在Java中解析Json对象中动态名称的最佳方法是什么？

Question

I would prefer to use com.fasterxml.jackson if that possible. I'm looking for a way to parse json like this:

{
   "availability":{
      "48":{              //this is dynamic (in next response that number can be different, like 1023)
         "2018-02-08":{   //this is dynamic
            "temp":null
         },
         "2018-02-09":{   //this is dynamic
            "temp":null
         }
      },
      "49":{              //this is dynamic
         "2018-02-08":{   //this is dynamic
            "temp":null
         },
         "2018-02-09":{   //this is dynamic
            "temp":null
         }
      }
   }
}

Answer 1

You can use GSON by google:

        import com.google.gson.Gson;
        import com.google.gson.JsonArray;
        import com.google.gson.JsonElement;

        HttpClient httpClient = httpClientIgnoreCertificates();
        HttpGet get = new HttpGet(uri);
        HttpResponse response;
        String responseEntity = null;
        try {
             response = httpClient.execute(get);
             responseEntity = IOUtils.toString(response.getEntity().getContent(), "UTF-8");
        } catch (IOException e) {
                    e.printStackTrace();
        }
        JsonArray jsonObjects = new Gson().fromJson(responseEntity, 
        JsonArray.class);
        JsonArray items =
   jsonObjects.get(0).getAsJsonObject().get("availability").getAsJsonArray();

And than you can do actions with your jsonArray..

Answer 2

Two ways to do it in fasterxml Jackson.

1. Try using the JSON Tree model

The Api JsonNode takes care of converting the input String to a parsable Json Object. you can find the tutorials to use them in the following links Baeldung's Site , and API details are in this link

I tried running your example here, PFB the debug screenshot...

2. Try the Json Object Model as detailed in this Dzone Link

At the class level add annotation @JsonInclude(JsonInclude.Include.NON_NULL) this will exclude any elements which are null when doing un-marshalling to the corresponding domain object