Jackson Change Name of the Field

by Online Tutorials Library July 22, 2022

Jackson Change Name of the Field

When we serialize a Java Object, we need to change the name of a specific field for mapping it with another JSON property. It is one of the most used and important concepts of Jackson to learn and understand.

In order to change the field name, we use the @JsonProperty annotation. In the annotation constructor, we pass the name of the property.

Let’s take an example to understand how we can use @JsonProperty annotation to change the name of the field for serialization.

ChangeNameOfFieldExample.java

  //import required classes and package if any      import com.fasterxml.jackson.annotation.JsonProperty;  import com.fasterxml.jackson.core.JsonProcessingException;  import com.fasterxml.jackson.databind.JsonMappingException;  import com.fasterxml.jackson.databind.ObjectMapper;    //create class ChangeNameOfFieldExample to understand how we can change the name of the field while serializing  public class ChangeNameOfFieldExample {      //main() methods start    public static void main(String args[]) {      // create an instance of ObjectMapper class    ObjectMapper mapper = new ObjectMapper();      String json = “{“name”:”ABES”,”university”:”AKTU”, “address”:”NH-24 Highway GZB UP”, “rank”:”1″}”;             // de-serializing Json into Java object    College colg;  try {  colg = mapper.readerFor(College.class).readValue(json);    // print id, name and course of student        System.out.println(colg.getCollegeName());        System.out.println(colg.getUniversityName());        System.out.println(colg.getAddress());      System.out.println(colg.getRank());        } catch (JsonMappingException e) {  // TODO Auto-generated catch block  e.printStackTrace();  } catch (JsonProcessingException e) {  // TODO Auto-generated catch block  e.printStackTrace();  }  }    }   //create class College  class College {        //Creating properties of College class      private String name;        private String university;     private String address;   private String rank;       // default constructor   College(){    }    // constructor    College(String name, String university, String address, String rank){    this.name = name;    this.university = university;    this.address = address;    this.rank = rank;    }    @JsonProperty(“name”)    public String getCollegeName() {    return name;    }  public void setCollegeName(String name) {    this.name = name;    }  @JsonProperty(“university”)    public String getUniversityName() {    return university;    }  public void setUniversityName(String university) {    this.university = university;  }  public String getAddress() {    return address;    }  public void setAddress(String address) {    this.address = address;    }  public String getRank() {    return rank;    }  public void setRank(String rank) {    this.rank = rank;    }  }  

Output:

Jackson Change Name of the Field

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