Spring boot Check Dto Format with two patterns

Question

I'm working with Spring-boot to expose REST Api and I need to check two differents patterns of date for my input DTO. For now, my code checks the format

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd")

but I need to give to client possibility to send date also with the format "yyyy-MM.
One of solutions is tu use annotation @Pattern rather than @JsonFormat annotation but the neede regex to validate the two dates is too long, I want to know if there is a better solution.

Yes. The proposed solution in the first answer works with some modification. I'm using StdDeserializer and it works but I dont know what's better — nassim
– nassim, Commented Jul 23, 2018 at 14:27

nassim · Accepted Answer · 2018-07-27 10:01:51Z

try something like below,

public class CustomDateSerializer extends StdSerializer<Date> {

    private SimpleDateFormat formatter
            = new SimpleDateFormat("dd-MM-yyyy");
    private SimpleDateFormat formatter1
            = new SimpleDateFormat("dd-MM");

    public CustomDateSerializer() {
        this(null);
    }

    public CustomDateSerializer(Class t) {
        super(t);
    }

    @Override
    public void serialize (Date value, JsonGenerator gen, SerializerProvider arg2)
            throws IOException, JsonProcessingException {
        Date date;
        try {
            //if not valid, it will throw ParseException
            date = formatter.parse(value.toString());
        } catch (ParseException e) {
            try {
                date = formatter1.parse(value.toString());
            }catch(ParseException ex) {
                ex.printStackTrace();                    
            }
        }
        gen.writeString(formatter.format(date));
    }
}

and @JsonSerialize(using = CustomDateSerializer.class) public Date eventDate;

SeaBiscuit · Accepted Answer · 2018-07-20 10:59:05Z

1

You have many ways of achieving this. Two of which are

1 JsonDeserialize

Register custom deserializer

public class DateDeserializer extends JsonDeserializer<LocalDate> {
    @Override
    public LocalDatedeserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    // .................
    // try multiple formats in a loop here if, success return date if not throw exception
    return something;
   }
}
  @JsonDeserialize(using = DateDeserializer .class)
  private LocalDate date;

2 Use string setter and parse date manually

private String someDate;
public LocalDate setSomeDate(String someDate){
  // loop through patterns here and try to parse date, then assign parsed date to 
  // another value you are going to use internally 
  // I usually keep string value as well 
}

answered Jul 20, 2018 at 10:59

SeaBiscuit

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1 Comment

nassim Over a year ago

I got Failed to evaluate Jackson deserialization for type, It works with StdDeserializer<Date>. Do you know what can be the cause of this error and why to use JsonDeserializer rather than StdDeserializer ?

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