用pull解析和生成xml简单实例

 

 

pull 解析也是事件驱动的，android中已经加入jar包,java使用时可以到官网加入jar包

//xml文件
<?xml version="1.0" encoding="UTF-8"?>
<persons>
	<person id="23">
		<name>liming</name>
		<age>30</age>
	</person>
	<person id="20">
		<name>lixiangmei</name>
		<age>25</age>
	</person>
</persons>

 

 

import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;

import android.util.Xml;

import cn.itcast.domain.Person;

public class PULLPersonService {
	/**pull生成xml文件**/
	public static void save(List<Person> persons, Writer writer) throws Throwable{
		XmlSerializer serializer = Xml.newSerializer();
		serializer.setOutput(writer);
		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();
		writer.flush();
		writer.close();
	}

/**pull解析xml文件**/
	public static List<Person> getPersons(InputStream inStream) throws Throwable{
		List<Person> persons = null;
		Person person = null;
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(inStream, "UTF-8");
		int eventType = parser.getEventType();//产生第一个事件
		while(eventType!=XmlPullParser.END_DOCUMENT){//只要不是文档结束事件
			switch (eventType) {
			case XmlPullParser.START_DOCUMENT:
				persons = new ArrayList<Person>();
				break;
	
			case XmlPullParser.START_TAG:
				String name = parser.getName();//获取解析器当前指向的元素的名称
				if("person".equals(name)){
					person = new Person();
					person.setId(new Integer(parser.getAttributeValue(0)));
				}
				if(person!=null){
					if("name".equals(name)){
						person.setName(parser.nextText());//获取解析器当前指向元素的下一个文本节点的值
					}
					if("age".equals(name)){
						person.setAge(new Short(parser.nextText()));
					}
				}
				break;
				
			case XmlPullParser.END_TAG:
				if("person".equals(parser.getName())){
					persons.add(person);
					person = null;
				}
				break;
			}
			eventType = parser.next();
		}
		return persons;
	}
}

 

与sax不同的是pull只要对先获得一个事件类型然后用switch判断只要判断Tag，并用nextText获得文本

用 parser.next();循环