关于api:Java-聚合数据API接口调用城市天气预报

点击进入【数据聚合_数据接口调用_开发者数据API开放平台】（官网）

在pom文件中，退出依赖

        <dependency>            <groupId>net.sf.json-lib</groupId>            <artifactId>json-lib</artifactId>            <version>2.2.3</version>            <classifier>jdk15</classifier>        </dependency>

SimpleWeather.java

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Key    public static String API_KEY = "108f91d439908e5d2da86cc8881dd3db";    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;    }}

启动程序，呈现如下成果

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原文链接：https://blog.csdn.net/CSDN_ja...