Android SAX解析实例教程

　SAX（simpleAPIforXML）是一种XML解析的替代方法。相比于DOM，SAX是一种速度更快，更有效的方法。它逐行扫描文档，一边扫描一边解析。而且相比于DOM，SAX可以在解析文档的任意时刻停止解析，但任何事物都有其相反的一面，对于SAX来说就是操作复杂。
　　下面对resources.xml文件进行解析
　　1、源文件如下
<resources>
        <resource>
               <mp3.name>kong</mp3.name>
                <mp3.author>侧田</mp3.author>
        </resource>
        <resource>
               <mp3.name>蚂蚁</mp3.name>
                <mp3.author>古巨基</mp3.author>
        </resource>
</resources>


　　2、创建Mp3Info.java实体bean类
package cn.m9;

public class Mp3Info {
private String mp3Name;
private String author;
public Mp3Info() {
}
public Mp3Info(String mp3Name, String author) {
  super();
  this.mp3Name = mp3Name;
  this.author = author;
}
public String getMp3Name() {
  return mp3Name;
}
public void setMp3Name(String mp3Name) {
  this.mp3Name = mp3Name;
}
public String getAuthor() {
  return author;
}
public void setAuthor(String author) {
  this.author = author;
}
@Override
public String toString() {
  return "Mp3Info [author=" + author + ", mp3Name=" + mp3Name + "]";
}
}

　　3、创建Mp3ListContentHandler.java类，继承DefaultHandler类
package cn.m9;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class Mp3ListContentHandler extends DefaultHandler {
private Mp3Info mp3Info = null;
private List<Mp3Info> mp3Infos = null;
private String tagName = null;
public Mp3ListContentHandler() {
  super();
}
public Mp3ListContentHandler(List<Mp3Info> mp3Infos) {
  super();
  this.mp3Infos = mp3Infos;
}
public List<Mp3Info> getMp3Infos() {
  return mp3Infos;
}
public void setMp3Infos(List<Mp3Info> mp3Infos) {
  this.mp3Infos = mp3Infos;
}
@Override
public void startDocument() throws SAXException {
  // TODO Auto-generated method stub
  super.startDocument();
}
@Override
public void startElement(String uri, String localName, String qName,
   Attributes attributes) throws SAXException {
  // TODO Auto-generated method stub
  tagName = localName;
  if (tagName.equals("resource")) {
   mp3Info = new Mp3Info();
  }
}
@Override
public void characters(char[] ch, int start, int length)
   throws SAXException {
  // TODO Auto-generated method stub
  String tmp = new String(ch, start, length);
  if (tagName.equals("mp3.name")) {
   mp3Info.setMp3Name(tmp);
  } else if (tagName.equals("mp3.author")) {
   mp3Info.setAuthor(tmp);
  }
}
@Override
public void endDocument() throws SAXException {
  // TODO Auto-generated method stub
  super.endDocument();
}
@Override
public void endElement(String uri, String localName, String qName)
   throws SAXException {
  // TODO Auto-generated method stub
  tagName = localName;
  if (tagName.equals("resource")) {
   mp3Infos.add(mp3Info);
  }
  tagName = "";
}
}


　　4、创建TestSAXActivity.java类
package cn.m9;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;
public class TestSAXActivity extends Activity {
/** Called when the activity is first created. */
private String xml = "<resources><resource><mp3.name>kong</mp3.name><mp3.author>侧田</mp3.author></resource><resource><mp3.name>蚂蚁</mp3.name><mp3.author>古巨基</mp3.author></resource></resources>";
private LinearLayout layout = null;
private TextView tv = null;
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  layout = (LinearLayout) this.findViewById(R.id.main);
  List<Mp3Info> infos = parseXml(xml);
  String text = null;
  for (Iterator i = infos.iterator(); i.hasNext();) {
   Mp3Info mp3 = (Mp3Info) i.next();
   text = "" + mp3.getMp3Name() + "                演唱："
     + mp3.getAuthor();
   tv = new TextView(this);
   tv.setText(text);
   tv.setWidth(500);
   tv.setTextSize(20);
   layout.addView(tv);
  }
}
public List<Mp3Info> parseXml(String xmlStr) {
  // 创建SAXParserFactory解析器工厂
  SAXParserFactory parserFactory = SAXParserFactory.newInstance();
  List<Mp3Info> mp3Infos = null;
  Mp3Info mp3Info = null;
  try {
   // 创建XMLReader对象，xml文件解析器
   XMLReader xmlReader = parserFactory.newSAXParser().getXMLReader();
   mp3Infos = new ArrayList<Mp3Info>();
   // 注册内容事件处理器（设置xml文件解析器的解析方式）
   xmlReader.setContentHandler(new Mp3ListContentHandler(mp3Infos));
   // 开始解析xml格式文件
   xmlReader.parse(new InputSource(new StringReader(xmlStr)));
   for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {
    mp3Info = (Mp3Info) mp3Infos.iterator();
   }
   mp3Infos.add(mp3Info);
  } catch (Exception e) {
   e.printStackTrace();
  }
  return mp3Infos;
}
}

效果图：