Java获取yahoo天气预报

学习闲暇之余，写了个获取yahoo天气预报的java小程序，仅供娱乐。

首先我们需要获取您需要查询城市对应的代号，我们可以用HashMap来查询，代码如下：

publicstatic HashMap<String, String> cityCode =new HashMap<String, String>();

/* 初始化城市代号 */privatevoid initCitys() {    cityCode.put("北京", "0008");    cityCode.put("天津", "0133");    cityCode.put("武汉", "0138");    cityCode.put("杭州", "0044");    cityCode.put("合肥 ", "0448");    cityCode.put("上海 ", "0116");    cityCode.put("福州 ", "0031");    cityCode.put("重庆 ", "0017");    cityCode.put("南昌 ", "0097");    cityCode.put("香港 ", "0049");    cityCode.put("济南 ", "0064");    cityCode.put("澳门 ", "0512");    cityCode.put("郑州 ", "0165");    cityCode.put("呼和浩特 ", "0249");    cityCode.put("乌鲁木齐 ", "0135");    cityCode.put("长沙 ", "0013");    cityCode.put("银川 ", "0259");    cityCode.put("广州 ", "0037");    cityCode.put("拉萨 ", "0080");    cityCode.put("海口 ", "0502");    cityCode.put("南京 ", "0100");    cityCode.put("成都 ", "0016");    cityCode.put("石家庄 ", "0122");    cityCode.put("贵阳 ", "0039");    cityCode.put("太原 ", "0129");    cityCode.put("昆明 ", "0076");    cityCode.put("沈阳 ", "0119");    cityCode.put("西安 ", "0141");    cityCode.put("长春 ", "0010");    cityCode.put("兰州 ", "0079");    cityCode.put("西宁 ", "0236");}

接下来我们要创建链接，以获取天气预报的XML文档

private Document getWeatherXML(String cityCode) throws IOException {        URL url =new URL("http://weather.yahooapis.com/forecastrss?p=CHXX"+ cityCode +"&u=c");        URLConnection connection = url.openConnection();        Document Doc = stringToElement(connection.getInputStream());return Doc;    }

您也可以选择保存获取的天气XML文档

/* 保存获取的天气信息XML文档 */privatevoid saveXML(Document Doc, String Path) {        TransformerFactory transFactory = TransformerFactory.newInstance();        Transformer transformer;try {            transformer = transFactory.newTransformer();            DOMSource domSource =new DOMSource(Doc);            File file =new File(Path);            FileOutputStream out =new FileOutputStream(file);            StreamResult xmlResult =new StreamResult(out);            transformer.transform(domSource, xmlResult);        } catch (Exception e) {            System.out.println("保存文件出错！");        }    }

本人获取的一份XML保存如下

<?xml version="1.0" encoding="UTF-8" ?> - <rss xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" version="2.0">- <channel><title>Yahoo! Weather - Wuhan, CH</title> <link>http://us.rd.yahoo.com/dailynews/rss/weather/Wuhan__CH/*http://weather.yahoo.com/forecast/CHXX0138_c.html</link> <description>Yahoo! Weather for Wuhan, CH</description> <language>en-us</language> <lastBuildDate>Sat, 27 Mar 2010 11:00 pm CST</lastBuildDate> <ttl>60</ttl> <yweather:location city="Wuhan" country="CH" region=""/> <yweather:units distance="km" pressure="mb" speed="km/h" temperature="C"/> <yweather:wind chill="15" direction="110" speed="6.44"/> <yweather:atmosphere humidity="67" pressure="1015.92" rising="0" visibility="9.99"/> <yweather:astronomy sunrise="6:19 am" sunset="6:38 pm"/> - <image><title>Yahoo! Weather</title> <width>142</width> <height>18</height> <link>http://weather.yahoo.com</link> <url>http://l.yimg.com/a/i/us/nws/th/main_142b.gif</url> </image>- <item><title>Conditions for Wuhan, CH at 11:00 pm CST</title> <geo:lat>30.58</geo:lat> <geo:long>114.27</geo:long> <link>http://us.rd.yahoo.com/dailynews/rss/weather/Wuhan__CH/*http://weather.yahoo.com/forecast/CHXX0138_c.html</link> <pubDate>Sat, 27 Mar 2010 11:00 pm CST</pubDate> <yweather:condition code="33" date="Sat, 27 Mar 2010 11:00 pm CST" temp="15" text="Fair"/> - <description>- <!--[CDATA[ <img src="http://l.yimg.com/a/i/us/we/52/33.gif" mce_src="http://l.yimg.com/a/i/us/we/52/33.gif"/><br /><b>Current Conditions:</b><br />Fair, 15 C<BR /><BR /><b>Forecast:</b><BR />Sat - Partly Cloudy. High: 18 Low: 9<br />Sun - Partly Cloudy. High: 20 Low: 12<br /><br /><a href="http://us.rd.yahoo.com/dailynews/rss/weather/Wuhan__CH/*http://weather.yahoo.com/forecast/CHXX0138_c.html" mce_href="http://us.rd.yahoo.com/dailynews/rss/weather/Wuhan__CH/*http://weather.yahoo.com/forecast/CHXX0138_c.html">Full Forecast at Yahoo! Weather</a><BR/><BR/>(provided by <a href="http://www.weather.com" mce_href="http://www.weather.com" >The Weather Channel</a>)<br/>

