天气预报服务

本文介绍一下利用国家气象网免费的数据接口抓取3天的天气数据并展示

中国气象网的的网址

http://www.weather.com.cn/

想要用气象网的免费数据首先要去他们那申请一个授权，13年之前都是完全免费的14年才开始要授权，但是还是可以不花钱可以用来学习研究

提供一个他们的官方群具体信息可以问他们的工作人员  QQ群：337438189

在申请完授权之后就可以用他提供的appid 和key去取数据了，返回的数据是json格式的

{"c":{"c1":"101010100","c2":"beijing","c3":"北京","c4":"beijing","c5":"北京","c6":"beijing","c7":"北京","c8":"china","c9":"中国","c10":"1","c11":"010","c12":"100000","c13":"116.407526","c14":"39.904030","c15":"33","c16":"AZ9010","c17":"+8"},"f":{"f1":[{"fa":"09","fb":"03","fc":"23","fd":"18","fe":"0","ff":"0","fg":"0","fh":"0","fi":"05:43|18:45"},{"fa":"01","fb":"00","fc":"27","fd":"17","fe":"0","ff":"0","fg":"0","fh":"0","fi":"05:43|18:43"},{"fa":"00","fb":"00","fc":"29","fd":"18","fe":"0","ff":"0","fg":"0","fh":"0","fi":"05:44|18:42"}],"f0":"201409020800"}}

这个就是他们返回的json串，具体这些字母代表什么有一个说明文档

0分下载

http://download.csdn.net/detail/zhouyu7373/7852959

现在说一下拿到授权之后具体怎么操作

第一步：要用appid和key值算出地址，代码如下需要base64的加密包，可以去阿帕奇官网下载

public static byte[] getSignature(String data, String key) throws Exception {byte[] keyBytes = key.getBytes("UTF-8");SecretKeySpec signingKey = new SecretKeySpec(keyBytes, HMAC_SHA1);Mac mac = Mac.getInstance(HMAC_SHA1);mac.init(signingKey);byte[] rawHmac = mac.doFinal(data.getBytes("UTF-8"));return rawHmac;}public static String getURL(String cityCode) {String url = "http://webapi.weather.com.cn/data/?areaid=%s&type=%s&date=%s&appid=%s";String fullUrl = "http://webapi.weather.com.cn/data/?areaid=%s&type=%s&date=%s&appid=%s&key=%s";String areaId = "这里需要一个城市的编号，就是被搜索的城市";String appId = "这里输入自己的ID，好像每天都访问次数的我就不公布我的了";String privateKey = "这里是key，我也不写我的了";String dateString = new SimpleDateFormat("yyyyMMddHHmm").format(new Date());String typeString = "forecast3d";String keyUrl = String.format(url, new Object[] { areaId, typeString,dateString, appId });String requestUrl = "";try {String keyString = java.net.URLEncoder.encode(Base64.encodeBase64String(getSignature(keyUrl,privateKey)), "UTF-8");requestUrl = String.format(fullUrl, new Object[] { areaId,typeString, dateString, appId.substring(0, 6), keyString });System.out.println(requestUrl);//这里输出的就是地址，可以直接敲到浏览器上访问} catch (Exception e) {}return requestUrl;}

