Pull解析Xml

在android中,解析Xml文件方式大概有三种Dom、SAX和Pull(推荐使用),个人也感觉pull方式比较简单,好用...所以前两种就pass掉..

这里就简单的写下解析xml和生成xml的两个方法：

解析Xml

public static List<Person> getPersons(InputStream in) throws Exception{
		List<Person> persons = null;
		Person person = null;
		//构造pullParser的对象
		XmlPullParser pullParser = Xml.newPullParser();
		//设置要解析的xml的数据
		pullParser.setInput(in,"UTF-8");
		int event = pullParser.getEventType();
		//一直读取到xml结尾的标志
		while(event != XmlPullParser.END_DOCUMENT){
			switch (event) {
			//初始化list
			case XmlPullParser.START_DOCUMENT:
				persons = new ArrayList<Person>();
				break;
				//遇到person节点初始化一个person对象并赋值
			case XmlPullParser.START_TAG:
				if("person".equals(pullParser.getName())){
					int id = Integer.parseInt(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 = Integer.parseInt(pullParser.nextText());
					person.setAge(age);
				}
				break;
				//读取到person完毕的节点向list中添加person对象并重新将person设为null
			case XmlPullParser.END_TAG:
				if("person".equals(pullParser.getName())){
					persons.add(person);
					person = null;
					break;
				}
			}
			//读取下一个节点
			event = pullParser.next();
		}
		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()+"");
			
			serializer.startTag(null,"name");
			serializer.text(person.getName());
			serializer.endTag(null,"name");
			
			serializer.startTag(null,"age");
			serializer.text(person.getAge()+"");
			serializer.endTag(null,"age");
			
			serializer.endTag(null,"person");
		}
		serializer.endTag(null,"persons");
		serializer.endDocument();
		out.flush();
		out.close();
	}

	private final static String TAG = "XmlTest";
	public void testParse() throws Exception{
		InputStream in = this.getClass().getClassLoader().getResourceAsStream("orathee.xml");
		List<Person> persons = PersonService.getPersons(in);
		for (Person person : persons) {
			Log.i(TAG,person.toString());
		}
	}
	public void testSave() throws Exception{
		List<Person> persons = new ArrayList<Person>();
		persons.add(new Person(3,"nimei",21));
		persons.add(new Person(4,"lilei",22));
		persons.add(new Person(5,"hanmeimei",23));
		persons.add(new Person(6,"jim",24));
		File file = new File(getContext().getFilesDir(),"test.xml");
		FileOutputStream out = new FileOutputStream(file);
		PersonService.save(persons,out);
	}

（编辑：李大同）

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