关于 localDateTime 返回前端的格式问题

[scyllaEo]

"createTime": {
        "dayOfMonth": 15,
        "dayOfWeek": "MONDAY",
        "dayOfYear": 196,
        "month": "JULY",
        "year": 2019,
        "monthValue": 7,
        "hour": 14,
        "minute": 50,
        "nano": 0,
        "second": 40,
        "chronology": {
          "id": "ISO",
          "calendarType": "iso8601"
        }
      }

上述就是返回的格式。请问这是为啥,已经在 WebMvcConfigurer 配置了 pattern,并且注册到容器了。

@Bean
public LocalDateTimeSerializer localDateTimeDeserializer() {
   return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }

//注册
builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());

有没有人解答一下

[wu67]

exm? 你的意思是要让前端显示 yyyy-MM-dd HH:mm:ss 这样? 直接把 long 丢过去让前端处理呀

[telami]

问题有很多种解决办法，没看懂你的选择

[honeycomb]

@wu67 他要让 mvc 的序列化机制直接把 LocalDateTime 转成 String

[broadliyn]

1. 看你前段返回时候序列化是用的 spring boot 自带的，还是自己另外建的 JsonUtil
2. builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer()); 这个 builder 的来源是 1 里的哪一个？

[yinzhili]

字段上面加注解：
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonSerialize(using = LocalDateTimeSerializer.class)

[scyllaEo]

@yinzhili 要做统一处理，这样一个一个加就有点麻烦

[scyllaEo]

@broadliyn ``` @Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {

return builder -> {
builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());
};
```

[cyheng]

objectMapper addDeserializer 试一下？

[xfriday]

用 RFC3339 （"2006-01-02T15:04:05Z07:00"），带上时区信息，方便前端做国际化处理

[broadliyn]

看一下，MappingJackson2HttpMessageConverter 和 JacksonAutoConfiguration
目测是配置没有生效。

[npe]

@Configuration
public class ApiConfiguration implements WebMvcConfigurer {


@Override
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
configurer.defaultContentType(MediaType.APPLICATION_JSON_UTF8);
}

private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

@Bean
public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
return builder -> {
builder.simpleDateFormat(DATE_TIME_FORMAT);
builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern(DATE_FORMAT)));
builder.serializers(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
};
}


}

[npe]

``` Java

@Configuration
public class ApiConfiguration implements WebMvcConfigurer {


@Override
public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
configurer.defaultContentType(MediaType.APPLICATION_JSON_UTF8);
}

private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";

@Bean
public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
return builder -> {
builder.simpleDateFormat(DATE_TIME_FORMAT);
builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern(DATE_FORMAT)));
builder.serializers(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DATE_TIME_FORMAT)));
};
}


}

```

[liuawei]

配置文件里面配置这个看下
spring.mvc.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8

[liuawei]

或者重新 configureMessageConverters 这个方法

[FleyX]

关于时间的前后端交互问题，从来都是用的时间戳。客户端可以格式化为任意格式。也不存在时区转换问题。

[zhady009]

@Configuration
public class LocalDateTimeFormatter {

@Bean
public LocalDateTimeSerializer localDateTimeDeserializer() {
return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DateFormat.NORMAL_DATE));
}

@Bean
public LocalDateSerializer localDateDeserializer() {
return new LocalDateSerializer(DateTimeFormatter.ofPattern(DateFormat.SHORT_DATE));
}

@Bean
public LocalTimeSerializer localTimeDeserializer() {
return new LocalTimeSerializer(DateTimeFormatter.ofPattern(DateFormat.NORMAL_TIME));
}

@Bean
public Jackson2ObjectMapperBuilderCustomizer localDateTimeDeserializerCustomizer() {
return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());
}

@Bean
public Jackson2ObjectMapperBuilderCustomizer localDateDeserializerCustomizer() {
return builder -> builder.serializerByType(LocalDate.class, localDateDeserializer());
}

@Bean
public Jackson2ObjectMapperBuilderCustomizer localTimeDeserializerCustomizer() {
return builder -> builder.serializerByType(LocalTime.class, localTimeDeserializer());
}

}

[alangz]

如果用的是 Jackson，你需要配置加载 jsr310 的 JavaTimeModule 模块儿，并配置关闭 WRITE_DATES_AS_TIMESTAMPS。

[alangz]

补充下，看到你这个返回结果就是没有添加这个模块儿。

[qiyuey]

建议走 ISO 标准格式，就是带 T 的那个

[WispZhan]

请你返回时间戳谢谢。