Transforming JSON date format to a different one using Jackson libraries

Question

Transforming JSON date format to a different one using Jackson libraries

My spring boot 1.3.5 application is using jackson with the dependency "com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.5.0".

Encountering an issue when a user inputs a date value in a format different than expected (mm/dd/yyyy) during a POST request, resulting in a severe error displayed on the UI without any logs in the server:

"Could not read document: Text '08-21-1999' could not be parsed at index 2 (through reference chain: com.xxx.yyy.MyDTO["firstofficevisit"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Text '08-21-1999' could not be parsed at index 2 (through reference chain: com.xxx.yyy.MyDTO["firstofficevisit"])"

The JSON payload causing this issue shows that dateOfBirth works fine but firstofficevisit triggers the aforementioned error:

{
   "patientId":3,
   "dateOfBirth":"04/11/1984",
   "firstofficevisit":"08-21-1999",
   ...
}

The DTO class includes the following annotations for date formatting:

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "MM/dd/yyyy")
private LocalDate dateOfBirth;

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "MM/dd/yyyy")
private LocalDate firstofficevisit;

However, dates need to be submitted exactly in the specified format for them to be processed correctly. I have a utility called DateUtil in Java which handles date conversions, and I am considering integrating it with my DTO:

public class DateUtil {
    ...

The challenge lies in validating the various date formats as strings coming from the client side, especially with multiple date fields involved. I'm looking for suggestions on whether Jackson can be configured to work more flexibly with DateUtil.java or if enforcing validation on the client side would be a better approach. Any examples or insights shared would be greatly appreciated.

javascript json spring-boot jackson

Answer 1

Answer №1

To handle multiple date formats in Java 8 and Jackson, one approach is to utilize a custom JsonDeserializer along with optional patterns. By listing the desired date formats in a specific order, you can ensure successful parsing without having to preprocess the JSON as text.

An example of implementing this can be seen below:

class LocalDateParser extends JsonDeserializer<LocalDate> {

    private final DateTimeFormatter dateFormatter = new DateTimeFormatterBuilder()
            .appendOptional(DateTimeFormatter.ofPattern("MM-dd-yyyy"))
            .appendOptional(DateTimeFormatter.ofPattern("MM/dd/yyyy"))
            .toFormatter();

    @Override
    public LocalDate deserialize(JsonParser jsonparser, DeserializationContext context) throws IOException {
        return LocalDate.parse(jsonparser.getText(), dateFormatter);
    }
}

This approach allows for flexibility in handling different date formats within your application. Simply annotate your fields like so:

@JsonDeserialize(using = LocalDateParser.class)
public LocalDate firstofficevisit;

Answer 2

To handle multiple date formats in Java 8 and Jackson, one approach is to utilize a custom JsonDeserializer along with optional patterns. By listing the desired date formats in a specific order, you can ensure successful parsing without having to preprocess the JSON as text.

An example of implementing this can be seen below:

class LocalDateParser extends JsonDeserializer<LocalDate> {

    private final DateTimeFormatter dateFormatter = new DateTimeFormatterBuilder()
            .appendOptional(DateTimeFormatter.ofPattern("MM-dd-yyyy"))
            .appendOptional(DateTimeFormatter.ofPattern("MM/dd/yyyy"))
            .toFormatter();

    @Override
    public LocalDate deserialize(JsonParser jsonparser, DeserializationContext context) throws IOException {
        return LocalDate.parse(jsonparser.getText(), dateFormatter);
    }
}

This approach allows for flexibility in handling different date formats within your application. Simply annotate your fields like so:

@JsonDeserialize(using = LocalDateParser.class)
public LocalDate firstofficevisit;

Transforming JSON date format to a different one using Jackson libraries

Answer №1

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