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step1：
需要导入httpClient包，import 'dart:convert';
import 'dart:io';
step2：
获取天气数据
void getWeatherData() async{
try {
var httpClient = new HttpClient();
var httpClientRequest = await httpClient.getUrl(Uri.parse("http://t.weather.sojson.com/api/weather/city/101030100"));
var httpClientResponse = await httpClientRequest.close();
var result = await httpClientResponse.transform(utf8.decoder).join();
print(result);
httpClient.close();
} catch (e) {
print("请求失败:$e");
} finally {}
}
step3：
程序请求地址时，服务器正常返回数据，则状态码为200。
控制台返回结果如下：
{"time":"2019-03-18 19:00:00","cityInfo":{"city":"天津市","cityId":"101030100","parent":"天津","updateTime":"18:32"},"date":"20190318","message":"Success !","status":200,"data":{"shidu":"32%","pm25":116.0,"pm10":143.0,"quality":"中度污染","wendu":"20","ganmao":"儿童、老年人及心脏、呼吸系统疾病患者人群应减少长时间或高强度户外锻炼，一般人群适量减少户外运动","yesterday":{"date":"17","sunrise":"06:23","high":"高温 19.0℃","low":"低温 8.0℃","sunset":"18:19","aqi":107.0,"ymd":"2019-03-17","week":"星期日","fx":"南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},"forecast":[{"date":"18","sunrise":"06:21","high":"高温 21.0℃","low":"低温 11.0℃","sunset":"18:20","aqi":147.0,"ymd":"2019-03-18","week":"星期一","fx":"西南风","fl":"3-4级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"19","sunrise":"06:19","high":"高温 26.0℃","low":"低温 12.0℃","sunset":"18:21","aqi":116.0,"ymd":"2019-03-19","week":"星期二","fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"20","sunrise":"06:18","high":"高温 15.0℃","low":"低温 8.0℃","sunset":"18:22","aqi":112.0,"ymd":"2019-03-20","week":"星期三","fx":"东风","fl":"4-5级","type":"阴","notice":"不要被阴云遮挡住好心情"},{"date":"21","sunrise":"06:16","high":"高温 14.0℃","low":"低温 4.0℃","sunset":"18:23","aqi":42.0,"ymd":"2019-03-21","week":"星期四","fx":"西北风","fl":"5-6级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"22","sunrise":"06:15","high":"高温 15.0℃","low":"低温 4.0℃","sunset":"18:24","aqi":38.0,"ymd":"2019-03-22","week":"星期五","fx":"西风","fl":"4-5级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"23","sunrise":"06:13","high":"高温 16.0℃","low":"低温 6.0℃","sunset":"18:25","aqi":26.0,"ymd":"2019-03-23","week":"星期六","fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"24","sunrise":"06:12","high":"高温 17.0℃","low":"低温 6.0℃","sunset":"18:26","ymd":"2019-03-24","week":"星期日","fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"25","sunrise":"06:10","high":"高温 19.0℃","low":"低温 7.0℃","sunset":"18:27","ymd":"2019-03-25","week":"星期一","fx":"西北风","fl":"4-5级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"26","sunrise":"06:08","high":"高温 18.0℃","low":"低温 6.0℃","sunset":"18:28","ymd":"2019-03-26","week":"星期二","fx":"北风","fl":"4-5级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"27","sunrise":"06:07","high":"高温 17.0℃","low":"低温 8.0℃","sunset":"18:29","ymd":"2019-03-27","week":"星期三","fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"28","sunrise":"06:05","high":"高温 21.0℃","low":"低温 7.0℃","sunset":"18:30","ymd":"2019-03-28","week":"星期四","fx":"北风","fl":"3-4级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"29","sunrise":"06:04","high":"高温 14.0℃","low":"低温 4.0℃","sunset":"18:31","ymd":"2019-03-29","week":"星期五","fx":"西北风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"30","sunrise":"06:02","high":"高温 14.0℃","low":"低温 6.0℃","sunset":"18:32","ymd":"2019-03-30","week":"星期六","fx":"西风","fl":"<3级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"31","sunrise":"06:01","high":"高温 17.0℃","low":"低温 7.0℃","sunset":"18:33","ymd":"2019-03-31","week":"星期日","fx":"西风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"01","sunrise":"05:59","high":"高温 18.0℃","low":"低温 8.0℃","sunset":"18:34","ymd":"2019-04-01","week":"星期一","fx":"西南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"}]}}
返回的是JSON格式的数据，后续需要JSON解析
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