Jackson序列化与反序列化LocalDateTime、TimeStamp 等时间类型参数报错

场景：
实体类Entity 部分属性：

 /**
     * 创建时间
     */
    @Column(name = "gmt_create")
    protected Timestamp gmtCreate;
    /**
     * 修改时间
     */
    @Column(name = "gmt_modified")
    protected Timestamp gmtModified;

controller层采用实体类接收参数：

    @PostMapping("/testFeign")
    public void testFeign(@RequestBody JourneyEntity journeyEntity) {
         //业务代码
    }

Postman 发起post请求：
参数如下：
{
“journeyId”:“fd96adc11d6d4e11a0c184297dbedc98”,
“name”:“测试版本下线”,
“version”:“3”,
“maxVersion”:“4”,
“audience”:“CROWD”,
“type”:“service”,
“gmtCreate”:“2020-05-27 10:59:40”,–字符串类型参数
“conflictResolution”:“concurrent”,
“layoutContent”:“hhhhh”,
“policyDelivery”:"{‘type’:‘IMMEDIATELY’}"
}

结果报错如下：

Caused by: com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.sql.Timestamp` from String "2020-05-27 10:59:40": not a valid representation (error: Failed to parse Date value '2020-05-27 10:59:40': Cannot parse date "2020-05-27 10:59:40": while it seems to fit format 'yyyy-MM-dd'T'HH:mm:ss.SSSZ', parsing fails (leniency? null))
 at [Source: (PushbackInputStream); line: 8, column: 14] (through reference chain: com.aliyun.opaas.journey.dal.entity.JourneyEntity["gmtCreate"])
	at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:67)
	at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:1549)
	at com.fasterxml.jackson.databind.DeserializationContext.handleWeirdStringValue(DeserializationContext.java:911)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:524)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseDate(StdDeserializer.java:467)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$DateBasedDeserializer._parseDate(DateDeserializers.java:195)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$TimestampDeserializer.deserialize(DateDeserializers.java:335)
	at com.fasterxml.jackson.databind.deser.std.DateDeserializers$TimestampDeserializer.deserialize(DateDeserializers.java:320)
	at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:127)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:369)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3084)
	at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:239)
	... 66 more

异常处可明显看到，将String 反序列化成Timestamp类型时报错，反序列化用的格式是：
yyyy-MM-dd’T’HH:mm:ss.SSSZ，而String的格式是：yyyy-MM-dd HH:mm:ss

解决办法：

1. 全局解决：
   设置WebMvcConfigurer 中的ObjectMapper的时间转换类型，并注入HttpMessageConverter中

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder;

     @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        ObjectMapper mapper = jackson2ObjectMapperBuilder.build();
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        converters.add(0, new MappingJackson2HttpMessageConverter(mapper));
    }
}

2. 针对属性解决：
   添加注解@JsonFormat(pattern = “yyyy-MM-dd HH:mm:ss”, timezone=“GMT+8”)

    @Column(name = "gmt_create")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",  timezone="GMT+8")
    protected Timestamp gmtCreate;

这样可保证不会影响全局，只针对单个属性进行json转换

3. 添加spring关于jackson的属性配置(试了后，我的环境上并没有生效，如有建议欢迎提出，一起成长)
   application.properties 配置文件添加

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

不生效原因：
WebMvcConfigurer 配置类里已经设置了new MappingJackson2HttpMessageConverter()

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        /*ObjectMapper mapper = jackson2ObjectMapperBuilder.build();
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));*/
        /**
        *此处已经设置了MappingJackson2HttpMessageConverter jackson转换器，但是未设置任何转换格式，所以当需要反序列化String类型为Timestamp类型时，
        用的格式仍然Jackson默认的类型格式-yyyy-MM-dd'T'HH:mm:ss.SSSZ，
        导致反序列化失败，报错，而且此处设置便会覆盖配置文件的 jackson的配置项，配置一直不生效的原因就是这里
        **/
        converters.add(0, new MappingJackson2HttpMessageConverter());
    }

解决办法就是：有此处设置MappingJackson2HttpMessageConverter 时，只能由此处指定了date-format转换格式才能有效，如上代码中，ObjectMapper 来设置dateFormat

        ObjectMapper mapper = jackson2ObjectMapperBuilder.build();
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        /**
        *此处已经设置了MappingJackson2HttpMessageConverter jackson转换器，但是未设置任何转换格式，所以当需要反序列化String类型为Timestamp类型时，
        用的格式仍然Jackson默认的类型格式-yyyy-MM-dd'T'HH:mm:ss.SSSZ，
        导致反序列化失败，报错，而且此处设置便会覆盖配置文件的 jackson的配置项，配置一直不生效的原因就是这里
        **/
        converters.add(0, new MappingJackson2HttpMessageConverter(mapper));