Spring Boot 將yyyy-MM-dd格式的文字字串直接轉換為LocalDateTime出現的問題

問題復現

Exception in thread "main" java.time.format.DateTimeParseException: Text '2020-03-12' could not be parsed: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2020-03-12 of type java.time.format.Parsed
at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1920)

at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1855)
at java.time.LocalDateTime.parse(LocalDateTime.java:492)
at demo.LocalDateTimeUtils.parseString(LocalDateTimeUtils.java:22)
at demo.DateTimeDemo.main(DateTimeDemo.java:12)
Caused by: java.time.DateTimeException: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2020-03-12 of type java.time.format.Parsed

at java.time.LocalDateTime.from(LocalDateTime.java:461)
at java.time.format.Parsed.query(Parsed.java:226)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
... 3 more
Caused by: java.time.DateTimeException: Unable to obtain LocalTime from TemporalAccessor: {},ISO resolved to 2020-03-12 of type java.time.format.Parsed

at java.time.LocalTime.from(LocalTime.java:409)
at java.time.LocalDateTime.from(LocalDateTime.java:457)
... 5 more

問題解決

解決方案：先將文字字串日期轉化為LocalDate型別，再將LocalDate轉化為LocalDateTime

LocalDateTimeUtils.parseStringToLocalDateTime(
    couponForm.getStartTime(),DateTimeFormatPatternConstants.YYYY_MM_DD)

/**
 * 解析字串為日期
 * <p>
 * 說明：
 * 1. 該方法主要解決yyyy-MM-dd格式文字字串無法直接轉換為LocalDateTime的問題
 *
 * @param source  需要解析的日期字串
 * @param formatPattern 日期格式化模式
 * @return 格式化後的日期
 */
public static LocalDateTime parseStringToLocalDateTime(String source,String formatPattern) {
 DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formatPattern);
 LocalDate localDate = LocalDate.parse(source,dateTimeFormatter);
 return localDate.atStartOfDay();
}

java.time.LocalDate.atStartOfDay()方法將此日期與午夜時間組合在一起，以便在此日期開始時建立LocalDateTime

可參考文件

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