在春季使用 JSR310 java.time 时将日期、即时序列化为 ISO 8601

Question

我正在用 JSR310 替换 JodaTime，并且 JodaTime() 的模块工作正常。

我正在尝试在我的 spring-boot 应用程序中重新配置日期的序列化。

我不能同时保留两者，所以我正在寻找一种方法来将我的日期序列化/反序列化为 ISO 8601。

我遵循了这里的建议，但这并没有帮助： http://lewandowski.io/2016/02/formatting-java-time-with-spring-boot-using-json/

这是我的JacksonConfig.java 和objectMapper：

@Configuration
public class JacksonConfig extends RepositoryRestMvcConfiguration {

    private static final Logger logger = LoggerFactory.getLogger(JacksonConfig.class);
    public static final DateTimeFormatter FORMATTER = ofPattern("dd::MM::yyyy");

    @Bean
    // Override and Primary due to bug: https://github.com/spring-projects/spring-boot/issues/6529
    @Override
    @Primary
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);
        mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer());
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer());
        mapper.registerModule(javaTimeModule);
        return mapper;
    }

    public class LocalDateSerializer extends JsonSerializer<LocalDate> {
        @Override
        public void serialize(LocalDate value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
            gen.writeString(value.format(FORMATTER));
        }
    }
    public class LocalDateDeserializer extends JsonDeserializer<LocalDate> {
        @Override
        public LocalDate deserialize(JsonParser p, DeserializationContext ctx) throws IOException {
            return LocalDate.parse(p.getValueAsString(), FORMATTER);
        }
    }
}

bean 被实例化，但 serialize 和 deserialize 从未被调用。

我也试过没有自定义序列化器/反序列化器的JavaTimeModule，它也不起作用。

好像一点效果都没有。

有没有办法再调试一下？

我正在使用 spring-hateoas 和 spring-data，我遇到了可能相关的问题：

https://github.com/spring-projects/spring-hateoas/issues/333

Answer 1

利用 java time 模块中提供的 ser/deser。这实际上使用自定义格式化程序设置它们。

import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;

public ObjectMapper objectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    JavaTimeModule javaTimeModule = new JavaTimeModule();
    LocalDateSerializer localDateSerializer = new LocalDateSerializer(FORMATTER);
    javaTimeModule.addSerializer(LocalDate.class, localDateSerializer);
    LocalDateDeserializer localDateDeserializer = new LocalDateDeserializer(FORMATTER);
    javaTimeModule.addDeserializer(LocalDate.class, localDateDeserializer);
    mapper.registerModule(javaTimeModule);
    return mapper;
}