Parsing dynamic key and value nested json - parsing

Question

{
"buildingNumber": 123,
"apatmentNumber": "4567",
"apartments": "123",
"isActive": true,
"possibleActions": [
"ENTER",
"EXIT"
],
"enterVia": {
"J1-B1": [
"DEFAULT_ROUTE"
],
"A1-D1": [
"DEFAULT_ROUTE"
]
},
"SectionMap": {},
"route": "abc|def (via xyz)"
}
I have above sample JSON. Whole content inside "enterVia" is dynamic.
I have to read this nested Json (shown below) from a response and send it in another request.
{
"J1-B1": [
"DEFAULT_ROUTE"
],
"A1-D1": [
"DEFAULT_ROUTE"
]
}
Please suggest a way if it is possible using Gson, ObjectMapper.

Answer 1

I found a solution using ObjectMapper. Below is the code:
import java.io.IOException;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonParseTest {
public static void main(String[] args) {
String json = "{\r\n\t\"J1-B1\": [\r\n\t\t\"DEFAULT_ROUTE\"\r\n\t],\r\n\t\"A1-D1\": [\r\n\t\t\"DEFAULT_ROUTE\"\r\n\t]\r\n}";
ObjectMapper objectMapper = new ObjectMapper();
Map<String, List<String>> routesMap = null;
try {
routesMap = objectMapper.readValue(json, new TypeReference<Map<String, List<String>>>(){});
} catch (JsonParseException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (JsonMappingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
System.out.println("read response output: " +routesMap);
objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
String jsonRequest = null;
try {
jsonRequest = objectMapper.writeValueAsString(routesMap);
} catch (JsonProcessingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("next request output: " +jsonRequest);
}
}
Output of the program:
read response output: {J1-B1=[DEFAULT_ROUTE], A1-D1=[DEFAULT_ROUTE]}
next request output: {"J1-B1":["DEFAULT_ROUTE"],"A1-D1":["DEFAULT_ROUTE"]}