1、开明接口
天气预报接口服务应用的聚合数据提供的收费接口，每天能够100次收费调用。能够通过https://www.juhe.cn/docs/api/id/73注册及开明。
2、通过Java发动城市天气查问
package cn.juhe;import net.sf.json.JSONObject;import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.nio.charset.StandardCharsets;import java.util.HashMap;import java.util.Map;public class SimpleWeather {// 天气情况查问接口地址public static String API_URL = "http://apis.juhe.cn/simpleWeather/query";// 接口申请Keypublic static String API_KEY = "xxxxxxxxxxxxxx";public static void main(String[] args) { String cityName = "北京"; queryWeather(cityName);}/** * 依据城市名查问天气情况 * * @param cityName */public static void queryWeather(String cityName) { Map<String, Object> params = new HashMap<>();//组合参数 params.put("city", cityName); params.put("key", API_KEY); String queryParams = urlencode(params); String response = doGet(API_URL, queryParams); try { JSONObject jsonObject = JSONObject.fromObject(response); int error_code = jsonObject.getInt("error_code"); if (error_code == 0) { System.out.println("调用接口胜利"); JSONObject result = jsonObject.getJSONObject("result"); JSONObject realtime = result.getJSONObject("realtime"); System.out.printf("城市：%s%n", result.getString("city")); System.out.printf("天气：%s%n", realtime.getString("info")); System.out.printf("温度：%s%n", realtime.getString("temperature")); System.out.printf("湿度：%s%n", realtime.getString("humidity")); System.out.printf("风向：%s%n", realtime.getString("direct")); System.out.printf("风力：%s%n", realtime.getString("power")); System.out.printf("空气质量：%s%n", realtime.getString("aqi")); } else { System.out.println("调用接口失败：" + jsonObject.getString("reason")); } } catch (Exception e) { e.printStackTrace(); }}/** * get形式的http申请 * * @param httpUrl 申请地址 * @return 返回后果 */public static String doGet(String httpUrl, String queryParams) { HttpURLConnection connection = null; InputStream inputStream = null; BufferedReader bufferedReader = null; String result = null;// 返回后果字符串 try { // 创立近程url连贯对象 URL url = new URL(new StringBuffer(httpUrl).append("?").append(queryParams).toString()); // 通过近程url连贯对象关上一个连贯，强转成httpURLConnection类 connection = (HttpURLConnection) url.openConnection(); // 设置连贯形式：get connection.setRequestMethod("GET"); // 设置连贯主机服务器的超时工夫：15000毫秒 connection.setConnectTimeout(5000); // 设置读取近程返回的数据工夫：60000毫秒 connection.setReadTimeout(6000); // 发送申请 connection.connect(); // 通过connection连贯，获取输出流 if (connection.getResponseCode() == 200) { inputStream = connection.getInputStream(); // 封装输出流，并指定字符集 bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8)); // 存放数据 StringBuilder sbf = new StringBuilder(); String temp; while ((temp = bufferedReader.readLine()) != null) { sbf.append(temp); sbf.append(System.getProperty("line.separator")); } result = sbf.toString(); } } catch (IOException e) { e.printStackTrace(); } finally { // 敞开资源 if (null != bufferedReader) { try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != inputStream) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } if (connection != null) { connection.disconnect();// 敞开近程连贯 } } return result;}/** * 将map型转为申请参数型 * * @param data * @return */public static String urlencode(Map<String, ?> data) { StringBuilder sb = new StringBuilder(); for (Map.Entry<String, ?> i : data.entrySet()) { try { sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue() + "", "UTF-8")).append("&"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } String result = sb.toString(); result = result.substring(0, result.lastIndexOf("&")); return result;}}