控制台输出的地址直接敲到浏览器上就可以看到json串了，我提供一下气象网的城市编码

http://download.csdn.net/detail/zhouyu7373/7853067

这个包里分省、市、县三个级别，根据个人需要使用就行，三个级别是分成3个表的，同样是0分下载，只为分享

我把我解析json的方法也分享给大家，写的不好不要见怪。根据不同的需求取自己需要的数据，不必纠结我取的东西是什么

package ;import java.io.IOException;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.HashSet;import java.util.List;import java.util.Map;import java.util.Set;import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.commons.codec.binary.Base64;import com.taiji.egis.server.util.DateUtil;import com.taiji.egis.server.util.GeneralMethod;import com.taiji.egis.server.util.HttpConnectUtil;import com.taiji.egis.server.ws.weather.mapper.WeatherMapper;import com.taiji.egis.server.ws.weather.model.City;import com.taiji.egis.server.ws.weather.model.Weather;import com.taiji.egis.server.ws.weather.service.WeatherService;/** *  * 天气预报更新服务实现类 *  * @author zhouyu * @date 20130517 */public class WeatherServiceRest2Impl implements WeatherService {<span style="white-space:pre"></span>// private Logger logger = Logger.getLogger(WeatherServiceRest2Impl.class);<span style="white-space:pre"></span>private static final String HMAC_SHA1 = "HmacSHA1";<span style="white-space:pre"></span>private WeatherMapper weatherDao = null;<span style="white-space:pre"></span>public void setWeatherDao(WeatherMapper weatherDao) {<span style="white-space:pre"></span>this.weatherDao = weatherDao;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>private List<City> errorCtiy = new ArrayList<City>();<span style="white-space:pre"></span>private int flag = 0;<span style="white-space:pre"></span>private int verson = 0;<span style="white-space:pre"></span><span style="white-space:pre"></span>//private static Set<String> vaneSet = new HashSet<String>();<span style="white-space:pre"></span>private static HashMap<String, String> windMap = new HashMap<String, String>();<span style="white-space:pre"></span><span style="white-space:pre"></span>static {<span style="white-space:pre"></span>windMap.put("0","微风");<span style="white-space:pre"></span>windMap.put("1","东北风");<span style="white-space:pre"></span>windMap.put("2","东风");<span style="white-space:pre"></span>windMap.put("3","东南风");<span style="white-space:pre"></span>windMap.put("4","南风");<span style="white-space:pre"></span>windMap.put("5","西南风");<span style="white-space:pre"></span>windMap.put("6","西风");<span style="white-space:pre"></span>windMap.put("7","西北风");<span style="white-space:pre"></span>windMap.put("8","北风");<span style="white-space:pre"></span>windMap.put("9","旋转风");<span style="white-space:pre"></span><span style="white-space:pre"></span>}<span style="white-space:pre"></span><span style="white-space:pre"></span>private static HashMap<String, String> speedMap = new HashMap<String, String>();<span style="white-space:pre"></span><span style="white-space:pre"></span>static{<span style="white-space:pre"></span>speedMap.put("0", "小于3级");<span style="white-space:pre"></span>speedMap.put("1", "3-4级");<span style="white-space:pre"></span>speedMap.put("2", "4-5级");<span style="white-space:pre"></span>speedMap.put("3", "5-6级");<span style="white-space:pre"></span>speedMap.put("4", "6-7级");<span style="white-space:pre"></span>speedMap.put("5", "7-8级");<span style="white-space:pre"></span>speedMap.put("6", "8-9级");<span style="white-space:pre"></span>speedMap.put("7", "9-10级");<span style="white-space:pre"></span>speedMap.put("8", "10-11级");<span style="white-space:pre"></span>speedMap.put("9", "11-12级");<span style="white-space:pre"></span>}<span style="white-space:pre"></span>@Override<span style="white-space:pre"></span>public void getLatestCityWeathers() {<span style="white-space:pre"></span>List<City> cities = new ArrayList<City>();<span style="white-space:pre"></span>if (weatherDao != null) {<span style="white-space:pre"></span>if (errorCtiy.size() == 0) {<span style="white-space:pre"></span>verson = weatherDao.getDBVersion();<span style="white-space:pre"></span>cities = weatherDao.selectWeatherCitys();<span style="white-space:pre"></span>} else if (errorCtiy.size() > 0 && flag == 0) {<span style="white-space:pre"></span>flag += 100;<span style="white-space:pre"></span>cities = errorCtiy;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if (cities != null && cities.size() > 0) {<span style="white-space:pre"></span>System.out.println("------------"<span style="white-space:pre"></span>+ DateUtil.getNowDateTimeStr() + "：准备更新 "<span style="white-space:pre"></span>+ cities.size() + " 