Jackson deserialize ISO8601 formatted date-time into Java Instant

Jackson deserialize ISO8601 formatted date-time into Java Instant

To deserialize an ISO8601 formatted date-time string into a Java Instant using the Jackson library, you can use Jackson's @JsonFormat annotation along with the Instant data type. Here's how you can do it:

  1. Add the Jackson library as a dependency in your project if it's not already included. You can do this by adding the following Maven dependency to your pom.xml:

    <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.12.5</version> <!-- Use the latest version available --> </dependency>

  2. Annotate the field in your Java class with @JsonFormat to specify the date-time format and data type. In this case, we want to deserialize the ISO8601 date-time string into an Instant.

  3. Use Jackson's ObjectMapper to perform the deserialization.

Here's an example of how to deserialize an ISO8601 date-time string into a Instant:

import com.fasterxml.jackson.annotation.JsonFormat; import com.fasterxml.jackson.databind.ObjectMapper; import java.io.IOException; import java.time.Instant; public class Main { public static void main(String[] args) throws IOException { String iso8601DateTime = "2023-11-18T15:30:45Z"; // ISO8601 formatted date-time // Create an ObjectMapper ObjectMapper objectMapper = new ObjectMapper(); // Deserialize the ISO8601 date-time string into an Instant MyObject myObject = objectMapper.readValue( "{\"instantValue\":\"" + iso8601DateTime + "\"}", MyObject.class ); // Access the Instant Instant instant = myObject.getInstantValue(); System.out.println("Deserialized Instant: " + instant); } } class MyObject { @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'", timezone = "UTC") private Instant instantValue; public Instant getInstantValue() { return instantValue; } public void setInstantValue(Instant instantValue) { this.instantValue = instantValue; } }

In this example:

  • We use the @JsonFormat annotation on the instantValue field of the MyObject class to specify the desired date-time format ("yyyy-MM-dd'T'HH:mm:ss'Z'") and timezone ("UTC").

  • We create an ObjectMapper and use its readValue method to deserialize the JSON object, which contains the ISO8601 formatted date-time string, into an instance of MyObject.

  • The getInstantValue method allows us to access the Instant value after deserialization.

Make sure to adjust the pattern and timezone attributes of the @JsonFormat annotation to match the format of your ISO8601 date-time strings and the desired timezone.

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