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:
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// import com.fasterxml.jackson.core.JsonProcessingException;2
// import com.fasterxml.jackson.databind.ObjectMapper;3
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ObjectMapper objectMapper = new ObjectMapper();5
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String userJson = "{\"name\":\"John\",\"age\":21}"; // {"name":"John","age":21}7
User userObject = objectMapper.readValue(userJson, User.class);8
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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:
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package examples;2
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import com.fasterxml.jackson.core.JsonProcessingException;4
import com.fasterxml.jackson.databind.ObjectMapper;5
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public class Main {7
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public static void main(String[] arg) throws JsonProcessingException {9
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ObjectMapper objectMapper = new ObjectMapper();11
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String userJson = "{\"name\":\"John\",\"age\":21}";13
User userObject = objectMapper.readValue(userJson, User.class);14
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System.out.println(userObject.getName()); // John16
System.out.println(userObject.getAge()); // 2117
}18
}Example output:
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John2
21
User.java file content:
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package examples;2
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public static class User {4
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private String name;6
private int age;7
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// required no-arguments constructor9
public User() {10
// nothing here ...11
}12
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public String getName() {14
return this.name;15
}16
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public int getAge() {18
return this.age;19
}20
}