XML三种解析方式

String xml = "<persons>" +
                    "<person>" +
                    "<name>amos</name>" +
                    "<age>30</age>" +
                    "</person>" +
                    "<person>" +
                    "<name>tom</name>" +
                    "<age>18</age>" +
                    "</person>" +
                    "</persons>";

            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document parse = builder.parse(new ByteArrayInputStream(xml.getBytes()));

            Element element = parse.getDocumentElement();

            NodeList nodes = element.getElementsByTagName("person");
            for (int i = 0; i < nodes.getLength(); i++) {
                NodeList person = nodes.item(i).getChildNodes();
                for (int j = 0; j < person.getLength(); j++) {
                    if (person.item(j) instanceof Element)
                        Log.d("TAG","name:" + person.item(j).getNodeName() + ",value:" + person.item(j).getTextContent());
                }
            }

 SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
 saxParser.parse(new ByteArrayInputStream(xml.getBytes()), new MyDefaultHandler());

class MyDefaultHandler extends DefaultHandler {

        String currentTag;

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            super.startElement(uri, localName, qName, attributes);
            currentTag = localName;
        }

        @Override
        public void characters(char[] ch, int start, int length)
                throws SAXException {
            super.characters(ch, start, length);
            String value = new String(ch, start, length); // 将当前TextNode转换为String
            Log.d("TAG","name:" + currentTag + ",value:" + value);
        }
    }

    XmlPullParser xmlPullParser = XmlPullParserFactory.newInstance().newPullParser();
            xmlPullParser.setInput(new ByteArrayInputStream(xml.getBytes()), "UTF-8");
            int eventType = xmlPullParser.getEventType();
            boolean isEnd = false;
            while (!isEnd) {
                switch (eventType) {
                    case XmlPullParser.START_DOCUMENT:
                        Log.d("TAG","START_DOCUMENT---name:" + xmlPullParser.getName());
                        break;
                    case XmlPullParser.START_TAG:
                        if (xmlPullParser.getName().equals("name")) {
                            String name = xmlPullParser.nextText();
                            Log.d("TAG","name:" + xmlPullParser.getName() + ",value:" + name);
                        } else if (xmlPullParser.getName().equals("age")) {
                            String name = xmlPullParser.nextText();
                            Log.d("TAG","name:" + xmlPullParser.getName() + ",value:" + name);
                        }
                        break;
                    case XmlPullParser.END_TAG:
                        Log.d("TAG","END_TAG---name:" + xmlPullParser.getName());
                        break;
                    case XmlPullParser.END_DOCUMENT:
                        Log.d("TAG","END_DOCUMENT---name:" + xmlPullParser.getName());
                        isEnd = true;
                        break;
                }
                eventType = xmlPullParser.next();
            }