Question

我正在尝试解析日期时间戳并仅提取日期。像这样：

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

class FormatterMain {
    public static void main(String[] args) {
        DateTimeFormatter formatter =
            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssz");
        System.out.println(LocalDate.parse("2020-10-14T10:00:00Z", formatter));
    }
}

但这会导致以下异常：

Exception in thread "main" java.time.format.DateTimeParseException: Text '2020-10-14T10:00:00Z' could not be parsed: null
    at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:2017)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1952)
    at java.base/java.time.LocalDate.parse(LocalDate.java:428)
    at FormatterMain.main(FormatterMain.java:8)
Caused by: java.lang.NullPointerException
    at java.base/java.time.format.DateTimeFormatterBuilder$PrefixTree.prefixLength(DateTimeFormatterBuilder.java:4527)
    at java.base/java.time.format.DateTimeFormatterBuilder$PrefixTree.add0(DateTimeFormatterBuilder.java:4396)
    at java.base/java.time.format.DateTimeFormatterBuilder$PrefixTree.add(DateTimeFormatterBuilder.java:4391)
    at java.base/java.time.format.DateTimeFormatterBuilder$ZoneTextPrinterParser.getTree(DateTimeFormatterBuilder.java:4138)
    at java.base/java.time.format.DateTimeFormatterBuilder$ZoneIdPrinterParser.parse(DateTimeFormatterBuilder.java:4249)
    at java.base/java.time.format.DateTimeFormatterBuilder$CompositePrinterParser.parse(DateTimeFormatterBuilder.java:2370)
    at java.base/java.time.format.DateTimeFormatter.parseUnresolved0(DateTimeFormatter.java:2107)
    at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2036)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
    ... 2 more

这似乎与以下问题有关：https://bugs.openjdk.java.net/browse/JDK-8226704。但是我堆栈中的行号与问题中的行号不匹配。感谢所有可能出问题的指针。

PS：

$ java -version
openjdk version "11.0.7" 2020-04-14 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.7+10-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.7+10-LTS, mixed mode, sharing)

Answer 1

时间戳字符串末尾的“ Z”？您可以在模式字符串中使用X来实现。不是z。格式字符串中的小写z表示“时区名称”，并与PST或Pacific Standard Time之类的内容匹配。

X是缩短的区域偏移。像-08或Z之类的东西。

LocalDate.parse导致“ DateTimeParseException ...无法解析：null”

1 个答案: