android 通过pull解析xml文件

  1 package com.example.xmldemo.test;

  2 

  3 import java.io.File;

  4 import java.io.FileInputStream;

  5 import java.io.FileNotFoundException;

  6 import java.io.FileOutputStream;

  7 import java.io.IOException;

  8 import java.io.InputStreamReader;

  9 import java.util.ArrayList;

 10 import java.util.List;

 11 

 12 import org.xmlpull.v1.XmlPullParser;

 13 import org.xmlpull.v1.XmlSerializer;

 14 

 15 import com.example.xmldemo.Person;

 16 

 17 import android.os.Environment;

 18 import android.test.AndroidTestCase;

 19 import android.util.Log;

 20 import android.util.Xml;

 21 

 22 public class XmlTest extends AndroidTestCase

 23 {    

 24     public void test()

 25     {

 26         writeLocal();

 27         

 28         List<Person> personList = parseXml();

 29         for(Person person : personList)

 30         {

 31             Log.i("XmlTest", person.toString());

 32         }

 33     }

 34     /**

 35      * 写xml文件大本地

 36      */

 37     public void writeLocal()

 38     {

 39         List<Person> personList = getPersonList();

 40         //获得序列化对象

 41         XmlSerializer serializer = Xml.newSerializer();

 42         // 

 43         try

 44         {

 45             //创建文件流对象

 46             File file = new File("data/data/com.example.xmldemo", "persons.xml");

 47             FileOutputStream fos = new FileOutputStream(file);

 48             //设置文件的输出流

 49             serializer.setOutput(fos, "UTF-8");

 50             serializer.startDocument("utf-8", true); //<?xml version

 51             serializer.startTag(null, "persons"); //<persons>

 52             for(Person person : personList)

 53             {

 54                 serializer.startTag(null, "person"); //<person>

 55                 serializer.attribute(null, "id", String.valueOf(person.getId()));

 56                 serializer.startTag(null, "name"); //<name>

 57                 serializer.text(person.getName()); // kite1

 58                 serializer.endTag(null, "name"); //</name>

 59                 serializer.startTag(null, "age"); //<age>

 60                 serializer.text(String.valueOf(person.getAge()));

 61                 serializer.endTag(null, "age");//</age>

 62                 serializer.endTag(null, "person"); //<person>

 63             }

 64             serializer.endTag(null, "persons"); //</persons>

 65             serializer.endDocument();

 66             serializer.flush();

 67             fos.flush();

 68             fos.close();

 69         } catch (Exception e)

 70         {

 71             e.printStackTrace();

 72         }

 73         

 74     }

 75     /**

 76      * 获得personList

 77      * @return

 78      */

 79     public List<Person> getPersonList()

 80     {

 81         List<Person> personList = new ArrayList<Person>();

 82         for(int i = 0; i < 30; i++)

 83         {

 84             Person person = new Person(i, "kite" + 1,18 + i);

 85             personList.add(person);

 86         }

 87         return personList;

 88     }

 89     

 90     public List<Person> parseXml()

 91     {

 92     

 93         try

 94         {

 95             //创建文件流对象

 96             File file = new File("data/data/com.example.xmldemo", "persons.xml");

 97             FileInputStream fis = new FileInputStream(file);

 98             //获得pull 解析对象

 99             XmlPullParser parser = Xml.newPullParser();

100             // 指定解析的文件和编码格式

101             parser.setInput(fis,"utf-8");

102             int eventType = parser.getEventType(); //获得事件的类型

103             

104             //初始化集合

105             List<Person> personList = null;

106             Person person = null;

107             //如果不是最后的endDocument

108             while(eventType != XmlPullParser.END_DOCUMENT)

109             {

110                 String tagName = parser.getName();

111                 switch (eventType)

112                 {

113                 case XmlPullParser.START_TAG:

114                         //如果是最开始的persons 根节点初始化

115                         if("persons".equals(tagName))

116                         {

117                             personList = new ArrayList<Person>();

118                         } else if("person".equals(tagName))

119                         {

120                             //初始化person对象

121                             person = new Person();

122                             

123                             //获得id

124                             String id =  parser.getAttributeValue(null, "id");

125                             person.setId(Integer.parseInt(id));

126                         } else if("name".equals(tagName))

127                         {

128                             person.setName(parser.nextText());

129                         } else if("age".equals(tagName))

130                         {

131                             person.setAge(Integer.parseInt(parser.nextText()));

132                         }

133                     break;

134                 case XmlPullParser.END_TAG:

135                     //如果是结束标记

136                     if("person".equals(tagName))

137                     {

138                         // 需要把上面设置好值的person对象添加到集合中

139                         personList.add(person);

140                     } 

141                     break;

142                 default:    

143                     break;

144                 }

145                 //获得下一个事件

146                 eventType = parser.next();

147             }

148             return personList;

149         } catch (Exception e)

150         {

151             // TODO Auto-generated catch block

152             e.printStackTrace();

153         }

154         return null;

155     }

156     

157 }

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