使用天气api接口调用

聚合数据官网https://www.juhe.cn/

个人认证以后申请天气api（有免费的测试接口，每天可以请求100次数据）

返回的数据时json格式，需要有自己的APPKEY,(Key在个人中心我的接口)

需要在maven中导入

        <dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier></dependency>

下面是java代码示例：

package com.jian8.juc.test;import net.sf.json.JSONObject;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;public class JuheDemo {public static final String DEF_CHATSET = "UTF-8";public static final int DEF_CONN_TIMEOUT = 30000;public static final int DEF_READ_TIMEOUT = 30000;public static String userAgent =  "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";//配置您申请的KEYpublic static final String APPKEY ="这里写的是你自己的APPKEY";//1.根据城市查询天气public static void getRequest1(){String result =null;String url ="http://op.juhe.cn/onebox/weather/query";//请求接口地址Map params = new HashMap();//请求参数params.put("cityname","上海");//要查询的城市，如：温州、上海、北京params.put("key",APPKEY);//应用APPKEY(应用详细页查询)params.put("dtype","json");//返回数据的格式,xml或json，默认jsontry {result =net(url, params, "GET");JSONObject object = JSONObject.fromObject(result);if(object.getInt("error_code")==0){System.out.println(object.get("result"));}else{System.out.println(object.get("error_code")+":"+object.get("reason"));}} catch (Exception e) {e.printStackTrace();}}/**** @param strUrl 请求地址* @param params 请求参数* @param method 请求方法* @return  网络请求字符串* @throws Exception*/public static String net(String strUrl, Map params,String method) throws Exception {HttpURLConnection conn = null;BufferedReader reader = null;String rs = null;try {StringBuffer sb = new StringBuffer();if(method==null || method.equals("GET")){strUrl = strUrl+"?"+urlencode(params);}URL url = new URL(strUrl);conn = (HttpURLConnection) url.openConnection();if(method==null || method.equals("GET")){conn.setRequestMethod("GET");}else{conn.setRequestMethod("POST");conn.setDoOutput(true);}conn.setRequestProperty("User-agent", userAgent);conn.setUseCaches(false);conn.setConnectTimeout(DEF_CONN_TIMEOUT);conn.setReadTimeout(DEF_READ_TIMEOUT);conn.setInstanceFollowRedirects(false);conn.connect();if (params!= null && method.equals("POST")) {try {DataOutputStream out = new DataOutputStream(conn.getOutputStream());out.writeBytes(urlencode(params));} catch (Exception e) {e.printStackTrace();}}InputStream is = conn.getInputStream();reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));String strRead = null;while ((strRead = reader.readLine()) != null) {sb.append(strRead);}rs = sb.toString();} catch (IOException e) {e.printStackTrace();} finally {if (reader != null) {reader.close();}if (conn != null) {conn.disconnect();}}return rs;}//将map型转为请求参数型public static String urlencode(Map<String,String> data) {StringBuilder sb = new StringBuilder();for (Map.Entry i : data.entrySet()) {try {sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}return sb.toString();}public static void main(String[] args) {getRequest1();}}

