如何从 JSON 嵌套数组中检索值？

【问题标题】：How to retrieve values from JSON nested array?如何从 JSON 嵌套数组中检索值？
【发布时间】：2013-01-16 18:33:46
【问题描述】：

我在我的 Android 应用程序中使用 this link。而且我必须从地址组件 JSON 数组中检索长名称键的值。

以下是 JSON 结构：

     {
   "results":[
      {
         "address_components":[
            {
               "long_name":"285",
               "short_name":"285",
               "types":[
                  "street_number"
               ]
            },
            {
               "long_name":"Bedford Avenue",
               "short_name":"Bedford Ave",
               "types":[
                  "route"
               ]
            },
            {
               "long_name":"Williamsburg",
               "short_name":"Williamsburg",
               "types":[
                  "neighborhood",
                  "political"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"New York",
               "types":[
                  "locality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            },
            {
               "long_name":"11211",
               "short_name":"11211",
               "types":[
                  "postal_code"
               ]
            }
         ],
         "formatted_address":"285 Bedford Avenue, Brooklyn, NY 11211, USA",
         "geometry":{
            "location":{
               "lat":40.71412890,
               "lng":-73.96140740
            },
            "location_type":"ROOFTOP",
            "viewport":{
               "northeast":{
                  "lat":40.71547788029149,
                  "lng":-73.96005841970849
               },
               "southwest":{
                  "lat":40.71277991970850,
                  "lng":-73.96275638029151
               }
            }
         },
         "types":[
            "street_address"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Grand St - Bedford Av",
               "short_name":"Grand St - Bedford Av",
               "types":[
                  "bus_station",
                  "transit_station",
                  "establishment"
               ]
            },
            {
               "long_name":"Williamsburg",
               "short_name":"Williamsburg",
               "types":[
                  "neighborhood",
                  "political"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            },
            {
               "long_name":"11211",
               "short_name":"11211",
               "types":[
                  "postal_code"
               ]
            }
         ],
         "formatted_address":"Grand St - Bedford Av, Brooklyn, NY 11211, USA",
         "geometry":{
            "location":{
               "lat":40.7143210,
               "lng":-73.9611510
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.71566998029149,
                  "lng":-73.95980201970849
               },
               "southwest":{
                  "lat":40.71297201970850,
                  "lng":-73.96249998029151
               }
            }
         },
         "types":[
            "bus_station",
            "transit_station",
            "establishment"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Grand St - Bedford Av",
               "short_name":"Grand St - Bedford Av",
               "types":[
                  "bus_station",
                  "transit_station",
                  "establishment"
               ]
            },
            {
               "long_name":"Williamsburg",
               "short_name":"Williamsburg",
               "types":[
                  "neighborhood",
                  "political"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            },
            {
               "long_name":"11211",
               "short_name":"11211",
               "types":[
                  "postal_code"
               ]
            }
         ],
         "formatted_address":"Grand St - Bedford Av, Brooklyn, NY 11211, USA",
         "geometry":{
            "location":{
               "lat":40.7146840,
               "lng":-73.9615630
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.71603298029149,
                  "lng":-73.96021401970850
               },
               "southwest":{
                  "lat":40.71333501970850,
                  "lng":-73.96291198029151
               }
            }
         },
         "types":[
            "bus_station",
            "transit_station",
            "establishment"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Bedford Av - Grand St",
               "short_name":"Bedford Av - Grand St",
               "types":[
                  "bus_station",
                  "transit_station",
                  "establishment"
               ]
            },
            {
               "long_name":"Williamsburg",
               "short_name":"Williamsburg",
               "types":[
                  "neighborhood",
                  "political"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            },
            {
               "long_name":"11211",
               "short_name":"11211",
               "types":[
                  "postal_code"
               ]
            }
         ],
         "formatted_address":"Bedford Av - Grand St, Brooklyn, NY 11211, USA",
         "geometry":{
            "location":{
               "lat":40.714710,
               "lng":-73.9609990
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.71605898029150,
                  "lng":-73.95965001970849
               },
               "southwest":{
                  "lat":40.71336101970850,
                  "lng":-73.96234798029150
               }
            }
         },
         "types":[
            "bus_station",
            "transit_station",
            "establishment"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Williamsburg",
               "short_name":"Williamsburg",
               "types":[
                  "neighborhood",
                  "political"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"New York",
               "types":[
                  "locality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"Williamsburg, Brooklyn, NY, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":40.72517730,
                  "lng":-73.9364980
               },
               "southwest":{
                  "lat":40.69793290,
                  "lng":-73.96984499999999
               }
            },
            "location":{
               "lat":40.70644610,
               "lng":-73.95361629999999
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.72517730,
                  "lng":-73.9364980
               },
               "southwest":{
                  "lat":40.69793290,
                  "lng":-73.96984499999999
               }
            }
         },
         "types":[
            "neighborhood",
            "political"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"11211",
               "short_name":"11211",
               "types":[
                  "postal_code"
               ]
            },
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"New York",
               "types":[
                  "locality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"Brooklyn, NY 11211, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":40.72800890,
                  "lng":-73.92072990
               },
               "southwest":{
                  "lat":40.69763590,
                  "lng":-73.97616690
               }
            },
            "location":{
               "lat":40.71800360,
               "lng":-73.96537150000002
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.72800890,
                  "lng":-73.92072990
               },
               "southwest":{
                  "lat":40.69763590,
                  "lng":-73.97616690
               }
            }
         },
         "types":[
            "postal_code"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"Kings, NY, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":40.7394460,
                  "lng":-73.83336509999999
               },
               "southwest":{
                  "lat":40.56956370,
                  "lng":-74.04397190
               }
            },
            "location":{
               "lat":40.65287620,
               "lng":-73.95949399999999
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.7394460,
                  "lng":-73.83336509999999
               },
               "southwest":{
                  "lat":40.56956370,
                  "lng":-74.04397190
               }
            }
         },
         "types":[
            "administrative_area_level_2",
            "political"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"Brooklyn",
               "short_name":"Brooklyn",
               "types":[
                  "sublocality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"New York",
               "types":[
                  "locality",
                  "political"
               ]
            },
            {
               "long_name":"Kings",
               "short_name":"Kings",
               "types":[
                  "administrative_area_level_2",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"Brooklyn, NY, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":40.7394460,
                  "lng":-73.83336509999999
               },
               "southwest":{
                  "lat":40.5510420,
                  "lng":-74.056630
               }
            },
            "location":{
               "lat":40.650,
               "lng":-73.950
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.7394460,
                  "lng":-73.83336509999999
               },
               "southwest":{
                  "lat":40.5510420,
                  "lng":-74.056630
               }
            }
         },
         "types":[
            "sublocality",
            "political"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"New York",
               "short_name":"New York",
               "types":[
                  "locality",
                  "political"
               ]
            },
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"New York, NY, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":40.91524140,
                  "lng":-73.70027209999999
               },
               "southwest":{
                  "lat":40.4959080,
                  "lng":-74.25908790
               }
            },
            "location":{
               "lat":40.71435280,
               "lng":-74.00597309999999
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":40.91524140,
                  "lng":-73.70027209999999
               },
               "southwest":{
                  "lat":40.4959080,
                  "lng":-74.25573489999999
               }
            }
         },
         "types":[
            "locality",
            "political"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"New York",
               "short_name":"NY",
               "types":[
                  "administrative_area_level_1",
                  "political"
               ]
            },
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"New York, USA",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":45.0158650,
                  "lng":-71.85626990
               },
               "southwest":{
                  "lat":40.4959080,
                  "lng":-79.76214379999999
               }
            },
            "location":{
               "lat":43.29942850,
               "lng":-74.21793260000001
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":45.01261130,
                  "lng":-71.85626990
               },
               "southwest":{
                  "lat":40.4959080,
                  "lng":-79.76214379999999
               }
            }
         },
         "types":[
            "administrative_area_level_1",
            "political"
         ]
      },
      {
         "address_components":[
            {
               "long_name":"United States",
               "short_name":"US",
               "types":[
                  "country",
                  "political"
               ]
            }
         ],
         "formatted_address":"United States",
         "geometry":{
            "bounds":{
               "northeast":{
                  "lat":71.3898880,
                  "lng":-66.94976079999999
               },
               "southwest":{
                  "lat":18.91106420,
                  "lng":172.45469660
               }
            },
            "location":{
               "lat":37.090240,
               "lng":-95.7128910
            },
            "location_type":"APPROXIMATE",
            "viewport":{
               "northeast":{
                  "lat":49.380,
                  "lng":-66.940
               },
               "southwest":{
                  "lat":25.820,
                  "lng":-124.390
               }
            }
         },
         "types":[
            "country",
            "political"
         ]
      }
   ],
   "status":"OK"
}

