Java Jackson with Maven Example


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In order to work with the Java Jackson library you will need to add the Jackson dependency to the pom.xml

Jackson Maven Dependencies (JSON, XML and Annotation)
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.4</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.13.4</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.13.4</version>
</dependency>
Example: Convert JSON String to Java Object:

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

public class JavaStringToJson {

    public static void main(String[] args) {
        try {
            String javaJsonString = "{\"empName\":\"Alex\",\"empAge\":25}";
            ObjectMapper objectMapper = new ObjectMapper();
            JsonNode jsonNode = objectMapper.readTree(javaJsonString);
            String name = jsonNode.get("empName").asText();
            int age = jsonNode.get("empAge").asInt();
            System.out.println(empName +" : " + empAge);

        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
Output: Alex : 25

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