将 DateTimeFormatter 与 ObjectMapper 结合使用

Question

在Java8之前，我们使用ObjectMapper来设置DateFormat如下

DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
ObjectMapper mapper = <SomeInstantiation>
mapper.setDateFormat(df);
mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

现在我们有了 java.time.format.DateTimeFormatter，它与 SimpleDateFormat 不同，它是线程安全的并且更健壮。我想替换 ObjectMapper 上的上述设置。

如何使用 ObjectMapper 设置 DateTimeFormatter

Answer 1

您可以尝试以下操作：

DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;

LocalDateTimeDeserializer dateTimeDeserializer = new LocalDateTimeDeserializer(formatter);
LocalDateTimeSerializer dateTimeSerializer = new LocalDateTimeSerializer(formatter);

JavaTimeModule javaTimeModule = new JavaTimeModule(); 
javaTimeModule.addDeserializer(LocalDateTime.class, dateTimeDeserializer);
javaTimeModule.addSerializer(LocalDateTime.class, dateTimeSerializer);

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(javaTimeModule);

jackson-datatype-jsr310需要依赖：

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.8.2</version>
</dependency>