包括Gson的顶级元素(Including a top level element with Gson)

 我有这样的POJO 
 
public class Pojo {
    ...
    public static String toJson(ArrayList<Pojo> pojos) {
        Gson gson = new Gson();
        return gson.toJson(pojos);
    }
}
 
 输出是： 
 
[
  {  
    "arrival": "19:12:30",
    "typeOfDay": "regular",
    "stopCode": "CMPZ",
    "route": "B",
    "id": 1
  },
  {
    "arrival": "19:13:30",
    "typeOfDay": "regular",
    "stopCode": "AVSV",
    "route": "B",
    "id": 2
  }
]
 
 但我想要的是这个： 
 
{
  "pojos": [
   {  
     "arrival": "19:12:30",
     "typeOfDay": "regular",
     "stopCode": "CMPZ",
     "route": "B",
     "id": 1
   },
   {
     "arrival": "19:13:30",
     "typeOfDay": "regular",
     "stopCode": "AVSV",
     "route": "B",
     "id": 2
   }
  ]
}
 
 我怎么能这样做？ 我正在使用Gson 2.2.4 

I have a POJO like this 
 
public class Pojo {
    ...
    public static String toJson(ArrayList<Pojo> pojos) {
        Gson gson = new Gson();
        return gson.toJson(pojos);
    }
}
 
The output is:
 
[
  {  
    "arrival": "19:12:30",
    "typeOfDay": "regular",
    "stopCode": "CMPZ",
    "route": "B",
    "id": 1
  },
  {
    "arrival": "19:13:30",
    "typeOfDay": "regular",
    "stopCode": "AVSV",
    "route": "B",
    "id": 2
  }
]
 
But what I want is this:
 
{
  "pojos": [
   {  
     "arrival": "19:12:30",
     "typeOfDay": "regular",
     "stopCode": "CMPZ",
     "route": "B",
     "id": 1
   },
   {
     "arrival": "19:13:30",
     "typeOfDay": "regular",
     "stopCode": "AVSV",
     "route": "B",
     "id": 2
   }
  ]
}
 
How I can do it? I'm using Gson 2.2.4

原文：https://stackoverflow.com/questions/20530892