json解析—Gson以及GsonFormat插件的运用

最近开始慢慢做毕业设计了，遇到一个功能是获取天气预报的，我选择的是和风天气的api，返回的是JSON数据，所以遇到了解析JSON的问题

首先简单说下JSON，JSON（JavaScript Object Notation）是一种轻量级的数据交换格式。用于数据转化传输，通用于PHP、Java、C++、C#、Python等编程语言的数据交换传输

在解析框架中，我选择了使用Gson，Gson是Google公司开发的一个开源框架，用于Java对象和JSON数据之间的相互转化。

Gson的下载地址：

https://github.com/google/gson

将包导入idea

Gson的使用：

//new一个Gson对象
Gson gson = new Gson();
//将json字符串转为bean对象
Hewind hewind = gson.fromJson(response,Hewind.class);

上面第四行代码中，调用了fromJson方法，第一个参数为json字符串，第二个参数是根据json建立的JavaBean

简单的实体类花花时间还是能完成的，但面对这样的数据就有点困难了

{"HeWeather6":[{"basic":{"cid":"CN101210301","location":"嘉兴","parent_city":"嘉兴","admin_area":"浙江","cnty":"中国","lat":"30.76265335","lon":"120.75086212","tz":"+8.0"},"update":{"loc":"2017-11-22 19:52","utc":"2017-11-22 11:52"},"status":"ok","now":{"cloud":"0","cond_code":"101","cond_txt":"多云","fl":"9","hum":"65","pcpn":"0","pres":"1023","tmp":"11","vis":"10","wind_deg":"339","wind_dir":"西北风","wind_sc":"微风","wind_spd":"7"},"daily_forecast":[{"cond_code_d":"305","cond_code_n":"100","cond_txt_d":"小雨","cond_txt_n":"晴","date":"2017-11-22","hum":"72","mr":"09:21","ms":"20:00","pcpn":"0.1","pop":"69","pres":"1024","sr":"06:29","ss":"16:58","tmp_max":"13","tmp_min":"5","uv_index":"4","vis":"9","wind_deg":"298","wind_dir":"西北风","wind_sc":"微风","wind_spd":"8"},{"cond_code_d":"100","cond_code_n":"100","cond_txt_d":"晴","cond_txt_n":"晴","date":"2017-11-23","hum":"48","mr":"10:07","ms":"20:50","pcpn":"0.0","pop":"0","pres":"1027","sr":"06:30","ss":"16:58","tmp_max":"12","tmp_min":"3","uv_index":"4","vis":"10","wind_deg":"271","wind_dir":"西风","wind_sc":"微风","wind_spd":"14"},{"cond_code_d":"100","cond_code_n":"101","cond_txt_d":"晴","cond_txt_n":"多云","date":"2017-11-24","hum":"44","mr":"10:51","ms":"21:42","pcpn":"0.0","pop":"0","pres":"1027","sr":"06:31","ss":"16:58","tmp_max":"13","tmp_min":"4","uv_index":"4","vis":"10","wind_deg":"177","wind_dir":"南风","wind_sc":"微风","wind_spd":"12"}],"hourly":[{"cloud":"55","cond_code":"101","cond_txt":"多云","dew":"5.4","hum":"78","pop":"0","pres":"1026","time":"2017-11-22 22:00","tmp":"8","wind_deg":"331","wind_dir":"西北风","wind_sc":"微风","wind_spd":"11"},{"cloud":"37","cond_code":"104","cond_txt":"阴","dew":"3.8","hum":"76","pop":"0","pres":"1027","time":"2017-11-23 01:00","tmp":"6","wind_deg":"341","wind_dir":"西北风","wind_sc":"微风","wind_spd":"11"},{"cloud":"16","cond_code":"103","cond_txt":"晴间多云","dew":"0.9","hum":"67","pop":"0","pres":"1027","time":"2017-11-23 04:00","tmp":"6","wind_deg":"338","wind_dir":"西北风","wind_sc":"微风","wind_spd":"11"},{"cloud":"3","cond_code":"103","cond_txt":"晴间多云","dew":"-1.3","hum":"60","pop":"0","pres":"1029","time":"2017-11-23 07:00","tmp":"6","wind_deg":"337","wind_dir":"西北风","wind_sc":"微风","wind_spd":"13"},{"cloud":"0","cond_code":"103","cond_txt":"晴间多云","dew":"-3.4","hum":"39","pop":"0","pres":"1029","time":"2017-11-23 10:00","tmp":"6","wind_deg":"338","wind_dir":"西北风","wind_sc":"微风","wind_spd":"15"},{"cloud":"0","cond_code":"103","cond_txt":"晴间多云","dew":"-7.7","hum":"26","pop":"0","pres":"1027","time":"2017-11-23 13:00","tmp":"10","wind_deg":"330","wind_dir":"西北风","wind_sc":"微风","wind_spd":"14"},{"cloud":"0","cond_code":"103","cond_txt":"晴间多云","dew":"-3.1","hum":"44","pop":"0","pres":"1026","time":"2017-11-23 16:00","tmp":"10","wind_deg":"308","wind_dir":"西北风","wind_sc":"微风","wind_spd":"9"},{"cloud":"1","cond_code":"103","cond_txt":"晴间多云","dew":"-1.4","hum":"63","pop":"0","pres":"1027","time":"2017-11-23 19:00","tmp":"7","wind_deg":"276","wind_dir":"西风","wind_sc":"微风","wind_spd":"6"}],"lifestyle":[{"brf":"较舒适","txt":"今天夜间虽然天气晴好，但会感觉偏凉，舒适、宜人。","type":"comf"},{"brf":"较冷","txt":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。","type":"drsg"},{"brf":"较易发","txt":"天凉，昼夜温差较大，较易发生感冒，请适当增减衣服，体质较弱的朋友请注意适当防护。","type":"flu"},{"brf":"较适宜","txt":"天气较好，但考虑风力较强且气温较低，推荐您进行室内运动，若在户外运动注意防风并适当增减衣物。","type":"sport"},{"brf":"适宜","txt":"天气较好，风稍大，但温度适宜，是个好天气哦。适宜旅游，您可以尽情地享受大自然的无限风光。","type":"trav"},{"brf":"中等","txt":"属中等强度紫外线辐射天气，外出时建议涂擦SPF高于15、PA+的防晒护肤品，戴帽子、太阳镜。","type":"uv"},{"brf":"较适宜","txt":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。","type":"cw"},{"brf":"良","txt":"气象条件有利于空气污染物稀释、扩散和清除，可在室外正常活动。","type":"air"}]}]}

这个时候就用到了GsonFormat插件

安装方法：

安装后重启idea即可使用

使用方法：

使用快捷键 alt+s / alt+insert

把json数据粘贴进去，点击OK，JavaBean就自动生成啦

当然Gson的功能和使用方法不仅仅只有这些，我也只是初步接触，等我继续慢慢摸索