JSONobject inside JSONObject in java

Question

I have following request mapping:

@RequestMapping(value = "/reCalculated", method = RequestMethod.POST)
public @ResponseBody void reCalculated(JSONObject obj) {

    obj.
}

and then i have incoming json

{"params":{"date_a":"2017-05-01","date_b":"2017-05-02"}}

but in java, obj. only gives me options toString() and toJSONString() meanwhile all the tutorials, and few threads clearly tell me i should be able to do obj.getJSONObject("params") Why is this? how can i access my parameters?

<dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
        <version>1.1.1</version>
 </dependency>

is the dependency.

Why are you not considering defining a POJO data model and map the @RequestBody to it? — Brad
– Brad, Commented Nov 23, 2018 at 8:44

Ryuzaki L · Accepted Answer · 2018-11-23 07:49:33Z

1

json-simple library had method get(String name) and need external type casting like below

String name = (String) jsonObject.get("name");
JSONArray msg = (JSONArray) jsonObject.get("messages");
long age = (Long) jsonObject.get("age");

But gson library has predefined methods here

public JsonObject getAsJsonObject(String memberName)
public JsonArray getAsJsonArray(String memberName)

Maven dependency

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.3</version>
</dependency>

edited Nov 23, 2018 at 7:49

answered Nov 23, 2018 at 7:38

Ryuzaki L

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Comments

Tran Ho · Accepted Answer · 2018-11-23 07:48:12Z

1

You can get JSONString from your param

Gson gson = (new GsonBuilder()).create();
jsonString = obj.get("params").getAsString();
JsonObject param= gson.fromJson(jsonString, JsonObject.class);

As Deadpool said, you want to use gson but you added json-simple dependency.

answered Nov 23, 2018 at 7:48

Tran Ho

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