EN
Java - parse JSON to object with Jackson lib
5 points
In this short article, we would like to show how to convert JSON to Java object, using external Jackson library.
Quick solution:
xxxxxxxxxx1
// import com.fasterxml.jackson.core.JsonProcessingException;2
// import com.fasterxml.jackson.databind.ObjectMapper;3
4
ObjectMapper objectMapper = new ObjectMapper();5
6
String userJson = "{\"name\":\"John\",\"age\":21}"; // {"name":"John","age":21}7
User userObject = objectMapper.readValue(userJson, User.class);8
9
System.out.println(userObject.getName()); // John10
System.out.println(userObject.getAge()); // 21
Hint: to know how to attach
*.jarlib to out project read this article.
Note: if you want to convert
Objectto JSONStringread this article.
Link to the library in the Maven repository:
https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind
Main.java file content:
xxxxxxxxxx1
package examples;2
3
import com.fasterxml.jackson.core.JsonProcessingException;4
import com.fasterxml.jackson.databind.ObjectMapper;5
6
public class Main {7
8
public static void main(String[] arg) throws JsonProcessingException {9
10
ObjectMapper objectMapper = new ObjectMapper();11
12
String userJson = "{\"name\":\"John\",\"age\":21}";13
User userObject = objectMapper.readValue(userJson, User.class);14
15
System.out.println(userObject.getName()); // John16
System.out.println(userObject.getAge()); // 2117
}18
}Example output:
xxxxxxxxxx1
John2
21
User.java file content:
xxxxxxxxxx1
package examples;2
3
public static class User {4
5
private String name;6
private int age;7
8
// required no-arguments constructor9
public User() {10
// nothing here ...11
}12
13
public String getName() {14
return this.name;15
}16
17
public int getAge() {18
return this.age;19
}20
}
