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SpringBoot如何對LocalDateTime進(jìn)行格式化并解析

 更新時間：2022年07月04日 14:48:14   作者：流煙默  
這篇文章主要介紹了SpringBoot如何對LocalDateTime進(jìn)行格式化方式，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

【1】格式化后臺傳給前端的日期

首先第一點(diǎn)需要知道的是springboot默認(rèn)依賴的json框架是jackson。

當(dāng)使用@ResponseBody注解返回json格式數(shù)據(jù)時就是該框架在起作用。

SpringBoot對Date/DateTime配置

如果字段屬性是Date而非LocalDateTime時，通常我們會在application.properties里面配置如下：

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
spring.jackson.serialization.write-dates-as-timestamps=false

如下圖所示，spring.jackson開頭的配置會被JacksonProperties類獲取進(jìn)行使用。

當(dāng)返回json格式的時候，Jackson就會根據(jù)配置文件中日期格式化的配置對結(jié)果進(jìn)行處理。

但是如果字段屬性為LocalDateTime呢？這種配置就失去了作用。

第一種方式：配置localDateTimeSerializer

這時候建議配置如下：

/**
 * Created by jianggc at 2020/7/1.
 */
@Configuration
public class LocalDateTimeSerializerConfig {
    @Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
    private String pattern;
    // localDateTime 序列化器
    @Bean
    public LocalDateTimeSerializer localDateTimeSerializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
    }
    // localDateTime 反序列化器
    @Bean
    public LocalDateTimeDeserializer localDateTimeDeserializer() {
        return new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(pattern));
    }
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
//        return new Jackson2ObjectMapperBuilderCustomizer() {
//            @Override
//            public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
                jacksonObjectMapperBuilder.featuresToDisable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
//                jacksonObjectMapperBuilder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
//                jacksonObjectMapperBuilder.deserializerByType(LocalDateTime.class,localDateTimeDeserializer());
//            }
//        };
        //這種方式同上
        return builder -> {
            builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
            builder.deserializerByType(LocalDateTime.class,localDateTimeDeserializer());
            builder.simpleDateFormat(pattern);
        };
    }
}

第二種方式：@JsonFormat

這種配置方式自然是全局的，如果想針對某個字段特殊處理，可以在類字段上面添加注解@JsonFormat：

    @JsonFormat( pattern = "yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
    private Date createdDate;
    
    @JsonFormat( pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime createdTime;

【2】前臺傳String格式日期給后臺

如下所示，前臺傳參2020-08-30 11:11:11，后臺使用LocalDateTime 接收。

通常會報錯類似如下：

nested exception is org.springframework.core.convert.ConversionFailedException: 

Failed to convert from type [java.lang.String] to type [java.time.LocalDateTime ]

很顯然是在參數(shù)綁定的時候沒有找到合適的轉(zhuǎn)換器把String轉(zhuǎn)換為對應(yīng)的格式。

① 配置全局的日期轉(zhuǎn)換器localDateTimeConvert

@Bean
public Converter<String, LocalDateTime> localDateTimeConvert() {
    return new Converter<String, LocalDateTime>() {
        @Override
        public LocalDateTime convert(String source) {
            DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
            LocalDateTime dateTime = null;
            try {
                //2020-01-01 00:00:00
                switch (source.length()){
                    case 10:
                        logger.debug("傳過來的是日期格式：{}",source);
                        source=source+" 00:00:00";
                        break;
                    case 13:
                        logger.debug("傳過來的是日期 小時格式：{}",source);
                        source=source+":00:00";
                        break;
                    case 16:
                        logger.debug("傳過來的是日期 小時:分鐘格式：{}",source);
                        source=source+":00";
                        break;
                }
                dateTime = LocalDateTime.parse(source, df);
            } catch (Exception e) {
               logger.error(e.getMessage(),e);
            }
            return dateTime;
        }
    };
}

實(shí)現(xiàn)原理簡要描述

在進(jìn)行參數(shù)綁定的時候，會使用WebDataBinder對象。而創(chuàng)建WebDataBinder對象時，會遍歷DefaultDataBinderFactory.initializer，使用其WebBindingInitializer initializer對WebDataBinder對象進(jìn)行初始化。

