@JsonSerialize

@JsonSerialize is used to indicate a custom serializer will be used to marshall the entity.

Let's look at a quick example - we're going to use @JsonSerialize to serialize the eventDate property with a CustomDateSerializer:

public class Event {

    public String name;

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

    public Event() {
    }

    public Event(String name, Date eventDate) {
        this.name = name;
        this.eventDate = eventDate;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getEventDate() {
        return eventDate;
    }

    public void setEventDate(Date eventDate) {
        this.eventDate = eventDate;
    }
}

Here's the simple custom Jackson serializer:

public class CustomDateSerializer extends StdSerializer<Date> {

    private static SimpleDateFormat format =
            new SimpleDateFormat("dd-MM-yyyy hh:mm:ss呵呵");

    public CustomDateSerializer() {
        this(null);
    }
    protected CustomDateSerializer(Class<Date> t) {
        super(t);
    }

    @Override
    public void serialize(Date value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonGenerationException {
        jgen.writeString(format.format(value));
    }
}

Let's use these in a test:

public class CustomDateSerializer extends StdSerializer<Date> {

    private static SimpleDateFormat format =
            new SimpleDateFormat("dd-MM-yyyy hh:mm:ss呵呵");

    public CustomDateSerializer() {
        this(null);
    }
    protected CustomDateSerializer(Class<Date> t) {
        super(t);
    }

    @Override
    public void serialize(Date value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonGenerationException {
        jgen.writeString(format.format(value));
    }
}
/**
output: {"name":"dengyi","eventDate":"01-09-2017 08:53:25呵呵"}
*/