Yahoo Service實(shí)現(xiàn)天氣預(yù)報(bào)的實(shí)例代碼分享
下面提供給分享學(xué)習(xí)的關(guān)于Yahoo Service實(shí)現(xiàn)天氣預(yù)報(bào)的實(shí)例代碼,希望能夠給大家?guī)?lái)幫助或啟發(fā)。
天氣預(yù)報(bào)是非常有用的服務(wù),如果能在網(wǎng)站上集成天氣預(yù)報(bào),能極大地方便用戶查詢。
尋遍了國(guó)內(nèi)所有的氣象站點(diǎn),沒(méi)找見(jiàn)提供Web服務(wù)的,太小氣了,只能去國(guó)外找。NOAA(www.weather.gov)提供一個(gè)Web服務(wù),但是死活連不上服務(wù)器,估計(jì)被屏蔽了,其他提供全球天氣預(yù)報(bào)的有www.weather.com和yahoo,
不過(guò)weather.com的服務(wù)太麻煩,還需要注冊(cè),相比之下,yahoo的天氣服務(wù)既簡(jiǎn)單又快速,只需一個(gè)http請(qǐng)求,然后解析返回的XML即可獲得天氣預(yù)報(bào)。
以北京為例,在weather.yahoo.com查找北京的城市代碼為CHXX0008,對(duì)應(yīng)的URL為:
http://xml.weather.yahoo.com/forecastrss?u=c&p=CHXX0008
然后,通過(guò)SAX解析返回的XML:
URL url = new URL("http://xml.weather.yahoo.com/forecastrss?u=c&p=CHXX0008");
InputStream input = url.openStream();
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
parser = factory.newSAXParser();
parser.parse(input, new YahooHandler());
自己定義一個(gè)YahooHandler來(lái)響應(yīng)SAX事件:
/**
* For more information, please visit: http://www.crackj2ee.com
* Author: Liao Xuefeng
*/
public class YahooHandler extends DefaultHandler {
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
if("yweather:condition".equals(qName)) {
String s_date = attributes.getValue(3);
try {
Date publish = new SimpleDateFormat("EEE, dd MMM yyyy hh:mm a z",
Locale.US).parse(s_date);
//System.out.println("Publish: " + publish.toString());
}
catch (Exception e) {
e.printStackTrace();
throw new SAXException("Cannot parse date: " + s_date);
}
}
else if("yweather:forecast".equals(qName)) {
String s_date = attributes.getValue(1);
Date date = null;
try {
date = new SimpleDateFormat("dd MMM yyyy", Locale.US).parse(s_date);
}
catch (Exception e) {
e.printStackTrace();
throw new SAXException("Cannot parse date: " + s_date);
}
int low = Integer.parseInt(attributes.getValue(2));
int high = Integer.parseInt(attributes.getValue(3));
String text = attributes.getValue(4);
int code = Integer.parseInt(attributes.getValue(5));
System.out.println("Weather: "+ text + ", low=" + low + ", high=" + high);
}
super.startElement(uri, localName, qName, attributes);
}
}
運(yùn)行結(jié)果:
Weather: Partly Cloudy, low=7, high=16
Weather: Sunny, low=7, high=20
Yahoo會(huì)返回當(dāng)天和第二天的Weather預(yù)報(bào)。