SpringBoot中 Jackson 日期的时区和日期格式问题解决

 show variables like "%time_zone%";

+------------------+--------+
| Variable_name  | Value |
+------------------+--------+
| system_time_zone | CST  |
| time_zone    | SYSTEM |
+------------------+--------+
2 rows in set (0.00 sec)
#time_zone说明mysql使用system的时区，system_time_zone说明system使用CST时区

 set global time_zone = '+8:00'; ##修改mysql全局时区为北京时间，即我们所在的东8区
> set time_zone = '+8:00'; ##修改当前会话时区
> flush privileges; #立即生效

/**
 * Value that indicates that default {@link java.util.TimeZone}
 * (from deserialization or serialization context) should be used:
 * annotation does not define value to use.
 *<p>
 * NOTE: default here does NOT mean JVM defaults but Jackson databindings
 * default, usually UTC, but may be changed on <code>ObjectMapper</code>.
 */
public final static String DEFAULT_TIMEZONE = "##default";
 
值，该值指示默认{@链接java.util.TimeZone}
 
（来自反序列化或序列化上下文）应使用：
 
注释未定义要使用的值。
 
注意：这里的默认值并不意味着JVM默认值，而是Jackson数据绑定。
 
默认值，通常为UTC，但可以在<code>objectmapper<code>上更改。

@NotNull
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
@JsonProperty("start_time")
private Date startTime;

@Bean
    public Jackson2ObjectMapperBuilderCustomizer jacksonObjectMapperCustomization() {
        return jacksonObjectMapperBuilder ->
                jacksonObjectMapperBuilder.timeZone(TimeZone.getTimeZone("GMT+8"));
    }

spring.jackson.default-property-inclusion=NON_NULL
spring.jackson.time-zone=GMT+8
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss