Java8- ZonedDateTime，DateTimeFormatter无法识别格式 [英] Java8- ZonedDateTime with DateTimeFormatter not recognizing the format

问题描述

我正在使用ZonedDateTime和Java 8的DateTimeFormatter。当我尝试解析自己的模式时，它无法识别并抛出异常。

I am using the ZonedDateTime with DateTimeFormatter of Java 8. When I try to parse my own pattern it doesn't recognizes and throws an exception.

    String oraceDt = "1970-01-01 00:00:00.0";
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S");
    ZonedDateTime dt = ZonedDateTime.parse(oraceDt, formatter);

Exception in thread "main" java.time.format.DateTimeParseException: Text '1970-01-01 00:00:00.0' could not be parsed: Unable to obtain ZonedDateTime from TemporalAccessor: {},ISO resolved to 1970-01-01T00:00 of type java.time.format.Parsed
at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1918)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1853)
at java.time.ZonedDateTime.parse(ZonedDateTime.java:597)
at com.timezone.Java8DsteTimes.testZonedDateTime(Java8DsteTimes.java:31)
at com.timezone.Java8DsteTimes.main(Java8DsteTimes.java:11)

引起： java.time.DateTimeException：无法从TemporalAccessor获取ZonedDateTime：{}，ISO解析为1970-01-01T00：00类型java.time.format.Parsed

Caused by: java.time.DateTimeException: Unable to obtain ZonedDateTime from TemporalAccessor: {},ISO resolved to 1970-01-01T00:00 of type java.time.format.Parsed

推荐答案

嗯，你想要创建一个 ZonedDateTime ，它总是引用一个时区，但你的输入不包含这样的如果输入缺少区域，您也没有指示格式化程序使用默认时区。您的问题有两种解决方案：

Well, you want to create a ZonedDateTime which always refers to a timezone but your input does not contain such an information, and you have also not instructed your formatter to use a default timezone if the input is missing a zone. There are two solutions for your problem:

1. 指示您的解析器使用时区（此处使用系统tz作为例）：

String oraceDt = "1970-01-01 00:00:00.0";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S");
ZonedDateTime zdt = 
  ZonedDateTime.parse(oraceDt, formatter.withZone(ZoneId.systemDefault()));
System.out.println(zdt); // in my default zone => 1970-01-01T00:00+01:00[Europe/Berlin]

使用不需要时区的其他结果类型（此处 LocalDateTime ）：

Use another result type which does not need a timezone (here LocalDateTime):

String oraceDt = "1970-01-01 00:00:00.0";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.S");
LocalDateTime ldt = LocalDateTime.parse(oraceDt, formatter);
System.out.println(ldt); // 1970-01-01T00:00

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