关于springboot项目中返回时间序列化差8小时问题

springboot项目中返回时间序列化差8小时

查看源码发现，在springboot2.x以后，序列化配置作出以下修改

@Configuration
@ConditionalOnClass(ObjectMapper.class)
public class JacksonAutoConfiguration {

    private static final Map<?, Boolean> FEATURE_DEFAULTS;

    static {
        Map<Object, Boolean> featureDefaults = new HashMap<>();
        featureDefaults.put(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        FEATURE_DEFAULTS = Collections.unmodifiableMap(featureDefaults);
    }
}

如果

featureDefaults.put(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, true);

则可以返回时间戳，具体配置如下：

spring:
  jackson:
    serialization: 
      write-dates-as-timestamps: true

如果想要返回时间格式化类型，即DateFormat格式化后的结果。可以看到源码中

    /**
     * Method for overriding default TimeZone to use for formatting.
     * Default value used is UTC (NOT default TimeZone of JVM).
     */
    public ObjectMapper setTimeZone(TimeZone tz) {
        _deserializationConfig = _deserializationConfig.with(tz);
        _serializationConfig = _serializationConfig.with(tz);
        return this;
    }

即默认使用UTC，不会默认使用JVM的TimeZone

所以可以作出以下修改

spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8