返回的数据：

{"data": {"realtime": {"city_code": "101020100","city_name": "上海","date": "2019-10-18","time": "11:00:00","week": "5","moon": "九月二十","dataUptime": 1571366649,"weather": {"temperature": "20","humidity": "58","info": "多云","img": "01"},"wind": {"direct": "东风","power": "3级","offset": "","windspeed": ""}},"life": {"date": "2019-10-18","info": {"kongtiao": ["较少开启", "您将感到很舒适，一般不需要开启空调。"],"guomin": ["易发", "天气条件易诱发过敏，风力较大，易过敏人群应减少外出，外出穿长衣长裤并佩戴好眼镜和口罩，外出归来时及时清洁手和口鼻，注意防风。"],"shushidu": ["舒适", "白天不太热也不太冷，风力不大，相信您在这样的天气条件下，应会感到比较清爽和舒适。"],"chuanyi": ["较舒适", "建议着薄外套、开衫牛仔衫裤等服装。年老体弱者应适当添加衣物，宜着夹克衫、薄毛衣等。"],"diaoyu": ["较适宜", "较适合垂钓，但风力稍大，会对垂钓产生一定的影响。"],"ganmao": ["较易发", "虽然温度适宜但风力较大，仍较易发生感冒，体质较弱的朋友请注意适当防护。"],"ziwaixian": ["弱", "紫外线强度较弱，建议出门前涂擦SPF在12-15之间、PA+的防晒护肤品。"],"xiche": ["较不宜", "较不宜洗车，未来一天无雨，风力较大，如果执意擦洗汽车，要做好蒙上污垢的心理准备。"],"yundong": ["较适宜", "天气较好，但因风力稍强，户外可选择对风力要求不高的运动，推荐您进行室内运动。"],"daisan": ["不带伞", "天气较好，不会降水，因此您可放心出门，无须带雨伞。"]}},"weather": [{"date": "2019-10-18","info": {"dawn": ["1", "多云", "17", "持续无风向", "3-5级", "17:22"],"day": ["1", "多云", "23", "北风", "微风", "05:57"],"night": ["0", "晴", "16", "北风", "微风", "17:21"]},"week": "五","nongli": "九月二十"}, {"date": "2019-10-19","info": {"dawn": ["0", "晴", "16", "北风", "微风", "17:21"],"day": ["1", "多云", "22", "北风", "微风", "05:58"],"night": ["1", "多云", "16", "北风", "微风", "17:19"]},"week": "六","nongli": "九月廿一"}, {"date": "2019-10-20","info": {"dawn": ["1", "多云", "16", "北风", "微风", "17:19"],"day": ["1", "多云", "24", "东北风", "微风", "05:59"],"night": ["1", "多云", "17", "东北风", "微风", "17:18"]},"week": "日","nongli": "九月廿二"}, {"date": "2019-10-21","info": {"dawn": ["1", "多云", "17", "东北风", "微风", "17:18"],"day": ["1", "多云", "24", "东北风", "3-5级", "06:00"],"night": ["1", "多云", "17", "北风", "微风", "17:17"]},"week": "一","nongli": "九月廿三"}, {"date": "2019-10-22","info": {"dawn": ["1", "多云", "17", "北风", "微风", "17:17"],"day": ["2", "阴", "24", "东北风", "3-5级", "06:00"],"night": ["1", "多云", "18", "东北风", "微风", "17:16"]},"week": "二","nongli": "九月廿四"}],"f3h": {"temperature": [{"jg": "20191018110000","jb": "20"}, {"jg": "20191018140000","jb": "22"}, {"jg": "20191018170000","jb": "21"}, {"jg": "20191018200000","jb": "18"}, {"jg": "20191018230000","jb": "17"}, {"jg": "20191019020000","jb": "16"}, {"jg": "20191019050000","jb": "16"}, {"jg": "20191019080000","jb": "19"}, {"jg": "20191019110000","jb": "22"}],"precipitation": [{"jg": "20191018110000","jf": "0"}, {"jg": "20191018140000","jf": "0"}, {"jg": "20191018170000","jf": "0"}, {"jg": "20191018200000","jf": "0"}, {"jg": "20191018230000","jf": "0"}, {"jg": "20191019020000","jf": "0"}, {"jg": "20191019050000","jf": "0"}, {"jg": "20191019080000","jf": "0"}, {"jg": "20191019110000","jf": "0"}]},"pm25": {"pm25": {"level": 1,"quality": "优","des": "空气很棒，快出门呼吸新鲜空气吧。","curPm": "27","pm25": "14","pm10": "27","pub_time": 1571364000,"city_code": "101020100"},"cityName": "上海","key": "上海","dateTime": "2019年10月18日10时"},"jingqu": "","jingqutq": "","date": "","isForeign": "0","partner": {"title_word": "全国","show_url": "tianqi.so.com","base_url": "http://www.so.com/link?url=http%3A%2F%2Ftianqi.so.com%2Fweather%2F101020100&q=&ts=1571367923&t=d7abf88290b9a8a1b2421cfc278333b"}}
}

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