JAVA通过API获取天气预报信息(HTTP协议)

超、凢脫俗 2022-07-13 12:29 503阅读 0赞

public class GetWeather { 
        public static void main(String[] args) {
            String httpUrl = "http://apis.baidu.com/apistore/weatherservice/citylist";
            String httpArg = "cityname=%E6%9C%9D%E9%98%B3";
            String jsonResult = request(httpUrl, httpArg);
            System.out.println(unicode2String(jsonResult));
        }
    
        /** * @param urlAll * :请求接口 * @param httpArg * :参数 * @return 返回结果 */
        public static String request(String httpUrl, String httpArg) {
            BufferedReader reader = null;
            String result = null;
            StringBuffer sbf = new StringBuffer();
            httpUrl = httpUrl + "?" + httpArg;
    
            try {
                URL url = new URL(httpUrl);
                HttpURLConnection connection = (HttpURLConnection) url
                        .openConnection();
                connection.setRequestMethod("GET");
                // 填入apikey到HTTP header
                connection.setRequestProperty("apikey",  "92b9ce55bfdc6d18aff38a18cd286b8d");
                connection.connect();
    
                InputStream is = connection.getInputStream();
                reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                String strRead = null;
                while ((strRead = reader.readLine()) != null) {
                    sbf.append(strRead);
                    sbf.append("\r\n");
                }
                reader.close();
                result = sbf.toString();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return result;
        }
        //将返回的中文字符的编码（乱码）处理一下，转换成正确的中文
        public static String unicode2String(String str){
            int indexU=0;
            StringBuffer result=new StringBuffer();
            char t;
            indexU=str.indexOf("\\u");
            while(indexU>=0){
                result.append(str.substring(0,indexU));
                t=(char)Integer.parseInt(str.substring(indexU+2,indexU+6),16);
                result.append(t);
                str=str.substring(indexU+6);
                indexU=str.indexOf("\\u");
            }
            return result.toString();
        }
    }