个城市的天气预报信息----------");<span style="white-space:pre"></span>int validCities = 0; // 计数器，用于记录获取天气预报信息成功的城市数<span style="white-space:pre"></span>List<Weather> weathers = new ArrayList<Weather>();<span style="white-space:pre"></span>for (City city : cities) {<span style="white-space:pre"></span>System.out.println("------------开始获取 【"<span style="white-space:pre"></span>+ city.getCityName() + "】   最近3天的天气预报信息.");<span style="white-space:pre"></span>try {<span style="white-space:pre"></span>List<Weather> cityWeatherList = (ArrayList<Weather>) getWeathersByCity(city);<span style="white-space:pre"></span>if (cityWeatherList != null<span style="white-space:pre"></span>&& cityWeatherList.size() > 0) {<span style="white-space:pre"></span>Map<String, Object> map = new HashMap<String, Object>();<span style="white-space:pre"></span>map.put("dbVersion", verson);<span style="white-space:pre"></span>map.put("list", cityWeatherList);<span style="white-space:pre"></span>int test = weatherDao.batchInsertCityWeatherRest(map);<span style="white-space:pre"></span>System.out.println("当前版本号"+verson +",插入返回的int值："+test);<span style="white-space:pre"></span>validCities++;<span style="white-space:pre"></span>} else {<span style="white-space:pre"></span>System.out.println("------------获取【"<span style="white-space:pre"></span>+ city.getCityName()<span style="white-space:pre"></span>+ "】   天气预报信息失败，没有有效的天气预报数据.");<span style="white-space:pre"></span>}<span style="white-space:pre"></span>} catch (Exception e) {<span style="white-space:pre"></span>e.printStackTrace();<span style="white-space:pre"></span>System.out.println("------------获取 【"<span style="white-space:pre"></span>+ city.getCityName()<span style="white-space:pre"></span>+ "】   最近3天的天气预报信息时发生错误，该城市被忽略.");<span style="white-space:pre"></span>continue;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>System.out.println("------------实际获取 到 " + validCities<span style="white-space:pre"></span>+ " 个城市,共计 " + weathers.size() + " 条记录，写入数据库.");<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>if (errorCtiy.size() > 0 && flag == 0) {<span style="white-space:pre"></span>getLatestCityWeathers();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>}<span style="white-space:pre"></span>private List<Weather> getWeathersByCity(City city) {<span style="white-space:pre"></span>SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");<span style="white-space:pre"></span>String result = "";<span style="white-space:pre"></span>JSONArray weatherArray = null;<span style="white-space:pre"></span>String db_update = "";<span style="white-space:pre"></span>JSONObject cityInfo = null;<span style="white-space:pre"></span>List<Weather> weatherList = new ArrayList<Weather>();<span style="white-space:pre"></span>try {<span style="white-space:pre"></span>result = HttpConnectUtil.doGetConnection(getURL(city.getCityCode()));<span style="white-space:pre"></span>JSONObject resultObject = JSONObject.fromObject(result);<span style="white-space:pre"></span>cityInfo = resultObject.getJSONObject("c");<span style="white-space:pre"></span>weatherArray = resultObject.getJSONObject("f")<span style="white-space:pre"></span>.getJSONArray("f1");<span style="white-space:pre"></span>db_update = resultObject.getJSONObject("f").getString("f0")<span style="white-space:pre"></span>.substring(0, 8);<span style="white-space:pre"></span>db_update = db_update.substring(0, 4) + "-"<span style="white-space:pre"></span>+ db_update.substring(4, 6) + "-"<span style="white-space:pre"></span>+ db_update.substring(6, 8);<span style="white-space:pre"></span>} catch (Exception e) {<span style="white-space:pre"></span>e.printStackTrace();<span style="white-space:pre"></span>errorCtiy.add(city);<span style="white-space:pre"></span>return weatherList;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>for (int i = 0; i < 3; i++) {<span style="white-space:pre"></span>JSONObject weatherInfo = weatherArray.getJSONObject(i);<span style="white-space:pre"></span>Weather wea = new Weather();<span style="white-space:pre"></span>String cityName = cityInfo.getString("c3");<span style="white-space:pre"></span>System.out.println("气象网的城市名："+ cityName +"数据库中的城市名："+city.getCityName());<span style="white-space:pre"></span>String weather1 = weatherCast(weatherInfo.getString("fa"));<span style="white-space:pre"></span>String weather2 = weatherCast(weatherInfo.getString("fb"));<span style="white-space:pre"></span>int temperature1 = weatherInfo.getInt("fc");<span