Spring Boot 将yyyy-MM-dd格式的文本字符串直接转换为LocalDateTime出现的问题

问题复现

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
 

问题解决

解决方案：先将文本字符串日期转化为LocalDate类型，再将LocalDate转化为LocalDateTime

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

/**
 * 解析字符串为日期
 * <p>
 * 说明：
 * 1. 该方法主要解决yyyy-MM-dd格式文本字符串无法直接转换为LocalDateTime的问题
 *
 * @param source  需要解析的日期字符串
 * @param formatPattern 日期格式化模式
 * @return 格式化后的日期
 */
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()方法将此日期与午夜时间组合在一起，以便在此日期开始时创建LocalDateTime

可参考文档

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