XML的解析和序列化

public class Test extends TestCase {

    public void test() throws IllegalStateException, RuntimeException, IOException {
        writeXMLTOLocal();
        
        List<Person> personList = parserXmlFromLocal();
        
        for (Person person : personList) {
            Log.i("TestCase", person.toString());
        }
    }

    public void writeXMLTOLocal() throws RuntimeException,
            IllegalStateException, IOException {
        List<Person> personlist = getPersondList();
        // 获得序列化对象
        XmlSerializer serializer = Xml.newSerializer();

        File path = new File(Environment.getExternalStorageDirectory(),
                "person.xml");
        FileOutputStream fos;
        try {
            fos = new FileOutputStream(path);
            serializer.setOutput(fos, "utf-8");

            serializer.startDocument("utf-8", true);
            serializer.startTag(null, "persons");

            for (Person person : personlist) {
                serializer.startTag(null, "person");
                serializer.attribute(null, "id", String.valueOf(person.getId()));

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

                // 写年龄
                serializer.startTag(null, "age"); // <age>
                serializer.text(String.valueOf(person.getAge()));
                serializer.endTag(null, "age"); // </age>

                serializer.endTag(null, "person"); // </person>
            }

            serializer.endTag(null, "persons"); // </persons>

            serializer.endDocument(); // 结束
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
    
    private List<Person> parserXmlFromLocal() {
        try {
            File path = new File(Environment.getExternalStorageDirectory(), "person.xml");
            FileInputStream fis = new FileInputStream(path);
            
            // 获得pull解析器对象
            XmlPullParser parser = Xml.newPullParser();
            // 指定解析的文件和编码格式
            parser.setInput(fis, "utf-8");
            
            int eventType = parser.getEventType();         // 获得事件类型
            
            List<Person> personList = null;
            Person person = null;
            String id;
            while(eventType != XmlPullParser.END_DOCUMENT) {
                String tagName = parser.getName();    // 获得当前节点的名称
                
                switch (eventType) {
                case XmlPullParser.START_TAG:         // 当前等于开始节点  <person>
                    if("persons".equals(tagName)) {    // <persons>
                        personList = new ArrayList<Person>();
                    } else if("person".equals(tagName)) { // <person id="1">
                        person = new Person();
                        id = parser.getAttributeValue(null, "id");
                        person.setId(Integer.valueOf(id));
                    } else if("name".equals(tagName)) { // <name>
                        person.setName(parser.nextText());
                    } else if("age".equals(tagName)) { // <age>
                        person.setAge(Integer.parseInt(parser.nextText()));
                    }
                    break;
                case XmlPullParser.END_TAG:        // </persons>
                    if("person".equals(tagName)) {
                        // 需要把上面设置好值的person对象添加到集合中
                        personList.add(person);
                    }
                    break;
                default:
                    break;
                }
                
                eventType = parser.next();        // 获得下一个事件类型
            }
            return personList;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    private List<Person> getPersondList() {
        List<Person> personlist = new ArrayList<Person>();
        for (int i = 0; i < 30; i++) {
            personlist.add(new Person(i, "wang" + i, 18 + i));
        }

        return personlist;
    }

}