To serialize an Instant
object without nanoseconds using Spring Boot with Jackson, you can use the following steps:
- Configure the
ObjectMapper
bean to use theJavaTimeModule
:
@Bean
public ObjectMapper objectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.registerModule(new JavaTimeModule());
return objectMapper;
}
- Use the
@JsonFormat
annotation to specify the format of theInstant
object:
public class MyDto {
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'", timezone = "UTC")
private Instant date;
// Getters and setters for date
}
- When serializing the
Instant
object, it will now be formatted as a string in the specified pattern, without the nanoseconds.
MyDto dto = new MyDto();
dto.setDate(Instant.now());
String json = objectMapper.writeValueAsString(dto);
This will produce a JSON string like the following:
{"date":"2022-12-23T00:00:00Z"}
Note that the JavaTimeModule
also provides additional customization options for serializing and deserializing other Java 8 date and time types, such as LocalDate
, LocalTime
, etc. You can read more about these options in the Jackson documentation.