  ]]--> </description><yweather:forecast code="29" date="27 Mar 2010" day="Sat" high="18" low="9" text="Partly Cloudy"/> <yweather:forecast code="30" date="28 Mar 2010" day="Sun" high="20" low="12" text="Partly Cloudy"/> <guid isPermaLink="false">CHXX0138_2010_03_27_23_00_CST</guid> </item></channel></rss>- <!--  api7.weather.sp1.yahoo.com uncompressed/chunked Sat Mar 27 08:43:16 PDT 2010 -->

好啦，下面就是解析XML了，您看一下XML文档，如果您了解的话很容易获取其中的信息

/* 获取天气信息 */public String getWeather(String city) {        String result =null;try {            Document doc = getWeatherXML(GetWeatherInfo.cityCode.get(city));            NodeList nodeList = doc.getElementsByTagName("channel");for (int i =0; i < nodeList.getLength(); i++) {                Node node = nodeList.item(i);                NodeList nodeList1 = node.getChildNodes();for (int j =0; j < nodeList1.getLength(); j++) {                    Node node1 = nodeList1.item(j);if (node1.getNodeName().equalsIgnoreCase("item")) {                        NodeList nodeList2 = node1.getChildNodes();for (int k =0; k < nodeList2.getLength(); k++) {                            Node node2 = nodeList2.item(k);if (node2.getNodeName().equalsIgnoreCase("yweather:forecast")) {                                NamedNodeMap nodeMap = node2.getAttributes();                                Node lowNode = nodeMap.getNamedItem("low");                                Node highNode = nodeMap.getNamedItem("high");                                Node codeNode = nodeMap.getNamedItem("code");                                String day ="今天";if (result ==null) {                                    result ="";                                } else {                                    day ="\n明天";                                }                                result = result+ day+""+ dictionaryStrings[Integer                                                .parseInt(codeNode                                                        .getNodeValue())]+"\t最低温度："+ lowNode.getNodeValue()+"℃ \t最高温度："+ highNode.getNodeValue()+"℃ ";                            }                        }                    }                }            }            saveXML(doc, "C:\\Users\\ygui\\Desktop\\Weather.xml");        } catch (Exception e) {            e.printStackTrace();        }return result;    }

