At times it is required to format the values while creating the json for eg Date, numeric value. The jackson json library provide a class JsonSerializer which helps in formatting the Object value.
For e.g
Convert the date return from DB in MM-dd-yyyy
class Person{ private String name; private String city; private Date DOB; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } public Date getDOB() { return DOB; } @JsonSerialize(using = JsonDateSerializer.class) public void setDOB(Date dOB) { DOB = dOB; } } public class JsonDateSerializer extends JsonSerializer { public void serialize(Object value, JsonGenerator gen, SerializerProvider arg2) throws IOException, JsonProcessingException { SimpleDateFormat formatter = new SimpleDateFormat("MM-dd-yyyy"); String formattedDate = formatter.format(value); gen.writeString(formattedDate); } }