Gson解析要點:
1、內部巢狀的類必須是static的，要不然解析會出錯；
2、類裡面的屬性名必須跟Json欄位裡面的Key是一模一樣的；

Json格式:

{
    "content":{
        "identity":"8840e0f067cd11e89485ed92ccd5da27",
        "hints":{
            "level":"SUCCESS",
            "tips":{
            }
        },
        "context":{
        },
        "content":{
            "balance
 
":"52.42"
        }
    }
}

java實體類:

public class VipBalanceBean   {
    public ContentBean content;
    public static class ContentBean  {
        public String identity;
        public Hints hints;
        public Context context;
        public Content1 content;
        public static class Hints  {
            public
 
 String level;
            public Tips tips;

            public static class Tips {
            }
        }
        public static class Context {
        }
        public static class Content1  {
            public String balance;
        }
    }
}