整个程序的代码如下：

package stwolf.hustbaidu.java.learn.filelist;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.net.URLConnection;import java.util.HashMap;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Document;import org.w3c.dom.NamedNodeMap;import org.w3c.dom.Node;import org.w3c.dom.NodeList;class GetWeatherInfo {publicstatic HashMap<String, String> cityCode =new HashMap<String, String>();privatefinal String[] dictionaryStrings = { "龙卷风", "热带风暴", "飓风", "强雷阵雨","雷阵雨", "小雨加雪", "雨加冰雹", "雪加冰雹", "冰雨", "毛毛雨", "冻雨", "阵雨", "阵雨", "小雪","零星小雪", "高吹雪", "雪", "冰雹", "雨夹雪", "尘", "雾", "薄雾", "多烟的", "大风", "有风","寒冷", "阴天", "夜间阴天", "白天阴天", "夜间多云", "白天多云", "夜间清亮", "晴朗", "转晴","转晴", "雨夹冰雹", "热", "雷阵雨", "雷阵雨", "雷阵雨", "雷阵雨", "大雪", "阵雪", "大雪","多云", "雷", "阵雪", "雷雨" };public GetWeatherInfo() {        initCitys();    }/* 初始化城市代号 */privatevoid initCitys() {        cityCode.put("北京", "0008");        cityCode.put("天津", "0133");        cityCode.put("武汉", "0138");        cityCode.put("杭州", "0044");        cityCode.put("合肥 ", "0448");        cityCode.put("上海 ", "0116");        cityCode.put("福州 ", "0031");        cityCode.put("重庆 ", "0017");        cityCode.put("南昌 ", "0097");        cityCode.put("香港 ", "0049");        cityCode.put("济南 ", "0064");        cityCode.put("澳门 ", "0512");        cityCode.put("郑州 ", "0165");        cityCode.put("呼和浩特 ", "0249");        cityCode.put("乌鲁木齐 ", "0135");        cityCode.put("长沙 ", "0013");        cityCode.put("银川 ", "0259");        cityCode.put("广州 ", "0037");        cityCode.put("拉萨 ", "0080");        cityCode.put("海口 ", "0502");        cityCode.put("南京 ", "0100");        cityCode.put("成都 ", "0016");        cityCode.put("石家庄 ", "0122");        cityCode.put("贵阳 ", "0039");        cityCode.put("太原 ", "0129");        cityCode.put("昆明 ", "0076");        cityCode.put("沈阳 ", "0119");        cityCode.put("西安 ", "0141");        cityCode.put("长春 ", "0010");        cityCode.put("兰州 ", "0079");        cityCode.put("西宁 ", "0236");    }private Document getWeatherXML(String cityCode) throws IOException {        URL url =new URL("http://weather.yahooapis.com/forecastrss?p=CHXX"+ cityCode +"&u=c");        URLConnection connection = url.openConnection();        Document Doc = stringToElement(connection.getInputStream());return Doc;    }/* 保存获取的天气信息XML文档 */privatevoid saveXML(Document Doc, String Path) {        TransformerFactory transFactory = TransformerFactory.newInstance();        Transformer transformer;try {            transformer = transFactory.newTransformer();            DOMSource domSource =new DOMSource(Doc);            File file =new File(Path);            FileOutputStream out =new FileOutputStream(file);            StreamResult xmlResult =new StreamResult(out);            transformer.transform(domSource, xmlResult);        } catch (Exception e) {            System.out.println("保存文件出错！");        }    }/* 获取天气信息 */public String getWeather(String city) {        String result =null;try {            Document doc = getWeatherXML(GetWeatherInfo.cityCode.get(city));            NodeList nodeList = doc.getElementsByTagName("channel");for (int i =0; i < nodeList.getLength(); i++) {                Node node = nodeList.item(i);                NodeList nodeList1 = node.getChildNodes();for (int j =0; j < nodeList1.getLength(); j++) {                    Node node1 = nodeList1.item(j);if (node1.getNodeName().equalsIgnoreCase("item")) {                        NodeList nodeList2 = node1.getChildNodes();for (int k =0; k < nodeList2.getLength(); k++) {                            Node node2 = nodeList2.item(k);if (node2.getNodeName().equalsIgnoreCase("yweather:forecast")) {                                NamedNodeMap nodeMap = node2.getAttributes();                                Node lowNode = nodeMap.getNamedItem("low");                                Node highNode = nodeMap.getNamedItem("high");                                Node codeNode = nodeMap.getNamedItem("code");                                String day ="今天";if (result ==null) {                                    result ="";                                } else {                                    day ="\n明天";                                }                                result = result+ day+""+ dictionaryStrings[Integer                                                .parseInt(codeNode                                                        .getNodeValue())]+"\t最低温度："+ lowNode.getNodeValue()+"℃ \t最高温度："+ highNode.getNodeValue()+"℃ ";                            }                        }                    }                }            }            saveXML(doc, "C:\\Users\\ygui\\Desktop\\Weather.xml");        } catch (Exception e) {            e.printStackTrace();        }return result;    }public Document stringToElement(InputStream input) {try {            DocumentBuilder db = DocumentBuilderFactory.newInstance()                    .newDocumentBuilder();            Document doc = db.parse(input);return doc;        } catch (Exception e) {returnnull;        }    }}publicclass Test {publicstaticvoid main(String arg[]) {        GetWeatherInfo info =new GetWeatherInfo();        String weather = info.getWeather("武汉");        System.out.println(weather);    }}

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