Jackson - Tree to java Objects


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In this example, we've created a Tree using JsonNode and write it to a json file and read back tree and then convert it as a Student object.

Create a java class file named JacksonTester in C:\>Jackson_WORKSPACE.

File: JacksonTester.java

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class JacksonTester {
   public static void main(String args[]){
      JacksonTester tester = new JacksonTester();
      try {
         ObjectMapper mapper = new ObjectMapper();

         JsonNode rootNode = mapper.createObjectNode();
         JsonNode marksNode = mapper.createArrayNode();
         ((ArrayNode)marksNode).add(100);
         ((ArrayNode)marksNode).add(90);
         ((ArrayNode)marksNode).add(85);
         ((ObjectNode) rootNode).put("name", "Mahesh Kumar");
         ((ObjectNode) rootNode).put("age", 21);
         ((ObjectNode) rootNode).put("verified", false);
         ((ObjectNode) rootNode).put("marks",marksNode);

         mapper.writeValue(new File("student.json"), rootNode);

         rootNode = mapper.readTree(new File("student.json"));

         Student student = mapper.treeToValue(rootNode, Student.class);

         System.out.println("Name: "+ student.getName());
         System.out.println("Age: " + student.getAge());
         System.out.println("Verified: " + (student.isVerified() ? "Yes":"No"));
         System.out.println("Marks: "+Arrays.toString(student.getMarks()));
      } catch (JsonParseException e) {
         e.printStackTrace();
      } catch (JsonMappingException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

class Student {
   String name;
   int age;
   boolean verified;
   int[] marks;
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
   public int getAge() {
      return age;
   }
   public void setAge(int age) {
      this.age = age;
   }
   public boolean isVerified() {
      return verified;
   }
   public void setVerified(boolean verified) {
      this.verified = verified;
   }
   public int[] getMarks() {
      return marks;
   }
   public void setMarks(int[] marks) {
      this.marks = marks;
   }
}

Verify the result

Compile the classes using javac compiler as follows:

C:\Jackson_WORKSPACE>javac JacksonTester.java

Now run the jacksonTester to see the result:

C:\Jackson_WORKSPACE>java JacksonTester

Verify the Output

Name: Mahesh Kumar
Age: 21
Verified: No
Marks: [ 100 90 85 ]
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