java还提供SAX和DOM用于解析XML
Android还集成了Pull解析器——推荐
package cn.itcast.service;import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlSerializer;import android.util.Xml;import cn.itcast.domain.Person;public class PersonService {/*** 读取数据* @param xml* @return* @throws Exception*/public static List<Person> getPersons(InputStream xml) throws Exception{List<Person> persons = null;Person person = null;XmlPullParser pullparser = Xml.newPullParser();pullparser.setInput(xml, "UTF-8");int event = pullparser.getEventType();while (event!=pullparser.END_DOCUMENT){switch (event) {case XmlPullParser.START_DOCUMENT:// 数据初始化persons = new ArrayList<Person>();break;case XmlPullParser.START_TAG:// 数据readif ("person".equals(pullparser.getName())){int id = new Integer(pullparser.getAttributeValue(0));person = new Person();person.setId(id);}if ("name".equals(pullparser.getName())) {String name = pullparser.nextText();person.setName(name);}if ("age".equals(pullparser.getName())) {int age = new Integer(pullparser.nextText());person.setAge(age);} break;case XmlPullParser.END_TAG:if ("person".equals(pullparser.getName())){persons.add(person);}break;default:break;} event = pullparser.next(); }return persons;}/*** 保存数据* @param persons* @param out* @throws Exception*/public static void savePersons(List<Person> persons, OutputStream out) throws Exception{XmlSerializer serializer = Xml.newSerializer();serializer.setOutput(out, "UTF-8");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().toString());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();out.flush();out.close();} }
// 单元测试
<instrumentationandroid:name="android.test.InstrumentationTestRunner"android:targetPackage="cn.itcast.xml" /><application<uses-library android:name="android.test.runner" />
public class PersonServiceTest extends AndroidTestCase {public void testPersons() throws Exception{ InputStream xml = this.getClass().getClassLoader().getResourceAsStream("person.xml");List<Person> persons = PersonService.getPersons(xml);for (Person person:persons){Log.i("test111", person.toString());} }public void testSave() throws Exception{List<Person> persons = new ArrayList<Person>();persons.add(new Person(10, "10", 10));persons.add(new Person(20, "20", 20)); File xml = new File(getContext().getFilesDir(), "itcast.xml");FileOutputStream outputStream = new FileOutputStream(xml); PersonService.savePersons(persons, outputStream); outputStream.close(); } }
// 数据结构
package cn.itcast.domain;public class Person {private Integer id;private String name;private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Person(Integer id, String name, Integer age) {this.id = id;this.name = name;this.age = age;}public Person() {}}
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