Convert JSON To Class Object In Java

Convert JSON To Class Object In Java

In this example we will see how to convert json string to java object with spring framework and jackson apis.

Example:


Json:

String name=
"{
"name" : "Text1"
}";

Create a class for json attribute:

class User{
String name;
}

import com.fasterxml.jackson.anotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

public class ConvertJsonToJavaClassObject{

public static void main(String args[]){
String userString = //json string

ObjectMapper objectMapper = new Jackson2ObjectMapperBuilder().build();
User user = objectMapper.readValue(userString, User.class);

}
}

JSON to Collection object:

json to list:

Jsong string:

String name =

{
users:[{
"name" :"name1"
},
{
"name" :"name2"
}
]
}

Java Example:
class Users {
List<User> users;
}

String userString = //json string

ObjectMapper objectMapper = new Jackson2ObjectMapperBuilder().build();

CollectionType type = objectMapper .getTypeFactory().constructCollectionType(List.class, Users .class);
User user = objectMapper.readValue(userString, type);