android使用pull解析器来解析和生成xml文件
16lz
2021-12-04
解析xml文件的方式有多种，比如SAX解析，DOM解析，PULL解析，但是在android中推荐使用pull解析方式来解析xml文件
pull解析器使用实验代码：
Person.java
package com.dqpi.model;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; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "Person [id=" + id + ", name=" + name + ", age=" + age + "]"; } public Person(Integer id, String name, Integer age) { super(); this.id = id; this.name = name; this.age = age; } public Person() { super(); }}PersonService.java
package com.dqpi.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.XmlPullParserFactory;import org.xmlpull.v1.XmlSerializer;import com.dqpi.model.Person;import android.util.Xml;/** * 使用pull解析器对person.xml文件进行解析 * @author Administrator * */public class PersonService { /** * 使用pull解析器解析xml文件 * @param xml要解析的xml文件 * @return返回解析的内容 * @throws Exception抛出的异常 */ public static List<Person> getPersons(InputStream xml) throws Exception { //用来存储解析的内容 List<Person> persons = null; //用来设置person属性内容 Person person = null; // 创建pull解析器的对象 XmlPullParser pullParser = XmlPullParserFactory.newInstance().newPullParser(); // 为pull解析器设置解析的xml数据 pullParser.setInput(xml, "UTF-8"); // 获取开始节点 int event = pullParser.getEventType(); //当没有解析到XML文件的末尾的时候继续执行解析 while (event != XmlPullParser.END_DOCUMENT) { switch (event) { case XmlPullParser.START_DOCUMENT: //对persons 和person进行初始化 persons = new ArrayList<Person>(); break; case XmlPullParser.START_TAG: if ("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); person = null; } break; } //触发下一个节点 event = pullParser.next(); } return persons; } /** * 生成xml文件 * @param persons生成xml的件的数据来源 * @param outputStream文件输出的对象 * @throws Exception抛出的异常 */ public static void save(List<Person> persons,OutputStream outputStream)throws Exception{ XmlSerializer serializer = Xml.newSerializer(); //设置输出的方向 serializer.setOutput(outputStream, "UTF-8"); //开始文档 serializer.startDocument("UTF-8", true); //文档开始节点 serializer.startTag(null, "persons"); for(Person person:persons){ //person serializer.startTag(null, "person"); serializer.attribute(null, "id", person.getId().toString()); //name serializer.startTag(null, "name"); serializer.text(person.getName()); serializer.endTag(null, "name"); //age serializer.startTag(null, "age"); serializer.text(person.getAge().toString()); serializer.endTag(null, "age"); serializer.endTag(null, "person"); } //文档结束节点 serializer.endTag(null, "persons"); //结束文档 serializer.endDocument(); //把数据刷出去 outputStream.flush(); //关闭 outputStream.close(); }}PersonServiceTest.java
package com.dqpi.test;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import com.dqpi.model.Person;import com.dqpi.service.PersonService;import android.test.AndroidTestCase;import android.util.Log;public class PersonServiceTest extends AndroidTestCase { private static final String TAG="PersonServiceTest"; 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(TAG, person.toString()); } } public void testSave()throws Exception{ List<Person> persons = new ArrayList<Person>(); persons.add(new Person(1,"张三",14)); persons.add(new Person(2,"李四",15)); persons.add(new Person(2,"赵六",20)); //存储在<包名>/file File xmlFile = new File(getContext().getFilesDir(),"dqpi.xml"); FileOutputStream outputStream = new FileOutputStream(xmlFile); PersonService.save(persons, outputStream); } }person.xml
<?xml version="1.0" encoding="UTF-8"?><persons> <person id="23"> <name>liming</name> <age>30</age> </person> <person id="20"> <name>zhangsan</name> <age>20</age> </person></persons>AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.dqpi.xml" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="22" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <uses-library android:name="android.test.runner"/> <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application><instrumentation android:label="Tests for My App" android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.dqpi.xml" /></manifest>更多相关文章
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