初始化方法具體可見ConfigurableWebBindingInitializer.initBinder(WebDataBinder binder)，源碼如下：

 public void initBinder(WebDataBinder binder) {
        binder.setAutoGrowNestedPaths(this.autoGrowNestedPaths);
        if (this.directFieldAccess) {
            binder.initDirectFieldAccess();
        }
        //設(shè)置messageCodesResolver
        if (this.messageCodesResolver != null) {
            binder.setMessageCodesResolver(this.messageCodesResolver);
        }
        //設(shè)置bindingErrorProcessor
        if (this.bindingErrorProcessor != null) {
            binder.setBindingErrorProcessor(this.bindingErrorProcessor);
        }
        //設(shè)置validator
        if (this.validator != null && binder.getTarget() != null && this.validator.supports(binder.getTarget().getClass())) {
            binder.setValidator(this.validator);
        }
        //設(shè)置conversionService
        if (this.conversionService != null) {
            binder.setConversionService(this.conversionService);
        }
        if (this.propertyEditorRegistrars != null) {
            PropertyEditorRegistrar[] var2 = this.propertyEditorRegistrars;
            int var3 = var2.length;
            for(int var4 = 0; var4 < var3; ++var4) {
                PropertyEditorRegistrar propertyEditorRegistrar = var2[var4];
                propertyEditorRegistrar.registerCustomEditors(binder);
            }
        }
    }

而conversionService中包含了許多的convert-類型格式化器。在WebDataBinder進(jìn)行參數(shù)綁定的時候就會使用不同的格式化器即不同的convert進(jìn)行參數(shù)類型轉(zhuǎn)換。

關(guān)于參數(shù)綁定的過程，有興趣的可以跟蹤DataBinder.doBind方法，在這個過程中會對前臺傳輸?shù)闹颠M(jìn)行類型轉(zhuǎn)換為目標(biāo)參數(shù)需要的類型。自定義的localDateTimeConvert也是在這里被用到的。

如下所示前臺傳String格式給后臺參數(shù)endDate，參數(shù)類型為java.time.LocalDateTime。

找到我們自定義的converter

調(diào)用convert進(jìn)行類型轉(zhuǎn)換：

可以看到轉(zhuǎn)換后的結(jié)果為：

② 配置日期格式化器

/**
  * yyyy-MM-dd HH:mm:ss String-localDateTime
  * @return
  */
 @Bean
 public Formatter<LocalDateTime> localDateTimeFormatter() {
     return new Formatter<LocalDateTime>() {
         @Override
         public LocalDateTime parse(String text, Locale locale) throws ParseException {
             return LocalDateTime.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
         }
         @Override
         public String print(LocalDateTime localDateTime, Locale locale) {
             DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
             return formatter.format(localDateTime);
         }
     };
 }

自定義的格式化器會在SpringBoot啟動時自動化配置過程中被加入，具體可以參考如下代碼。

WebMvcAutoConfiguration.mvcConversionService：

@Bean
@Override
public FormattingConversionService mvcConversionService() {
	WebConversionService conversionService = new WebConversionService(this.mvcProperties.getDateFormat());
	addFormatters(conversionService);
	return conversionService;
}

【3】convert是什么時候添加到ConversionService中的？

① SpringBoot啟動的時候運(yùn)行run方法

其會走到SpringApplication.configureEnvironment方法處：

   protected void configureEnvironment(ConfigurableEnvironment environment, String[] args) {
        if (this.addConversionService) {
        //從這里跟蹤
            ConversionService conversionService = ApplicationConversionService.getSharedInstance();
            environment.setConversionService((ConfigurableConversionService)conversionService);
        }
        this.configurePropertySources(environment, args);
        this.configureProfiles(environment, args);
    }

② 嘗試獲取ConversionService

ApplicationConversionService.getSharedInstance如下所示，這里可以看到其使用了設(shè)計模式中的懶漢式之雙重校驗(yàn)鎖來獲取單例。

public static ConversionService getSharedInstance() {
      ApplicationConversionService sharedInstance = sharedInstance;
      if (sharedInstance == null) {
          Class var1 = ApplicationConversionService.class;
          synchronized(ApplicationConversionService.class) {
              sharedInstance = sharedInstance;
              if (sharedInstance == null) {
                  sharedInstance = new ApplicationConversionService();
                  sharedInstance = sharedInstance;
              }
          }
      }
      return sharedInstance;
  }

