注解@JsonSerialize的应用

1. 注解的作用：自定义字段序列化规则
2. 使用示例：自定义序列化Date的规则

public class EventWithSerializer {
    public String name;

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

public class CustomDateSerializer extends StdSerializer<Date> {

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

    public CustomDateSerializer() { 
        this(null); 
    } 

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

    @Override
    public void serialize(
      Date value, JsonGenerator gen, SerializerProvider arg2) 
      throws IOException, JsonProcessingException {
        gen.writeString(formatter.format(value));
    }
}