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();
}