style="white-space:pre"></span>int temperature2 = weatherInfo.getInt("fd");<span style="white-space:pre"></span>String wind1 = windMap.get(weatherInfo.getString("fe"));<span style="white-space:pre"></span>String wind2 = windMap.get(weatherInfo.getString("ff"));<span style="white-space:pre"></span>String speed1 = speedMap.get(weatherInfo.getString("fg"));<span style="white-space:pre"></span>String speed2 = speedMap.get(weatherInfo.getString("fh"));<span style="white-space:pre"></span>String img1 = weatherInfo.getString("fa");<span style="white-space:pre"></span>String img2 = weatherInfo.getString("fb");<span style="white-space:pre"></span>wea.setId(GeneralMethod.getUUIDStr());<span style="white-space:pre"></span>wea.setCityName(city.getCityName());<span style="white-space:pre"></span>wea.setForetime(24 * i);<span style="white-space:pre"></span>wea.setWeather1(weather1);<span style="white-space:pre"></span>wea.setWeather2(weather2);<span style="white-space:pre"></span>wea.setTemperature1(temperature1);<span style="white-space:pre"></span>wea.setTemperature2(temperature2);<span style="white-space:pre"></span>wea.setVane1(wind1);<span style="white-space:pre"></span>wea.setVane2(wind2);<span style="white-space:pre"></span>wea.setSpeed1(speed1);<span style="white-space:pre"></span>wea.setSpeed2(speed2);<span style="white-space:pre"></span>wea.setImgSrc1(img1);<span style="white-space:pre"></span>wea.setImgSrc2(img2);<span style="white-space:pre"></span>wea.setCityId(city.getCode());<span style="white-space:pre"></span>wea.setDbUpdate(db_update);<span style="white-space:pre"></span>wea.setUpdateTime(DateUtil.getNowDateTimeStr());<span style="white-space:pre"></span>try {<span style="white-space:pre"></span>String str = db_update.replace("年", "-");<span style="white-space:pre"></span>str = str.replace("月", "-");<span style="white-space:pre"></span>str = str.replace("日", "");<span style="white-space:pre"></span>Date dateTime = sdf.parse(str);<span style="white-space:pre"></span>dateTime.setDate(dateTime.getDate() + i - 1);<span style="white-space:pre"></span>wea.setDateTime(dateTime);<span style="white-space:pre"></span>} catch (ParseException e) {<span style="white-space:pre"></span>e.printStackTrace();<span style="white-space:pre"></span>}<span style="white-space:pre"></span>weatherList.add(wea);<span style="white-space:pre"></span>}<span style="white-space:pre"></span>return weatherList;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public static byte[] getSignature(String data, String key) throws Exception {<span style="white-space:pre"></span>byte[] keyBytes = key.getBytes("UTF-8");<span style="white-space:pre"></span>SecretKeySpec signingKey = new SecretKeySpec(keyBytes, HMAC_SHA1);<span style="white-space:pre"></span>Mac mac = Mac.getInstance(HMAC_SHA1);<span style="white-space:pre"></span>mac.init(signingKey);<span style="white-space:pre"></span>byte[] rawHmac = mac.doFinal(data.getBytes("UTF-8"));<span style="white-space:pre"></span>return rawHmac;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public static String getURL(String cityCode) {<span style="white-space:pre"></span>String url = "http://webapi.weather.com.cn/data/?areaid=%s&type=%s&date=%s&appid=%s";<span style="white-space:pre"></span>String fullUrl = "http://webapi.weather.com.cn/data/?areaid=%s&type=%s&date=%s&appid=%s&key=%s";<span style="white-space:pre"></span>String areaId = cityCode;<span style="white-space:pre"></span>String appId = "<span style="font-family: Arial, Helvetica, sans-serif;">填自己的</span>";<span style="white-space:pre"></span>String privateKey = "<span style="font-family: Arial, Helvetica, sans-serif;">填自己的</span>";<span style="white-space:pre"></span>String dateString = new SimpleDateFormat("yyyyMMddHHmm")<span style="white-space:pre"></span>.format(new Date());<span style="white-space:pre"></span>String typeString = "forecast3d";<span style="white-space:pre"></span>String keyUrl = String.format(url, new Object[] { areaId, typeString,<span style="white-space:pre"></span>dateString, appId });<span style="white-space:pre"></span>String requestUrl = "";<span style="white-space:pre"></span>try {<span style="white-space:pre"></span>String keyString = java.net.URLEncoder<span style="white-space:pre"></span>.encode(Base64.encodeBase64String(getSignature(keyUrl,<span style="white-space:pre"></span>privateKey)), "UTF-8");<span style="white-space:pre"></span>requestUrl = String.format(fullUrl, new Object[] { areaId,<span