Question

我多次尝试解码由嵌套数组组成的嵌套JSON字符串，我用GSON()来做。并且它有效，但问题是关于这个数组中的对象不能从json解码，所以我想要你的帮助：

JSON字符串：

{ "data" : { "current_condition" : [ { "cloudcover" : "75",
            "humidity" : "87",
            "observation_time" : "03:16 AM",
            "precipMM" : "1.5",
            "pressure" : "991",
            "temp_C" : "11",
            "temp_F" : "52",
            "visibility" : "7",
            "weatherCode" : "293",
            "weatherDesc" : [ { "value" : "Patchy light rain" } ],
            "weatherIconUrl" : [ { "value" : "http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0033_cloudy_with_light_rain_night.png" } ],
            "winddir16Point" : "SSW",
            "winddirDegree" : "210",
            "windspeedKmph" : "30",
            "windspeedMiles" : "19"
          } ],
      "request" : [ { "query" : "London, United Kingdom",
            "type" : "City"
          } ],
      "weather" : [ { "date" : "2014-01-03",
            "precipMM" : "6.9",
            "tempMaxC" : "10",
            "tempMaxF" : "50",
            "tempMinC" : "5",
            "tempMinF" : "41",
            "weatherCode" : "293",
            "weatherDesc" : [ { "value" : "Patchy light rain" } ],
            "weatherIconUrl" : [ { "value" : "http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0017_cloudy_with_light_rain.png" } ],
            "winddir16Point" : "SW",
            "winddirDegree" : "220",
            "winddirection" : "SW",
            "windspeedKmph" : "33",
            "windspeedMiles" : "21"
          } ]
    } }

我的代码解码这个JSON：

HashMap HashMap = new Gson().fromJson(json, HashMap.class);

及其输出：

{data = {request = [{query = London，United Kingdom，type = City}]， current_condition = [{cloudcover = 75，湿度= 87，观察时间= 03:16 AM，precipMM = 1.5，压力= 991，temp_C = 11，temp_F = 52，能见度= 7， weatherCode = 293，weatherDesc = [{value = Patchy light rain}]， weatherIconUrl = [{值= http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0033_cloudy_with_light_rain_night.png}]， winddir16Point = SSW，winddirDegree = 210，windspeedKmph = 30， windspeedMiles = 19}]，weather = [{date = 2014-01-03，precipMM = 6.9， tempMaxC = 10，tempMaxF = 50，tempMinC = 5，tempMinF = 41，weatherCode = 293， weatherDesc = [{value = Patchy light rain}]， weatherIconUrl = [{值= http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0017_cloudy_with_light_rain.png}]， winddir16Point = SW，winddirDegree = 220，winddirection = SW， windspeedKmph = 33，windspeedMiles = 21}]}}

所以我想要一个理想的方法让我能够输入这个嵌套的HashMap数组及其值，因为我的方法不能让我能够从这个数组中调用嵌套值

谢谢，

Answer 1

因为字符串代表另一个Hashmap中的Hashmap，你可以使用像

这样的东西

HashMap<String, HashMap> hashMap = new Gson().fromJson(json, HashMap.class);

Answer 2

在我使用这种方法之后它才有效：

Type type = new TypeToken< HashMap<String, HashMap<String, ArrayList<com.google.gson.internal.LinkedTreeMap>>>>() {}.getType();

HashMap<String, HashMap<String, ArrayList<com.google.gson.internal.LinkedTreeMap>>> hashMap = new Gson().fromJson(API.getJSON(), type);    

com.google.gson.internal.LinkedTreeMap hash = hashMap.get("data").get("current_condition").get(0);

System.out.println("    "+hash.get("humidity")+"      ");

我知道你的答案和我的第一种方法都是正确的，但正如我告诉你的那样，我想进入这个Json里面的条目嵌套数组列表

如何解码这个嵌套的JSON字符串？

2 个答案: