关于 localDateTime 返回前端的格式问题

V2EX = way to explore

V2EX 是一个关于分享和探索的地方

现在注册

已注册用户请登录

这是一个创建于 1983 天前的主题，其中的信息可能已经有所发展或是发生改变。

"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

格式

dayofweek

izer

chronology

25 条回复 • 2020-12-10 16:00:28 +08:00

wu67

2019-07-15 16:54:18 +08:00

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

2019-07-15 17:01:12 +08:00

问题有很多种解决办法，没看懂你的选择

honeycomb

2019-07-15 17:05:09 +08:00 via Android

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

broadliyn

2019-07-15 17:09:59 +08:00

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

2019-07-15 17:10:36 +08:00

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

scyllaEo

2019-07-15 17:16:46 +08:00

@yinzhili 要做统一处理，这样一个一个加就有点麻烦

scyllaEo

2019-07-15 17:17:19 +08:00

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

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

cyheng

2019-07-15 17:19:36 +08:00

objectMapper addDeserializer 试一下？

xfriday

2019-07-15 17:39:15 +08:00

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

2019-07-15 17:40:56 +08:00

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

npe

2019-07-15 17:43:46 +08:00

@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

2019-07-15 17:44:07 +08:00

``` 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

2019-07-15 18:43:49 +08:00

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

2019-07-15 18:46:09 +08:00

或者重新 configureMessageConverters 这个方法

FleyX

2019-07-15 18:48:26 +08:00

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

2019-07-15 19:15:24 +08:00

@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());
}

}