POJO对象到Java中的JSON对象转换

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.

Answer 1

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.