmlPullParserFactory.newInstance().newPullParser();
//XmlPullParser pullParser=Xml.newPullParser();
pullParser.setInput(xml, "UTF-8");//为Pull解析器设置要解析的XML数据
int event = pullParser.getEventType();
Person person = null;
while(event!=XmlPullParser.END_DOCUMENT)
{
switch(event)
{
case XmlPullParser.START_DOCUMENT:
　　persons = new ArrayList<Person>();
break;
case XmlPullParser.START_TAG:
　　if("person".equals(pullParser.getName())){
　　　　int id = new Integer(pullParser.getAttributeValue(0));
　　　　person = new Person();
　　　　person.setId(id);
　　  }
　　if("name".equals(pullParser.getName())){
　　　　String name=pullParser.nextText();
　　　　person.setName(name);
　　 }
　　if("age".equals(pullParser.getName())){
　　　　int age = new Integer(pullParser.nextText());
　　　　person.setAge(age);
　　 }
break;
case XmlPullParser.END_TAG:
　　if("person".equals(pullParser.getName())){
　　　　persons.add(person);
　　　　person = null;
　　}
break;
}
event=pullParser.next(); //指针指向下一个节点
}
//首先把XML数据读到char[]中然后开始解析，一个一个的字符往后读取，比对语法是否符合XML语法
return persons;
}
public static void save(List<Person> persons,OutputStream out) throws Exception{

XmlSerializer serializer = Xml.newSerializer();
serializer.setOutput(out,"UTF-8");
serializer.startDocument("UTF-8", true);
serializer.startTag(null, "persons");
for(Person person : persons){
serializer.startTag(null, "person");
serializer.attribute(null, "id", person.getId().toString());

serializer.startTag(null, "name");
serializer.text(person.getName());
serializer.endTag(null, "name");

serializer.startTag(null, "age");
serializer.text(person.getAge().toString());
serializer.endTag(null, "age");

serializer.endTag(null, "person");
}
serializer.endTag(null, "persons");
serializer.endDocument();
out.flush();
out.close();
}

public class Person {
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
}
private Integer id;
private String name;
private Integer age;
public Integer getId() {
　　return id;
}
public void setId(Integer id) {
　　this.id = id;
}
public String getName() {
　　return name;
}
public void setName(String name) {
　　this.name = name;
}
public Integer getAge() {
　　return age;
}
public void setAge(Integer age) {
　　this.age = age;
}
public Person(Integer id, String name, Integer age) {
　　this.id = id;
　　this.name = name;
　　this.age = age;
}
public Person(){

}

}

public class PersonServiceTest extends AndroidTestCase {
private static final String TAG= "PersonServiceTest";
public void testPersons() throws Exception{
　　InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");
　　List<Person> persons = PersonService.getPersons(xml);
　　for(Person person : persons){
　　Log.i(TAG, person.toString());
　　}
}
public void testSaveXml() throws Exception{
　　List<Person> persons = new ArrayList<Person>();
　　persons.add(new Person(1,"zhangxx",80));
　　persons.add(new Person(4,"zhlili",80));
　　persons.add(new Person(8,"xiaoxiao",5));
　　File xmlfile = new File(getContext().getFilesDir(),"zhao.xml");
　　FileOutputStream outStream = new FileOutputStream(xmlfile);
　　PersonService.save(persons, outStream);
　　}
}