我的 Java 源代码：

Source Code with Output Link

我正在获取印度，但我必须在输出中打印 Vasant Vihar。

谁能帮我写一些代码来实现这个目标？

任何帮助将不胜感激。

【问题讨论】：

    标签： android json google-geocoding-api


    【解决方案1】：

    我宁愿推荐使用GSON 来解析bean。您可以选择您感兴趣的领域。

    以下是我建议您使用的 bean：

    响应类：

    public class Response {
private Result [] results;
// getters and setters(optional)
}

    结果类：

    public class Result{
private AddressComponent[] addressComponents;
// getters and setters(optional)
}

    地址组件类：

    public class AddressComponent {
private String longName;
private String shortName;
private String [] types;
// getters and setters (optional)
}

    下面是你的解析方式：

    String str = "<the ugly json you pasted>";
Gson gson = new GsonBuilder()
     .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES )
     .create();

    GSON 默认会忽略所有没有对应 Java 字段的 json 属性。

    响应响应 = gson.fromJson(str, Response .class);

    然后您可以像这样访问感兴趣的领域：

    AddressComponent [] AddressComponents = response.getResults()[1].getAddressComponent();

    好的，从现在开始，您可以随意使用该对象。

    【讨论】：

      【解决方案2】：

      从当前json字符串中获取long_name为：

      JSONObject json=new JSONObject("YOUR_JSON_STRING");

 JSONArray ja = json.getJSONArray("results");

for (int i = 0; i < ja.length(); i++) {

  JSONObject jo = ja.getJSONObject(i);

  JSONArray jaa = jo.getJSONArray("address_components");
  for (int j = 0; j < jaa.length(); j++) {

    JSONObject jotwo = jaa.getJSONObject(j);

       //long_name
       String str_long_name=jotwo.getString("long_name");
   }

}

      【讨论】：

      • 您的代码运行良好。但我得到了印度的输出，我必须打印 Vasant Vihar（地区名称）。我已经用我的源代码和输出链接编辑了我的问题，请查看此内容。
      • @ManishAndroid：给我你的 json 链接，因为我认为你得到了不同的 json 字符串
      • 查看此链接：developers.google.com/maps/documentation/geocoding/… 在此页面上，有一个我使用的 JSON URL。
      • 这是我正在使用的链接：maps.googleapis.com/maps/api/geocode/…
      • @ManishAndroid：我知道这一点，但我问你得到什么 json，只需将其粘贴到 Pastbin 并给我链接
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