③ 獲取ApplicationConversionService

繼續(xù)對象創(chuàng)建過程會發(fā)現(xiàn)其走到了configure處：

  public ApplicationConversionService(StringValueResolver embeddedValueResolver) {
        if (embeddedValueResolver != null) {
            this.setEmbeddedValueResolver(embeddedValueResolver);
        }
//我們從這里繼續(xù)跟進(jìn)
        configure(this);
    }

這里我們順帶看一下ApplicationConversionService的類繼承示意圖（其不只是可以作為ConversionService還可以作為ConverterRegistry與FormatterRegistry）：

④ ApplicationConversionService.configure

創(chuàng)建ApplicationConversionService時會對其進(jìn)行配置，這里很重要。其會注入默認(rèn)的Converter和Formatter：

public static void configure(FormatterRegistry registry) {
      DefaultConversionService.addDefaultConverters(registry);
      DefaultFormattingConversionService.addDefaultFormatters(registry);
      addApplicationFormatters(registry);
      addApplicationConverters(registry);
  }

⑤ DefaultConversionService.addDefaultConverters

該方法執(zhí)行完，會添加52個類型轉(zhuǎn)換器：

public static void addDefaultConverters(ConverterRegistry converterRegistry) {
	addScalarConverters(converterRegistry);
	addCollectionConverters(converterRegistry);
	converterRegistry.addConverter(new ByteBufferConverter((ConversionService) converterRegistry));
	converterRegistry.addConverter(new StringToTimeZoneConverter());
	converterRegistry.addConverter(new ZoneIdToTimeZoneConverter());
	converterRegistry.addConverter(new ZonedDateTimeToCalendarConverter());
	converterRegistry.addConverter(new ObjectToObjectConverter());
	converterRegistry.addConverter(new IdToEntityConverter((ConversionService) converterRegistry));
	converterRegistry.addConverter(new FallbackObjectToStringConverter());
	converterRegistry.addConverter(new ObjectToOptionalConverter((ConversionService) converterRegistry));
}

addScalarConverters(converterRegistry);如下所示：

private static void addScalarConverters(ConverterRegistry converterRegistry) {
	converterRegistry.addConverterFactory(new NumberToNumberConverterFactory());
	converterRegistry.addConverterFactory(new StringToNumberConverterFactory());
	converterRegistry.addConverter(Number.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverter(new StringToCharacterConverter());
	converterRegistry.addConverter(Character.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverter(new NumberToCharacterConverter());
	converterRegistry.addConverterFactory(new CharacterToNumberFactory());
	converterRegistry.addConverter(new StringToBooleanConverter());
	converterRegistry.addConverter(Boolean.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverterFactory(new StringToEnumConverterFactory());
	converterRegistry.addConverter(new EnumToStringConverter((ConversionService) converterRegistry));
	converterRegistry.addConverterFactory(new IntegerToEnumConverterFactory());
	converterRegistry.addConverter(new EnumToIntegerConverter((ConversionService) converterRegistry));
	converterRegistry.addConverter(new StringToLocaleConverter());
	converterRegistry.addConverter(Locale.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverter(new StringToCharsetConverter());
	converterRegistry.addConverter(Charset.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverter(new StringToCurrencyConverter());
	converterRegistry.addConverter(Currency.class, String.class, new ObjectToStringConverter());
	converterRegistry.addConverter(new StringToPropertiesConverter());
	converterRegistry.addConverter(new PropertiesToStringConverter());
	converterRegistry.addConverter(new StringToUUIDConverter());
	converterRegistry.addConverter(UUID.class, String.class, new ObjectToStringConverter());
}

這里會添加23個類型轉(zhuǎn)換器：

添加集合處理的類型轉(zhuǎn)換器(這里會添加17個類型轉(zhuǎn)換器)：

public static void addCollectionConverters(ConverterRegistry converterRegistry) {
	ConversionService conversionService = (ConversionService) converterRegistry;
	converterRegistry.addConverter(new ArrayToCollectionConverter(conversionService));
	converterRegistry.addConverter(new CollectionToArrayConverter(conversionService));
	converterRegistry.addConverter(new ArrayToArrayConverter(conversionService));
	converterRegistry.addConverter(new CollectionToCollectionConverter(conversionService));
	converterRegistry.addConverter(new MapToMapConverter(conversionService));
	converterRegistry.addConverter(new ArrayToStringConverter(conversionService));
	converterRegistry.addConverter(new StringToArrayConverter(conversionService));
	converterRegistry.addConverter(new ArrayToObjectConverter(conversionService));
	converterRegistry.addConverter(new ObjectToArrayConverter(conversionService));
	converterRegistry.addConverter(new CollectionToStringConverter(conversionService));
	converterRegistry.addConverter(new StringToCollectionConverter(conversionService));
	converterRegistry.addConverter(new CollectionToObjectConverter(conversionService));
	converterRegistry.addConverter(new ObjectToCollectionConverter(conversionService));
	converterRegistry.addConverter(new StreamConverter(conversionService));
}

⑥ addDefaultFormatters添加格式化器

/**
 * Add formatters appropriate for most environments: including number formatters,
 * JSR-354 Money & Currency formatters, JSR-310 Date-Time and/or Joda-Time formatters,
 * depending on the presence of the corresponding API on the classpath.
 * @param formatterRegistry the service to register default formatters with
 */
public static void addDefaultFormatters(FormatterRegistry formatterRegistry) {
	// Default handling of number values
	formatterRegistry.addFormatterForFieldAnnotation(new NumberFormatAnnotationFormatterFactory());
	// Default handling of monetary values
	if (jsr354Present) {
		formatterRegistry.addFormatter(new CurrencyUnitFormatter());
		formatterRegistry.addFormatter(new MonetaryAmountFormatter());
		formatterRegistry.addFormatterForFieldAnnotation(new Jsr354NumberFormatAnnotationFormatterFactory());
	}
	// Default handling of date-time values
	// just handling JSR-310 specific date and time types
	new DateTimeFormatterRegistrar().registerFormatters(formatterRegistry);
	if (jodaTimePresent) {
		// handles Joda-specific types as well as Date, Calendar, Long
		new JodaTimeFormatterRegistrar().registerFormatters(formatterRegistry);
	}
	else {
		// regular DateFormat-based Date, Calendar, Long converters
		new DateFormatterRegistrar().registerFormatters(formatterRegistry);
	}
}

DateTimeFormatterRegistrar.registerFormatters

@Override
public void registerFormatters(FormatterRegistry registry) {
	DateTimeConverters.registerConverters(registry);
	DateTimeFormatter df = getFormatter(Type.DATE);
	DateTimeFormatter tf = getFormatter(Type.TIME);
	DateTimeFormatter dtf = getFormatter(Type.DATE_TIME);
	// Efficient ISO_LOCAL_* variants for printing since they are twice as fast...
	registry.addFormatterForFieldType(LocalDate.class,
			new TemporalAccessorPrinter(
					df == DateTimeFormatter.ISO_DATE ? DateTimeFormatter.ISO_LOCAL_DATE : df),
			new TemporalAccessorParser(LocalDate.class, df));
	registry.addFormatterForFieldType(LocalTime.class,
			new TemporalAccessorPrinter(
					tf == DateTimeFormatter.ISO_TIME ? DateTimeFormatter.ISO_LOCAL_TIME : tf),
			new TemporalAccessorParser(LocalTime.class, tf));
	registry.addFormatterForFieldType(LocalDateTime.class,
			new TemporalAccessorPrinter(
					dtf == DateTimeFormatter.ISO_DATE_TIME ? DateTimeFormatter.ISO_LOCAL_DATE_TIME : dtf),
			new TemporalAccessorParser(LocalDateTime.class, dtf));
	registry.addFormatterForFieldType(ZonedDateTime.class,
			new TemporalAccessorPrinter(dtf),
			new TemporalAccessorParser(ZonedDateTime.class, dtf));
	registry.addFormatterForFieldType(OffsetDateTime.class,
			new TemporalAccessorPrinter(dtf),
			new TemporalAccessorParser(OffsetDateTime.class, dtf));
	registry.addFormatterForFieldType(OffsetTime.class,
			new TemporalAccessorPrinter(tf),
			new TemporalAccessorParser(OffsetTime.class, tf));
	registry.addFormatterForFieldType(Instant.class, new InstantFormatter());
	registry.addFormatterForFieldType(Period.class, new PeriodFormatter());
	registry.addFormatterForFieldType(Duration.class, new DurationFormatter());
	registry.addFormatterForFieldType(Year.class, new YearFormatter());
	registry.addFormatterForFieldType(Month.class, new MonthFormatter());
	registry.addFormatterForFieldType(YearMonth.class, new YearMonthFormatter());
	registry.addFormatterForFieldType(MonthDay.class, new MonthDayFormatter());
	registry.addFormatterForFieldAnnotation(new Jsr310DateTimeFormatAnnotationFormatterFactory());
}

DateTimeConverters.registerConverters

public static void registerConverters(ConverterRegistry registry) {
	DateFormatterRegistrar.addDateConverters(registry);
	registry.addConverter(new LocalDateTimeToLocalDateConverter());
	registry.addConverter(new LocalDateTimeToLocalTimeConverter());
	registry.addConverter(new ZonedDateTimeToLocalDateConverter());
	registry.addConverter(new ZonedDateTimeToLocalTimeConverter());
	registry.addConverter(new ZonedDateTimeToLocalDateTimeConverter());
	registry.addConverter(new ZonedDateTimeToOffsetDateTimeConverter());
	registry.addConverter(new ZonedDateTimeToInstantConverter());
	registry.addConverter(new OffsetDateTimeToLocalDateConverter());
	registry.addConverter(new OffsetDateTimeToLocalTimeConverter());
	registry.addConverter(new OffsetDateTimeToLocalDateTimeConverter());
	registry.addConverter(new OffsetDateTimeToZonedDateTimeConverter());
	registry.addConverter(new OffsetDateTimeToInstantConverter());
	registry.addConverter(new CalendarToZonedDateTimeConverter());
	registry.addConverter(new CalendarToOffsetDateTimeConverter());
	registry.addConverter(new CalendarToLocalDateConverter());
	registry.addConverter(new CalendarToLocalTimeConverter());
	registry.addConverter(new CalendarToLocalDateTimeConverter());
	registry.addConverter(new CalendarToInstantConverter());
	registry.addConverter(new LongToInstantConverter());
	registry.addConverter(new InstantToLongConverter());
}

DateFormatterRegistrar.addDateConverters

public static void addDateConverters(ConverterRegistry converterRegistry) {
	converterRegistry.addConverter(new DateToLongConverter());
	converterRegistry.addConverter(new DateToCalendarConverter());
	converterRegistry.addConverter(new CalendarToDateConverter());
	converterRegistry.addConverter(new CalendarToLongConverter());
	converterRegistry.addConverter(new LongToDateConverter());
	converterRegistry.addConverter(new LongToCalendarConverter());
}

⑦ addApplicationFormatters(registry)

添加全局格式化器：

   public static void addApplicationFormatters(FormatterRegistry registry) {
        registry.addFormatter(new CharArrayFormatter());
        registry.addFormatter(new InetAddressFormatter());
        registry.addFormatter(new IsoOffsetFormatter());
    }

⑧ addApplicationConverters(registry)

添加全局類型轉(zhuǎn)換器：

public static void addApplicationConverters(ConverterRegistry registry) {
       addDelimitedStringConverters(registry);
       registry.addConverter(new StringToDurationConverter());
       registry.addConverter(new DurationToStringConverter());
       registry.addConverter(new NumberToDurationConverter());
       registry.addConverter(new DurationToNumberConverter());
       registry.addConverter(new StringToDataSizeConverter());
       registry.addConverter(new NumberToDataSizeConverter());
       registry.addConverter(new StringToFileConverter());
       registry.addConverterFactory(new LenientStringToEnumConverterFactory());
       registry.addConverterFactory(new LenientBooleanToEnumConverterFactory());
   }
   public static void addDelimitedStringConverters(ConverterRegistry registry) {
       ConversionService service = (ConversionService)registry;
       registry.addConverter(new ArrayToDelimitedStringConverter(service));
       registry.addConverter(new CollectionToDelimitedStringConverter(service));
       registry.addConverter(new DelimitedStringToArrayConverter(service));
       registry.addConverter(new DelimitedStringToCollectionConverter(service));
   }

以上為個人經(jīng)驗(yàn)，希望能給大家一個參考，也希望大家多多支持腳本之家。 

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