POJO object to JSON Object conversion in java

Question

My requirement is needed to convert POJO OR DTO Object into JSON Format, I have used below methodology

JsonObject obj = gson.toJsonTree(pojo class).getAsJsonObject();
for (String key: obj.keySet()) {
    System.out.println(" key is " + key + " value  is " + obj.get(key));
}

But with this i am getting key data as string(eg:"employee"), so if i insert this data in database it inserting with double quotes("employee") only.

So the problem is not with json conversion but with storing it in the database? — Joakim Danielson
– Joakim Danielson, Commented Jan 9, 2019 at 13:50
yes, it is storing in database as string,JsonObject obj= new JsonObject(gson.toJson(object_need)) by looping obj i am getting proper data. by using this code by problem resolved — Srikanth Janapati
– Srikanth Janapati, Commented Jan 9, 2019 at 16:56

Akiner Alkan · Accepted Answer · 2019-01-09 14:04:38Z

6

You can do it easily by using third party libraries like Jackson or Gson to serialize and deserialize objects.

Jackson: Reference code snippet:

ObjectMapper mapper = new ObjectMapper();
User user = new User();

//Object to JSON in file
mapper.writeValue(new File("c:\\user.json"), user);

//Object to JSON in String
String jsonInString = mapper.writeValueAsString(user);

You can find detailed info from here

Gson: Reference code snippet

User user = new User();
Gson gson = new Gson();

// Object to JSON in String
String json = gson.toJson(object_need);

For detailed usages as reference:

Jackson
Gson

But it seems like the main problem here is you have a problem at inserting the serialized data to DB and to solve that you need to give more information about the issue.

edited Jan 9, 2019 at 14:04

answered Jan 9, 2019 at 13:38

Akiner Alkan

7,0684 gold badges42 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Srikanth Janapati Over a year ago

Thanks for your update , is there anyway by using gson library,instead of jackson library because ,in my project don't have jackson library for this single requirement i can't add jackson jar file in my project.

Akiner Alkan Over a year ago

I answered regarding to title of the question. Since there is no information given about the issue for storing data on DB, I editted my answer to request more information from the OP

Collectives™ on Stack Overflow

POJO object to JSON Object conversion in java

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related