使用Pull解析器读取XML文件和生成XML文件Pull解析技术除了可以使用 SAX和DOM解析XML文件，大家也可以使用An
使用Pull解析器读取XML文件和生成XML文件
Pull解析技术
除了可以使用 SAX和DOM解析XML文件，大家也可以使用Android内置的Pull解析器解析XML文件。 Pull解析器的运行方式与 SAX 解析器相似。它提供了类似的事件，如：开始元素和结束元素事件，使用parser.next()可以进入下一个元素并触发相应事件。事件将作为数值代码被发送，因此可以使用一个switch对感兴趣的事件进行处理。当元素开始解析时，调用parser.nextText()方法可以获取下一个Text类型元素的值。 Pull解析器的源码及文档下载网址：http://www.xmlpull.org/ Pull解析技术是第三方开发的开源技术，它同样可以应用于JavaSE开发。在《使用SAX读取XML文件》文章中的com.jbridge.xml.service包下添加类：package com.jbridge.xml.serviceimport java.io.InputStream;import java.io.OutputStream;import java.io.Writer;import java.util.ArrayList;import java.util.List;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserFactory;import org.xmlpull.v1.XmlSerializer;import com.jbridge.xml.domain.Person;import android.util.Xml;public class PullPersonService {public static List<Person> getPersons(InputStream inStream)throws Exception {List<Person> persons = null;Person person = null;// 创建Pull解析// xmlPullParserFactory=XmlPullParserFactory.newInstance();// XmlPullParser pullParser =xmlPullParserFactory.newPullParser();XmlPullParser pullParser = Xml.newPullParser();// 这行代码同上面两行// 解析XMLpullParser.setInput(inStream, "UTF-8");// 开始int event = pullParser.getEventType();while (event != XmlPullParser.END_DOCUMENT) {switch (event) {// 文档开始case XmlPullParser.START_DOCUMENT:persons = new ArrayList<Person>();break;// 节点开始case XmlPullParser.START_TAG:if ("person".equals(pullParser.getName())) {int id = new Integer(pullParser.getAttributeValue(0));person = new Person();person.setId(id);}if (person != null) {if ("name".equals(pullParser.getName())) {String name = pullParser.nextText();// 如果后面是Text元素,即返回它的值person.setName(name);} else if ("age".equals(pullParser.getName())) {String age = pullParser.nextText();person.setAge(new Short(age));}}break;// 节点结束case XmlPullParser.END_TAG:if ("person".equals(pullParser.getName())) {persons.add(person);person = null;}break;}event = pullParser.next();}return persons;}public static void save(List<Person> persons, OutputStream outStream) throws Exception{? ?XmlSerializer serializer = Xml.newSerializer();? ?serializer.setOutput(outStream, "UTF-8");? ?serializer.startDocument("UTF-8", true);? ?serializer.startTag(null, "persons");// serializer.startTag("", "persons");? ?for(Person person : persons){? ? ?serializer.startTag(null, "person");// serializer.startTag("", "person");? ? ?serializer.attribute(null, "id", person.getId().toString()); // serializer.attribute("", "id", person.getId().toString());? ? ?serializer.startTag(null, "name"); ?//serializer.startTag("", "name");? ? ?serializer.text(person.getName());? ? ?serializer.endTag(null, "name");// serializer.endTag("", "name");? ? ?? ? ?serializer.startTag(null, "age"); //serializer.startTag("", "age");? ? ?serializer.text(person.getAge().toString());? ? ?serializer.endTag(null, "age"); // serializer.endTag("", "age");? ? ?serializer.endTag(null, "person");//serializer.endTag("", "person");? ?} ? ?? ?serializer.endTag(null, "persons"); ? ?//serializer.endTag("", "persons");?? ?serializer.endDocument();? ?outStream.flush();? ?outStream.close();}public static void save(List<Person> persons,Writer write) throws Exception{? ?XmlSerializer serializer = Xml.newSerializer();? ?serializer.setOutput(write);? ?serializer.startDocument("UTF-8", true);? ?serializer.startTag(null, "persons");// serializer.startTag("", "persons");? ?for(Person person : persons){? ? ?serializer.startTag(null, "person");// serializer.startTag("", "person");? ? ?serializer.attribute(null, "id", person.getId().toString()); // serializer.attribute("", "id", person.getId().toString());? ? ?serializer.startTag(null, "name"); ?//serializer.startTag("", "name");? ? ?serializer.text(person.getName());? ? ?serializer.endTag(null, "name");// serializer.endTag("", "name");? ? ?? ? ?serializer.startTag(null, "age"); //serializer.startTag("", "age");? ? ?serializer.text(person.getAge().toString());? ? ?serializer.endTag(null, "age"); // serializer.endTag("", "age");? ? ?serializer.endTag(null, "person");//serializer.endTag("", "person");? ?} ? ?? ?serializer.endTag(null, "persons"); ? ?//serializer.endTag("", "persons");?? ?serializer.endDocument();? ?write.flush();? ?write.close();}}
在《使用SAX读取XML文件》文章中的TestService类下添加方法：public void testPullGetPersons() throws Throwable{ InputStream inStream = this.getClass().getClassLoader().getResourceAsStream("person.xml");PullPersonService pullPersonService=new PullPersonService();List<Person> persons = pullPersonService.getPersons(inStream);for(Person person : persons){Log.i(TAG, person.toString());}}public void testPullSave() throws Throwable{// List<Person> persons = new ArrayList<Person>();// persons.add(new Person(34, "xiaozhang", (short)30));// persons.add(new Person(56, "xiaozhu", (short)12));// persons.add(new Person(89, "xiaoli", (short)50));// File file = new File(this.getContext().getFilesDir(), "zyj.xml");// ?/data/data/com.jbridge.xml.activity/files/zyj.xml// FileOutputStream outStream = new FileOutputStream(file);// BufferedOutputStream b=new BufferedOutputStream(outStream);// OutputStreamWriter outStreamWriter = new OutputStreamWriter(outStream, "UTF-8");// BufferedWriter writer = new BufferedWriter(outStreamWriter);// PullPersonService.save(persons, b);// List<Person> persons = new ArrayList<Person>();// persons.add(new Person(34, "xiaozhang", (short)30));// persons.add(new Person(56, "xiaozhu", (short)12));// persons.add(new Person(89, "xiaoli", (short)50));// File file = new File(this.getContext().getFilesDir(), "zyj.xml");// FileOutputStream outStream = new FileOutputStream(file);// OutputStreamWriter outStreamWriter = new OutputStreamWriter(outStream, "UTF-8");// BufferedWriter writer = new BufferedWriter(outStreamWriter);// PullPersonService.save(persons, writer);// 生成到内存中。List<Person> persons = new ArrayList<Person>();persons.add(new Person(34, "xiaozhang", (short)30));persons.add(new Person(56, "xiaozhu", (short)12));persons.add(new Person(89, "xiaoli", (short)50));StringWriter sw=new StringWriter();PullPersonService.save(persons,sw);Log.i(TAG, sw.toString());}
