Android XML数据的三种解析方式

<students> <student>  <name sex="man">小明</name>  <nickName>明明</nickName> </student> <student>  <name sex="woman">小红</name>  <nickName>红红</nickName> </student> <student>  <name sex="man">小亮</name>  <nickName>亮亮</nickName> </student></students>

public class Student { private String name; private String sex; private String nickName; public String getName() {  return name; } public void setName(String name) {  this.name = name; } public String getSex() {  return sex; } public void setSex(String sex) {  this.sex = sex; } public String getNickName() {  return nickName; } public void setNickName(String nickName) {  this.nickName = nickName; } @Override public String toString() {  return "Student{" +    "name='" + name + '/'' +    ", sex='" + sex + '/'' +    ", nickName='" + nickName + '/'' +    '}'; }}

public List<Student> dom2xml(InputStream is) throws Exception { //一系列的初始化 List<Student> list = new ArrayList<>(); DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); //获得Document对象 Document document = builder.parse(is); //获得student的List NodeList studentList = document.getElementsByTagName("student"); //遍历student标签 for (int i = 0; i < studentList.getLength(); i++) {  //获得student标签  Node node_student = studentList.item(i);  //获得student标签里面的标签  NodeList childNodes = node_student.getChildNodes();  //新建student对象  Student student = new Student();  //遍历student标签里面的标签  for (int j = 0; j < childNodes.getLength(); j++) {   //获得name和nickName标签   Node childNode = childNodes.item(j);   //判断是name还是nickName   if ("name".equals(childNode.getNodeName())) {    String name = childNode.getTextContent();    student.setName(name);    //获取name的属性    NamedNodeMap nnm = childNode.getAttributes();    //获取sex属性，由于只有一个属性，所以取0    Node n = nnm.item(0);    student.setSex(n.getTextContent());   } else if ("nickName".equals(childNode.getNodeName())) {    String nickName = childNode.getTextContent();    student.setNickName(nickName);   }  }  //加到List中  list.add(student); } return list;}

public List<Student> sax2xml(InputStream is) throws Exception { SAXParserFactory spf = SAXParserFactory.newInstance(); //初始化Sax解析器 SAXParser sp = spf.newSAXParser(); //新建解析处理器 MyHandler handler = new MyHandler(); //将解析交给处理器 sp.parse(is, handler); //返回List return handler.getList();}public class MyHandler extends DefaultHandler { private List<Student> list; private Student student; //用于存储读取的临时变量 private String tempString; /**  * 解析到文档开始调用，一般做初始化操作  *  * @throws SAXException  */ @Override public void startDocument() throws SAXException {  list = new ArrayList<>();  super.startDocument(); } /**  * 解析到文档末尾调用，一般做回收操作  *  * @throws SAXException  */ @Override public void endDocument() throws SAXException {  super.endDocument(); } /**  * 每读到一个元素就调用该方法  *  * @param uri  * @param localName  * @param qName  * @param attributes  * @throws SAXException  */ @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {  if ("student".equals(qName)) {   //读到student标签   student = new Student();  } else if ("name".equals(qName)) {   //获取name里面的属性   String sex = attributes.getValue("sex");   student.setSex(sex);  }  super.startElement(uri, localName, qName, attributes); } /**  * 读到元素的结尾调用  *  * @param uri  * @param localName  * @param qName  * @throws SAXException  */ @Override public void endElement(String uri, String localName, String qName) throws SAXException {  if ("student".equals(qName)) {   list.add(student);  }  if ("name".equals(qName)) {   student.setName(tempString);  } else if ("nickName".equals(qName)) {   student.setNickName(qName);  }  super.endElement(uri, localName, qName); } /**  * 读到属性内容调用  *  * @param ch  * @param start  * @param length  * @throws SAXException  */ @Override public void characters(char[] ch, int start, int length) throws SAXException {  tempString = new String(ch, start, length);  super.characters(ch, start, length); } /**  * 获取该List  *  * @return  */ public List<Student> getList() {  return list; }}

public List<Student> pull2xml(InputStream is) throws Exception { List<Student> list = null; Student student = null; //创建xmlPull解析器 XmlPullParser parser = Xml.newPullParser(); ///初始化xmlPull解析器 parser.setInput(is, "utf-8"); //读取文件的类型 int type = parser.getEventType(); //无限判断文件类型进行读取 while (type != XmlPullParser.END_DOCUMENT) {  switch (type) {   //开始标签   case XmlPullParser.START_TAG:    if ("students".equals(parser.getName())) {     list = new ArrayList<>();    } else if ("student".equals(parser.getName())) {     student = new Student();    } else if ("name".equals(parser.getName())) {     //获取sex属性     String sex = parser.getAttributeValue(null,"sex");     student.setSex(sex);     //获取name值     String name = parser.nextText();     student.setName(name);    } else if ("nickName".equals(parser.getName())) {     //获取nickName值     String nickName = parser.nextText();     student.setNickName(nickName);    }    break;   //结束标签   case XmlPullParser.END_TAG:    if ("student".equals(parser.getName())) {     list.add(student);    }    break;  }  //继续往下读取标签类型  type = parser.next(); } return list;}

public class XmlActivity extends AppCompatActivity implements View.OnClickListener { private TextView tv; private Button bt_dom, bt_sax, bt_pull; private XmlUtils xmlUtils; private List<Student> students; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_xml);  tv = (TextView) findViewById(R.id.tv);  bt_dom = (Button) findViewById(R.id.bt_dom);  bt_sax = (Button) findViewById(R.id.bt_sax);  bt_pull = (Button) findViewById(R.id.bt_pull);  bt_dom.setOnClickListener(this);  bt_sax.setOnClickListener(this);  bt_pull.setOnClickListener(this);  xmlUtils = new XmlUtils(); } @Override public void onClick(View v) {  switch (v.getId()) {   case R.id.bt_dom:    try {     students = xmlUtils.dom2xml(getResources().getAssets().open("student.xml"));     tv.setText(students.toString());    } catch (Exception e) {     e.printStackTrace();    }    break;   case R.id.bt_sax:    try {     students = xmlUtils.sax2xml(getResources().getAssets().open("student.xml"));     tv.setText(students.toString());    } catch (Exception e) {     e.printStackTrace();    }    break;   case R.id.bt_pull:    try {     students = xmlUtils.pull2xml(getResources().getAssets().open("student.xml"));     tv.setText(students.toString());    } catch (Exception e) {     e.printStackTrace();    }    break;  } }}