Question 269164 in Json Question posted in
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Java Multiple json names for same object field during serialisation

For serialising a java object’s name field in json, if I have a java class:

Class Test {
  private String name;

}

When I create the Test object with a name.

In scenario one, when I serialise the test object, I would like the name field to be represented as name.

{ "name": "Bob"}

In scenario two , when I serialise the test object, I would like the name field to be represented as firstName.

{ "firstName": "Bob"}

How can I achieve this with jackson.

Thanks

Tags:

2

Answers


  1. 0

    You have to use @JsonProperty annotation to set the desired custom field name that you want to show on serialization.

    public class Test {
  
   private String name; 

   public void setName(String name) {
     this.name = name;
   }

   @JsonProperty("firstName")
   public String getName() {
      return this.name;
   }

}
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  2. 0

    You can user Views.

    Views

    public class Views {

    public static class Foo {
    }

    public static class Bar {
    }
}

    DTO

    import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonView;

public class User {
    @JsonView(Views.Foo.class)
    @JsonProperty("name")
    public String name;

    @JsonView(Views.Bar.class)
    @JsonProperty("firstName")
    public String firstName;

    @JsonProperty("lastName")
    public String lastName;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.name = this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

    Test

    class JacksonViewTest {

    @Test
    void viewFoo() throws IOException {
        User user = new User();
        user.setFirstName("John");
        user.setLastName("Doe");

        String json = new ObjectMapper()
                .writerWithView(Views.Foo.class)
                .writeValueAsString(user);

        assertSame("{"name":"John","lastName":"Doe"}", json);
    }

    @Test
    void viewBar() throws IOException {
        User user = new User();
        user.setFirstName("John");
        user.setLastName("Doe");

        String json = new ObjectMapper()
                .writerWithView(Views.Bar.class)
                .writeValueAsString(user);

        assertSame("{"firstName":"John","lastName":"Doe"}", json);
    }

}
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