At the time of writing Jackson converter in version 2.4.6 doesn't support javax.time.LocalDate out of the box. Therefore you need to create your own JsonSerializer and JsonDeserializer. A pretty strait forward implementation could look like this:
public class LocalDateSerializer extends JsonSerializer<LocalDate> {
public void serialize(LocalDate value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
jgen.writeString(value.toString());
}
}
public class LocalDateDeserializer extends JsonDeserializer<LocalDate> {
public LocalDate deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
return LocalDate.parse(jp.getText());
}
}
The more interesting part are the Junit tests. Here I learned how to convert JSON into objects and vice versa with a few lines of code. First we need a Sample class containg a java.time.LocalDate:
private static class Sample {
@JsonSerialize(using = LocalDateSerializer.class)
@JsonDeserialize(using = LocalDateDeserializer.class)
private final LocalDate orderDate = parse("2015-10-07");
public LocalDate getOrderDate() {
return orderDate;
}
}
Just a plain POJO. Let's look at the deserialize test fist:
@Test
public void shoudProperlyDeserializeLocalDateIntoJson() throws IOException {
Sample actual = new ObjectMapper().readValue("{\"orderDate\":" + "\"2015-10-07\"" + "}", Sample.class);
assertEquals(2015, actual.getOrderDate().getYear());
assertEquals(10, actual.getOrderDate().getMonthValue());
assertEquals(7, actual.getOrderDate().getDayOfMonth());
}
Just one line of code to create an object from a JSON string. Nice. And the counterpart: Creating a JSON string from an object.
@Test
public void shoudProperlySerializeLocalDateToJson() throws IOException {
String actual = new ObjectMapper().writeValueAsString(new Sample());
assertEquals("{\"orderDate\":\"2015-10-07\"}", actual);
}
Again a single line of code...cool.