Gson custom deserialization but only one field [duplicate]

Question

I'm receiving from API long json, e.g.:

{
  "field1": "val1",
  "field2": "val2",
  ...
  "SOME_FIELD": "   ABC   ",
  ...
  "fieldx": "valx"
}

I would like to deserialize it with Gson. Everything works fine but field's "SOME_FIELD" value is always with annoying spaces. I would like to trim() this field value (API can't be changed). I know I can use JsonDeserializer but then I have to manually read all fields. Is it possible to edit only one interesing field while deserializing but use auto deserialization for rest of them?

Answer 1

Here I am writing a Demo Class to Convert JSON to a class by ignoring some of the non-used property embedded in JSON.

Here I have used ObjectMapper Class to deserialize the JSONObject as an Object.

 //configuration to enables us to ignore non-used Unknow Properties.
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

Test Class (Code To Convert a Json into a Class Object).

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Test {

    /**
     * @param args
     * @throws IOException 
     * @throws JsonProcessingException 
     * @throws JsonMappingException 
     * @throws JsonParseException 
     */
    public static void main(String[] args) throws JsonParseException, JsonMappingException, JsonProcessingException, IOException {
        Test o = new Test();
        o.GetJsonAsObject(o.putJson());

    }

//function to generate a json for demo Program.
    private String putJson() throws JsonProcessingException{
        HashMap<String, String> v_Obj = new HashMap<>();
        v_Obj.put("field1", "Vikrant");
        v_Obj.put("field2", "Kashyap");
        return new ObjectMapper().writeValueAsString(v_Obj); // change the HashMap as JSONString
    }

   //function to Convert a json Object in Class Object for demo Program.
    private void GetJsonAsObject(String value) throws JsonParseException, JsonMappingException, IOException{
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        Test1 obj = mapper.readValue(value, Test1.class);
        System.out.println(obj);
    }

}

Test1.java (Conversion POJO Class)

class Test1{

    private String field1;

    public String getField1() {
        return field1;
    }

public void setField1(String field1) {
    this.field1 = field1;
}
public String toString(){
    return this.field1.toString();
}

}

Read Comment Properly.. hope you got the concept .

Thanks