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xml文件pull的解析,
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- //分三部分1是得到实体类.2是得到干活的类personservice.3是在主活动调用干活的类做输出.
- package cn.itcast.xml.domain;
-
- public class Person {
- private int id;
- private String name;
- private int age;
-
- public Person(){
-
- }
-
-
- public Person(int id,String name,int age) {
- this.id = id;
- this.name = name;
- this.setAge(age);
- }
-
- public int getId() {
- return id;
- }
-
- public void setId(int id) {
- this.id = id;
- }
-
- public String getName() {
- return name;
- }
-
- public void setName(String name) {
- this.name = name;
- }
-
- public int getAge() {
- return age;
- }
-
- public void setAge(int age) {
- if (age > 0 && age < 100) {
- this.age = age;
- }else{
- this.age = 0;
- }
-
- }
-
- }
- <pre class="java" name="code">package cn.itcast.xml.service;
-
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.util.ArrayList;
- import java.util.List;
-
- import org.xmlpull.v1.XmlPullParser;
- import org.xmlpull.v1.XmlSerializer;
-
- import android.content.Context;
- import android.content.res.AssetManager;
- import android.os.Environment;
- import android.util.Xml;
- import android.widget.Toast;
-
- import cn.itcast.xml.domain.Person;
-
- public class PersonService {
- private Context context;
-
- public PersonService(Context context) {
- this.context = context;
- }
-
- /**
- * 把person.xml的输入流 解析 转化成list集合
- * @param filename assets目录下的文件名
- * @return
- */
- public List<Person> getPersons(String filename){
- AssetManager manager = context.getAssets();
- try {
- InputStream is = manager.open(filename);
- //在android下使用pull解析xml文件
- //1.获取pull解析器的实例
- XmlPullParser parser = Xml.newPullParser();
- //2.设置解析器的一些参数
- parser.setInput(is,"utf-8");
- // 获取pull解析器对应的事件类型
- int type = parser.getEventType();
- Person person = null;
- List<Person> persons = new ArrayList<Person>();
- while(type!=XmlPullParser.END_DOCUMENT){
-
- if(type==XmlPullParser.START_TAG){
- if("person".equals(parser.getName())){
- person = new Person();
- int id =Integer.parseInt( parser.getAttributeValue(0));
- person.setId(id);
- }else if("name".equals(parser.getName())){
- String name = parser.nextText();
- person.setName(name);
- }else if("age".equals(parser.getName())){
- int age = Integer.parseInt( parser.nextText());
- person.setAge(age);
- }
- }
- if(type==XmlPullParser.END_TAG){
- if("person".equals(parser.getName())){
- persons.add(person);
- person = null;
- }
- }
-
-
- type = parser.next();
- }
-
- return persons;
-
-
- } catch (Exception e) {
- e.printStackTrace();
- Toast.makeText(context,"获取person.xml失败",Toast.LENGTH_SHORT).show();
- return null;
- }
- }
-
- /**
- * 把persons集合里面的内容写到xml文件里面
- * @param persons person的集合
- * @return
- */
- public boolean savePersonToXml(List<Person> persons){
- try {
- XmlSerializer serializer = Xml.newSerializer();
- // /sdcard/person.xml
- // mount unmount 文件系统的权限
- File file = new File(Environment.getExternalStorageDirectory(),"person.xml");
- FileOutputStream fos = new FileOutputStream(file);
- serializer.setOutput(fos,"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()+"");
-
- serializer.startTag(null,"name");
- serializer.text(person.getName());
- serializer.endTag(null,"name");
-
- serializer.startTag(null,"age");
- serializer.text(person.getAge()+"");
- serializer.endTag(null,"age");
-
-
- serializer.endTag(null,"person");
- }
- serializer.endTag(null,"persons");
- serializer.endDocument();
- fos.flush();
- fos.close();
- return true;
- } catch (Exception e) {
- e.printStackTrace();
- return false;
- }
-
-
- }
-
- }
- <pre class="java" name="code">package cn.itcast.xml;
-
- import java.util.List;
-
- import cn.itcast.xml.domain.Person;
- import cn.itcast.xml.service.PersonService;
- import android.app.Activity;
- import android.os.Bundle;
- import android.widget.TextView;
-
- public class MainActivity extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- TextView tv = (TextView) this.findViewById(R.id.tv);
- PersonService service = new PersonService(this);
- List<Person> persons = service.getPersons("person.xml");
- StringBuffer sb = new StringBuffer();
- for(Person person : persons){
- String age = "年龄"+ person.getAge();
- String name =person.getName();
- String id = "id="+ person.getId();
- sb.append(name +" "+ age+" "+id);
- }
- tv.setText( sb.toString());
- }
- }
- package cn.itcast.xml.test;
-
- import java.util.ArrayList;
- import java.util.List;
-
- import cn.itcast.xml.domain.Person;
- import cn.itcast.xml.service.PersonService;
- import android.test.AndroidTestCase;
- import android.util.Log;
-
- public class TestPersonService extends AndroidTestCase {
-
- private static final String TAG = "TestPersonService";
-
- public void testGetPersons() throws Exception{
- PersonService service = new PersonService(getContext());
- List<Person> persons = service.getPersons("person.xml");
- assertEquals(2,persons.size());
- Log.i(TAG,persons.get(0).getName());
- }
-
-
- public void testSavePersons() throws Exception{
- PersonService service = new PersonService(getContext());
- List<Person> persons = new ArrayList<Person>();
- Person p1 = new Person(21,"张三",18);
- Person p2 = new Person(27,"李四",29);
- Person p3 = new Person(29,"wangwu",-3);
- persons.add(p1);
- persons.add(p2);
- persons.add(p3);
- assertEquals(true,service.savePersonToXml(persons)) ;
-
- }
- }