Android中三种解析XML的方法SAX DOM PULL，推荐使用PULL
0.xml文件
<?xml version="1.0" encoding="UTF-8"?> <persons> <person id="23"> <name>李明</name> <age>30</age> </person> <person id="20"> <name>李向梅</name> <age>25</age> </person> </persons>
1.SAX
public class SAXPersonService {
public List<Person> getPersons(InputStream inStream) throws Throwable{
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
PersonParser personParser = new PersonParser();
parser.parse(inStream, personParser);
inStream.close();
return personParser.getPersons();
}
private final class PersonParser extends DefaultHandler{
private List<Person> persons = null;
private String tag = null;
private Person person = null;
public List<Person> getPersons() {
return persons;
}
@Override
public void startDocument() throws SAXException {
persons = new ArrayList<Person>();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
if("person".equals(localName)){
person = new Person();
person.setId(new Integer(attributes.getValue(0)));
}
tag = localName;
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if(tag!=null){
String data = new String(ch, start, length);//获取文本节点的数据
if("name".equals(tag)){
person.setName(data);
}else if("age".equals(tag)){
person.setAge(new Short(data));
}
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if("person".equals(localName)){
persons.add(person);
person = null;
}
tag = null;
}
}
}
2.DOM
public class DOMPersonService {
public static List<Person> getPersons(InputStream inStream) throws Throwable{
List<Person> persons = new ArrayList<Person>();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document documnet = builder.parse(inStream);
Element root = documnet.getDocumentElement();
NodeList personNodes = root.getElementsByTagName("person");
for(int i=0 ; i < personNodes.getLength(); i++){
Person person = new Person();
Element personElement = (Element)personNodes.item(i);
person.setId(new Integer(personElement.getAttribute("id")));
NodeList personChilds = personElement.getChildNodes();
for(int y=0 ; y < personChilds.getLength(); y++){
if(personChilds.item(y).getNodeType()==Node.ELEMENT_NODE){//判断当前节点是否是元素类型节点
Element childElement = (Element)personChilds.item(y);
if("name".equals(childElement.getNodeName())){
person.setName(childElement.getFirstChild().getNodeValue());
}else if("age".equals(childElement.getNodeName())){
person.setAge(new Short(childElement.getFirstChild().getNodeValue()));
}
}
}
persons.add(person);
}
return persons;
}
}
3.Pull
public class PULLPersonService {
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();
}
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;
}
}
测试类
public class PersonServiceTest extends AndroidTestCase {
private static final String TAG = "PersonServiceTest";
public void testSAXGetPersons() throws Throwable{
SAXPersonService service = new SAXPersonService();
InputStream inStream = getClass().getClassLoader().getResourceAsStream("itcast.xml");
List<Person> persons = service.getPersons(inStream);
for(Person person : persons){
Log.i(TAG, person.toString());
}
}
public void testDomGetPersons() throws Throwable{
InputStream inStream = getClass().getClassLoader().getResourceAsStream("itcast.xml");
List<Person> persons = DOMPersonService.getPersons(inStream);
for(Person person : persons){
Log.i(TAG, person.toString());
}
}
public void testPullGetPersons() throws Throwable{
InputStream inStream = getClass().getClassLoader().getResourceAsStream("itcast.xml");
List<Person> persons = PULLPersonService.getPersons(inStream);
for(Person person : persons){
Log.i(TAG, person.toString());
}
}
public void testSave() throws Throwable{
//File file = new File(this.getContext().getFilesDir(), "person.xml");
//FileOutputStream outStream = new FileOutputStream(file);
List<Person> persons = new ArrayList<Person>();
persons.add(new Person(34, "lili", (short)12));
persons.add(new Person(56, "老毕", (short)32));
persons.add(new Person(39, "老张", (short)40));
/*FileOutputStream outStream = this.getContext().openFileOutput("person.xml", Context.MODE_PRIVATE);
OutputStreamWriter writer = new OutputStreamWriter(outStream, "UTF-8");
BufferedWriter bWriter = new BufferedWriter(writer);
*/
StringWriter writer = new StringWriter();
PULLPersonService.save(persons, writer);
Log.i(TAG, writer.toString());
}
}