Want to hide some fields of an object that are being mapped to JSON by Jackson

Question

I have a User class that I want to map to JSON using Jackson.

public class User {     private String name;     private int age;     prviate int securityCode;      // getters and setters } 

I map this to a JSON string using -

User user = getUserFromDatabase();  ObjectMapper mapper = new ObjectMapper();    String json =  mapper.writeValueAsString(user); 

I don't want to map the securityCode variable. Is there any way of configuring the mapper so that it ignores this field?

I know I can write custom data mappers or use the Streaming API but I would like to know if it possible to do it through configuration?

Answer 1

You have two options:

1. Jackson works on setters-getters of fields. So, you can just remove getter of field which you want to omit in JSON. ( If you don't need getter at other place.)

2. Or, you can use the @JsonIgnore annotation of Jackson on getter method of that field and you see there in no such key-value pair in resulted JSON.

   @JsonIgnore public int getSecurityCode(){    return securityCode; }