Android学习笔记——SAX解析XML

XML数据源：

<?xml version="1.0" encoding="utf-8"?><WeatherWindow>    <updated>2015-09-08 20:00:00</updated>    <region><![CDATA[上海]]></region>    <today>        <condition><![CDATA[晴转多云]]></condition>        <temphigh>29</temphigh>        <templow>22</templow>        <image_url><![CDATA[http://media.lily.tvxio.com/icons/duoyun.png]]></image_url>    </today>    <tomorrow>        <condition><![CDATA[多云]]></condition>        <temphigh>29</temphigh>        <templow>29</templow>        <image_url><![CDATA[http://media.lily.tvxio.com/icons/duoyun.png]]></image_url>    </tomorrow></WeatherWindow>

定义实体类：

package tv.ismar.daisy.data.weather;

/** * Created by <huaijiefeng@gmail.com> on 9/15/14. */public class WeatherEntity {    private String updated;    private String region;

   private WeatherDetail today;    private WeatherDetail tomorrow;

   public String getUpdated() {        return updated;    }

   public void setUpdated(String updated) {        this.updated = updated;    }

   public String getRegion() {        return region;    }

   public void setRegion(String region) {        this.region = region;    }

   public WeatherDetail getToday() {        return today;    }

   public void setToday(WeatherDetail today) {        this.today = today;    }

   public WeatherDetail getTomorrow() {        return tomorrow;    }

   public void setTomorrow(WeatherDetail tomorrow) {        this.tomorrow = tomorrow;    }

   public static class WeatherDetail {

       private String condition;        private String temphigh;        private String templow;        private String image_url;

       public String getCondition() {            return condition;        }

       public void setCondition(String condition) {            this.condition = condition;        }

       public String getTemphigh() {            return temphigh;        }

       public void setTemphigh(String temphigh) {            this.temphigh = temphigh;        }

       public String getTemplow() {            return templow;        }

       public void setTemplow(String templow) {            this.templow = templow;        }

       public String getImage_url() {            return image_url;        }

       public void setImage_url(String image_url) {            this.image_url = image_url;        }

   }}

解析XML：

package tv.ismar.daisy.core.weather;

import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import tv.ismar.daisy.data.weather.WeatherEntity;

/** * Created by huaijie on 9/15/15. */public class WeatherInfoHandler extends DefaultHandler {

   private final int TODAY = 5;    private final int TOMORROW = 6;

   private final int UPDATED = 7;    private final int REGION = 8;

   private final int CONDITION = 1;    private final int TEMPHIGH = 2;    private final int TEMPLOW = 3;    private final int IMAGE_URL = 4;

   private int flg = 0;

   private WeatherEntity weatherEntity;    private WeatherEntity.WeatherDetail weatherDetail;

   public WeatherEntity getWeatherEntity() {        return weatherEntity;    }

   @Override    public void startDocument() throws SAXException {        weatherEntity = new WeatherEntity();    }

   @Override    public void endDocument() throws SAXException {        super.endDocument();    }

   @Override    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {        if (localName.equals("WeatherWindow")) {            flg = 0;            return;        }

       if (localName.equals("updated")) {            flg = UPDATED;            return;        }

       if (localName.equals("region")) {            flg = REGION;            return;        }

       if (localName.equals("today")) {            weatherDetail = new WeatherEntity.WeatherDetail();            flg = TODAY;            return;        }

       if (localName.equals("tomorrow")) {            weatherDetail = new WeatherEntity.WeatherDetail();            flg = TOMORROW;            return;        }

       if (localName.equals("condition")) {            flg = CONDITION;            return;        }

       if (localName.equals("temphigh")) {            flg = TEMPHIGH;            return;        }

       if (localName.equals("templow")) {            flg = TEMPLOW;            return;        }

       if (localName.equals("image_url")) {            flg = IMAGE_URL;            return;        }

   }

   @Override    public void endElement(String uri, String localName, String qName) throws SAXException {        if (localName.equals("today")) {            weatherEntity.setToday(weatherDetail);            weatherDetail = null;            return;        }

       if (localName.equals("tomorrow")) {            weatherEntity.setTomorrow(weatherDetail);            weatherDetail = null;            return;        }    }

   @Override    public void characters(char[] ch, int start, int length) throws SAXException {        String str = new String(ch, start, length);

       switch (flg) {            case UPDATED:                weatherEntity.setUpdated(str);                break;            case REGION:                weatherEntity.setRegion(str);                break;            case CONDITION:                weatherDetail.setCondition(str);                break;            case TEMPHIGH:                weatherDetail.setTemphigh(str);                break;            case TEMPLOW:                weatherDetail.setTemplow(str);                break;            case IMAGE_URL:                weatherDetail.setImage_url(str);                break;            default:                return;        }    }}

运行：

SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();try {    SAXParser saxParser = saxParserFactory.newSAXParser();    XMLReader xmlReader = saxParser.getXMLReader();    WeatherInfoHandler weatherInfoHandler = new WeatherInfoHandler();    xmlReader.setContentHandler(weatherInfoHandler);    InputSource inputSource = new InputSource(new StringReader(result));    xmlReader.parse(inputSource);

   WeatherEntity weatherEntity = weatherInfoHandler.getWeatherEntity();

   Log.i(TAG, "update: " + weatherEntity.getUpdated() + " region: " + weatherEntity.getRegion());    Log.i(TAG, "today condition: " + weatherEntity.getToday().getCondition());    Log.i(TAG, "today temphigh: " + weatherEntity.getToday().getTemphigh());    Log.i(TAG, "today templow: " + weatherEntity.getToday().getTemplow());    Log.i(TAG, "today image_url: " + weatherEntity.getToday().getImage_url());

   Log.i(TAG, "tomorrow condition: " + weatherEntity.getTomorrow().getCondition());    Log.i(TAG, "tomorrow temphigh: " + weatherEntity.getTomorrow().getTemphigh());    Log.i(TAG, "tomorrow templow: " + weatherEntity.getTomorrow().getTemplow());    Log.i(TAG, "tomorrow image_url: " + weatherEntity.getTomorrow().getImage_url());

   todayWeatherTemperature.setText(weatherEntity.getToday().getTemplow() + "℃ ~ " + weatherEntity.getToday().getTemphigh() + "℃");    todayWeatherInfo.setText(weatherEntity.getToday().getCondition());    Picasso.with(mContext).load(weatherEntity.getToday().getImage_url()).into(todayWeatherIcon1);

   tomorrowWeatherTemperature.setText(weatherEntity.getTomorrow().getTemplow() + "℃ ~ " + weatherEntity.getTomorrow().getTemphigh() + "℃");    tomorrowWeatherInfo.setText(weatherEntity.getTomorrow().getCondition());    Picasso.with(mContext).load(weatherEntity.getToday().getImage_url()).into(tomorrowWeatherIcon1);

} catch (ParserConfigurationException e) {    e.printStackTrace();} catch (SAXException e) {    e.printStackTrace();} catch (IOException e) {    e.printStackTrace();}