Spring Boot Jackson 如何全局设置序列化 Instant？

[JasonLaw]

现在我是使用@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")将 Instant 序列化为字符串的，但是每个地方都要加上。有没有全局设置的方法呢？

@Configuration
public class JacksonConfig {

    private static final DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneId.systemDefault());

    /**
     * https://stackoverflow.com/questions/45662820/how-to-set-format-of-string-for-java-time-instant-using-objectmapper
     */
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return jacksonObjectMapperBuilder ->
                jacksonObjectMapperBuilder.serializerByType(Instant.class, new JsonSerializer<Instant>() {
                    @Override
                    public void serialize(Instant value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
                        String str = fmt.format(value);
                        gen.writeString(str);
                    }
                });
    }
}

[wolfie]

spring.jackson.date-format：
或者 自定义 @Bean Jackson2ObjectMapperBuilderCustomizer

[clf]

下方省略号部分自己填入序列化逻辑。
```
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
Jackson2ObjectMapperBuilderCustomizer cunstomizer = new Jackson2ObjectMapperBuilderCustomizer() {

@Override
public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {

jacksonObjectMapperBuilder.serializerByType(Instant.TYPE, ……);
jacksonObjectMapperBuilder.serializerByType(Instant.class, ……);

}
};
return cunstomizer;
}
```

[arthas2234]

配置文件里面添加
spring:
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8

[JasonLaw]

@wolfie #1
@arthas2234 #3

spring.jackson.date-format 是没有用的。 - https://stackoverflow.com/questions/43622259/how-to-use-spring-boots-spring-jackson-date-format-property

[wolfie]

@JasonLaw #4
看懂为什么没用了么，就说没用。

[JasonLaw]

@wolfie #5 那个链接中的内容已经说了，你的意思是？