Android之XML序列化和解析

XML文件是一种常用的文件格式，可以用来存储与传递数据，本文是XML文件序列化与解析的一个简单示例

写文件到本地，并用XML格式存储

/*** 写xml文件到本地*/private void writeXmlToLocal() {List<Person> personList = getPersonList();// 获得序列化对象XmlSerializer serializer = Xml.newSerializer();try {File path = new File(Environment.getExternalStorageDirectory(), "persons.xml");FileOutputStream fos = new FileOutputStream(path);// 指定序列化对象输出的位置和编码serializer.setOutput(fos, "utf-8");serializer.startDocument("utf-8", true);    // 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?>serializer.startTag(null, "persons");       // <persons>for (Person person : personList) {// 开始写人serializer.startTag(null, "person");    // <person>serializer.attribute(null, "id", String.valueOf(person.getId()));// 写名字serializer.startTag(null, "name");      // <name>serializer.text(person.getName());serializer.endTag(null, "name");        // </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 (Exception e) {e.printStackTrace();}}private List<Person> getPersonList() {List<Person> personList = new ArrayList<Person>();for (int i = 0; i < 30; i++) {personList.add(new Person(i, "wang" + i, 18 + i));}return personList;}

XML解析实现

private List<Person> parserXmlFromLocal() {try {File path = new File(Environment.getExternalStorageDirectory(), "persons.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;}

测试结果

public class TestCase extends AndroidTestCase {public void test() {
//      writeXmlToLocal();List<Person> personList = parserXmlFromLocal();for (Person person : personList) {Log.i("TestCase", person.toString());}}