style="white-space:pre"></span>typeString, dateString, appId.substring(0, 6), keyString });<span style="white-space:pre"></span>System.out.println(requestUrl);<span style="white-space:pre"></span>} catch (Exception e) {<span style="white-space:pre"></span>}<span style="white-space:pre"></span>return requestUrl;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>public static String weatherCast(String weather) {<span style="white-space:pre"></span>int i = Integer.parseInt(weather);<span style="white-space:pre"></span>String result = "";<span style="white-space:pre"></span>switch (i) {<span style="white-space:pre"></span>case 0:<span style="white-space:pre"></span>result = "晴";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 1:<span style="white-space:pre"></span>result = "多云";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 2:<span style="white-space:pre"></span>result = "阴";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 3:<span style="white-space:pre"></span>result = "阵雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 4:<span style="white-space:pre"></span>result = "雷阵雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 5:<span style="white-space:pre"></span>result = "雷阵雨伴有冰雹";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 6:<span style="white-space:pre"></span>result = "雨夹雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 7:<span style="white-space:pre"></span>result = "小雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 8:<span style="white-space:pre"></span>result = "中雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 9:<span style="white-space:pre"></span>result = "大雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 10:<span style="white-space:pre"></span>result = "暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 11:<span style="white-space:pre"></span>result = "大暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 12:<span style="white-space:pre"></span>result = "特大暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 13:<span style="white-space:pre"></span>result = "阵雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 14:<span style="white-space:pre"></span>result = "小雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 15:<span style="white-space:pre"></span>result = "中雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 16:<span style="white-space:pre"></span>result = "大雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 17:<span style="white-space:pre"></span>result = "暴雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 18:<span style="white-space:pre"></span>result = "雾";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 19:<span style="white-space:pre"></span>result = "冻雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 20:<span style="white-space:pre"></span>result = "沙尘暴";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 21:<span style="white-space:pre"></span>result = "小到中雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 22:<span style="white-space:pre"></span>result = "中到大雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 23:<span style="white-space:pre"></span>result = "大到暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 24:<span style="white-space:pre"></span>result = "暴雨到大暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 25:<span style="white-space:pre"></span>result = "大暴雨到特大暴雨";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 26:<span style="white-space:pre"></span>result = "小到中雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 27:<span style="white-space:pre"></span>result = "中到大雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 28:<span style="white-space:pre"></span>result = "大到暴雪";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 29:<span style="white-space:pre"></span>result = "浮沉";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 30:<span style="white-space:pre"></span>result = "扬沙";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 31:<span style="white-space:pre"></span>result = "强沙尘暴";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 53:<span style="white-space:pre"></span>result = "霾";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>case 99:<span style="white-space:pre"></span>result = "无";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>default:<span style="white-space:pre"></span>result = "无";<span style="white-space:pre"></span>break;<span style="white-space:pre"></span>}<span style="white-space:pre"></span>return result;<span style="white-space:pre"></span>}}