Android编程使用sax解析xml数据的方法详解

2019-12-12 02:27:24

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本文实例讲述了Android编程使用sax解析xml数据的方法。分享给大家供大家参考，具体如下：

随着技术的发展，现在的web已经和以前不同了。web已经逐渐像移动的方向倾斜，作为程序员的确应该拓展一下自己的知识层面。学习各方面的知识，今天就接着前几天的弄一下Android的xml解析，这次就使用sax的方式解析xml.下面就一步一步的来做吧。

1. 编写一个简单的xml

<?xml version="1.0" encoding="UTF-8"?><persons> <person id="01">   <name>will</name>   <age>21</age> </person> <person id="02">   <name>will2</name>   <age>22</age> </person></persons>

2. 编写pojo类

package org.lxh.vo;public class Person {  private String id;  private String name;  private int age;  public String getName() {    return name;  }  public void setName(String name) {    this.name = name;  }  public String toString() {    return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";  }  public int getAge() {    return age;  }  public void setAge(int age) {    this.age = age;  }  public String getId() {    return id;  }  public void setId(String id) {    this.id = id;  }}

3. 写一个解析xml的类

package org.lxh.impl;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.lxh.vo.Person;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import android.util.Log;public class Parse {  public List<Person> findAll(InputStream in) throws Exception {    SAXParserFactory factory = SAXParserFactory.newInstance(); //创建解析工厂    SAXParser parser = factory.newSAXParser();    ParsePerson chuli = new ParsePerson();    parser.parse(in, chuli);    in.close(); //关闭输入流    return chuli.getData();  }  //开始解析xml  public class ParsePerson extends DefaultHandler {    List<Person> all = null;    Person person = null;    String flag = null;    public List<Person> getData() {      return all;    }    public void startDocument() throws SAXException {      all = new ArrayList<Person>(); //实例化集合    }    public void startElement(String uri, String localName, String qName,        Attributes attributes) throws SAXException {      if ("person".equals(localName)) {        person = new Person();        person.setId(attributes.getValue(0)); //取得id的内容      }      flag = localName; //记录上一个element    }    public void characters(char[] ch, int start, int length)        throws SAXException {      if (flag != null) { //这样做取得的值就不会重复        String data = new String(ch, start, length);        if ("name".equals(flag)) {          person.setName(data);        }        else if ("age".equals(flag)) {          person.setAge(Integer.parseInt(data));        }      }    }    public void endElement(String uri, String localName, String qName)        throws SAXException {      if ("person".equals(localName)) {        all.add(person);        person = null;      }      flag = null;    }  }}

4. 进行单元测试

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="org.lxh.activity"   android:versionCode="1"   android:versionName="1.0">  <application android:icon="@drawable/icon" android:label="@string/app_name">    <uses-library android:name="android.test.runner"/>    <activity android:name=".SaxParseXmlActivity"         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:name="android.test.InstrumentationTestRunner"  android:targetPackage="org.lxh.activity" android:label="TestforMyApp"/>  <uses-sdk android:minSdkVersion="8" /></manifest>

package org.lxh.activity;import java.io.InputStream;import java.util.Iterator;import java.util.List;import org.lxh.impl.Parse;import org.lxh.vo.Person;import android.test.AndroidTestCase;import android.util.Log;public class Test extends AndroidTestCase{  public static final String tag="Test"; public void testShuchu() throws Throwable{   //Log.i(tag, "123");   Parse p=new Parse();   InputStream in=getClass().getClassLoader().getResourceAsStream("persons.xml");    List<Person> all=p.findAll(in);     Log.i(tag, String.valueOf(all.size()));    Iterator<Person> it=all.iterator();    while(it.hasNext()){      Person person=it.next();      Log.i(tag, person.toString());    } }}

最后来看一下运行效果图，这里最好弄个filter，控制台就没那么乱了。