使用Gson解析嵌套数组的json

概述我是Gson解析的新手,并且做了很少的基本Gson解析.但这次我的JSON非常复杂.我的JSON看起来像：{"uname":"man101","uid":"2","account":{"entry":[8,15.48],"exit":[8,15.48],"detai

我是Gson解析的新手,并且做了很少的基本Gson解析.但这次我的JSON非常复杂.我的JSON看起来像：

{"uname":"man101","uID":"2",    "account":{            "entry":[8,15.48],            "exit":[8,15.48],            "details":                [[0,0],[0,8.2],[1.15,8.2],[1.15,18.23],[7.33,18.23],[7.33,15.48],[12.15,2.28],                [12.35,2.28],[12.35,0],[10.65,0],[10.65,1.42],[8.1,1.42],[8.1,3.95],                [4.25,3.95],[4.25,0]],            "section":                [                   {                        "account":[[0,0],[0,3.35],                            [4.25,3.35],[4.25,0]],                            "category":"office",                           "description":"Mobile based company",                           "sectionname":"xyz",                           "ID":1                  },                  {                        "account":[[0,3.95],[0,7.8],                              [4.25,7.8],4.25,3.95]],                        "category":"office",                        "description":"Network based company",                        "sectionname":"ABC",                        "ID":2                  },                ]            },    "category":"Cowork",    "description":"Combined office space"}

我试图通过以下方式解析它

public class AccountData{    public String uname;    public String uID;    public String category;    public String description;    public Account account;    public class Account    {        public float[] entry;        public float[] exit;        public List<float[]> details;        public List<Section> section;    }    public class Section    {        public List<float[]> account;        public String category;        public String description;        public String sectionname;        public String ID;    }}

并尝试传递这样的结果

 Gson gson = new Gson(); beaconList = gson.fromJson(result, AccountData.class);

它运行时没有任何错误,但是当我尝试访问某些数据时,它会提供空值.

解决方法:

首先,您的JsON是错误的,这是更正的版本(请注意,例如代码第9行中的额外逗号).

{  "uname": "man101",   "uID": "2",   "account": {    "entry": [      8,       15.48    ],     "exit": [      8,       15.48    ],     "details": [      [        0,         0      ],       [        0,         8.2      ],       [        1.15,         8.2      ],       [        1.15,         18.23      ],       [        7.33,         18.23      ],       [        7.33,         15.48      ],       [        12.15,         2.28      ],       [        12.35,         2.28      ],       [        12.35,         0      ],       [        10.65,         0      ],       [        10.65,         1.42      ],       [        8.1,         1.42      ],       [        8.1,         3.95      ],       [        4.25,         3.95      ],       [        4.25,         0      ]    ],     "section": [      {        "account": [          [            0,             0          ],           [            0,             3.35          ],           [            4.25,             3.35          ],           [            4.25,             0          ]        ],         "category": "office",         "description": "Mobile based company",         "sectionname": "xyz",         "ID": 1      },       {        "account": [          [            0,             3.95          ],           [            0,             7.8          ],           [            4.25,             7.8          ],           [            4.25,             3.95          ]        ],         "category": "office",         "description": "Network based company",         "sectionname": "ABC",         "ID": 2      }    ]  },   "category": "Cowork",   "description": "Combined office space"}

您可以使用http://json.parser.online.fr/或http://www.bodurov.com/JsonFormatter/查看您的Json.

其次,Gson不喜欢内部类,除非它们被声明为静态.

第三：避免在类中混合数组和泛型,泛型使用起来更安全,所以我重新定义了您的类,如下所示：

public class AccountData {   public String uname;   public String uID;   public String category;   public String description;   public Account account;   public static class Account {      public List<Double> entry;      public List<Double> exit;      public List<List<Double>> details;      public List<Section> section;   }   public static class Section {      public List<List<Double>> account;      public String category;      public String description;      public String sectionname;      public String ID;   }}

如果您不喜欢内部静态类,则可以始终将Section和Account放入单独的文件中(当然,不使用静态关键字).

编辑

正如Brian Roach在评论中指出的那样,内部类不再需要静态与Gson一起工作.所以第2点不再是真的,你可以从类声明中删除静态.

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