java - 如何为 java.time.LocalDateTime 自定义全局 Jackson 反序列化器

Question

Jackson 的 JavaTimeModule 序列化/反序列化 java.time全局通用，但其默认日期时间格式是 ISO 标准，例如 2018-01-10T10:20:30对于 LocalDateTime 和 2018-01-10T10:20:30+08:00对于偏移日期时间。但我需要设置一个全局本地格式，如 2018-01-10 10:20:30对于 LocalDateTime 和 OffsetDateTime，没有 T和OffsetTime(使用本地默认OffsetTime)。我怎样才能做到这一点？

Notes: I know about @JsonFormat, @JsonSerialize and @JsonDeserialize. That is not global setting.

Answer 1

Spring 启动

    @SpringBootApplication
    public class Application implements Jackson2ObjectMapperBuilderCustomizer {
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }

        @Override
        public void customize(Jackson2ObjectMapperBuilder builder) {
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            LocalDateTimeSerializer localDateTimeSerializer = new LocalDateTimeSerializer(formatter);

            builder.failOnEmptyBeans(false) // prevent InvalidDefinitionException Error
                    .serializerByType(LocalDateTime.class, localDateTimeSerializer);
        }
    }

Springboot 和 Spring 框架

    @Configuration
    public class WebMvcConfig implements WebMvcConfigurer {
        @Override
        public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            LocalDateTimeSerializer localDateTimeSerializer = new LocalDateTimeSerializer(formatter);
            LocalDateTimeDeserializer localDateTimeDeserializer = new LocalDateTimeDeserializer(formatter);

            JavaTimeModule module = new JavaTimeModule();
            module.addSerializer(LocalDateTime.class, localDateTimeSerializer);
            module.addDeserializer(LocalDateTime.class, localDateTimeDeserializer);

            ObjectMapper mapper = new ObjectMapper();
            mapper.registerModule(module);
            // add converter at the very front
            // if there are same type mappers in converters, setting in first mapper is used.
            converters.add(0, new MappingJackson2HttpMessageConverter(mapper));
        }
    }

希望这可以帮助你。