有没有办法将日期String
转换为格式为LocalDateTime
的{{1}}?
如果我试试这个:
"yyyy-MM-dd"
我遇到了这个例外:
DateTimeFormatter DATEFORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime ldt = LocalDateTime.parse(string, DATEFORMATTER);
我知道主要问题,即模式不包含小时和分钟..
但是,如果我想创建一个获得java.time.format.DateTimeParseException: Text '2017-03-13' could not be parsed: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2017-03-13 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 hu.npsh.workforce.utils.Util.stringToLocalDateTime(Util.java:284)
at hu.npsh.workforce.utils.util.StringLocalDateTimeConversionTest.stringToLocalDateTimeTest(StringLocalDateTimeConversionTest.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.time.DateTimeException: Unable to obtain LocalDateTime from TemporalAccessor: {},ISO resolved to 2017-03-13 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)
... 26 more
Caused by: java.time.DateTimeException: Unable to obtain LocalTime from TemporalAccessor: {},ISO resolved to 2017-03-13 of type java.time.format.Parsed
at java.time.LocalTime.from(LocalTime.java:409)
at java.time.LocalDateTime.from(LocalDateTime.java:457)
... 28 more
和String
的方法,并希望以DateTimeFormatter
是否有正确,好的解决方案?
修改
我的目标是制作一个获得LocalDateTime
和String
的方法
并返回DateTimeFormatter
。
模式可以是任何东西(什么是有效的)。
答案 0 :(得分:25)
使用LocalDate
创建localDate,然后您可以根据需要添加时间段:
DateTimeFormatter DATEFORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate ld = LocalDate.parse("2017-03-13", DATEFORMATTER);
LocalDateTime ldt = LocalDateTime.of(ld, LocalDateTime.now().toLocalTime());
System.out.println(ldt);
ldt = LocalDateTime.of(ld, LocalDateTime.MIN.toLocalTime());
如果你只需要一个空的时段
编辑:
使用此解决方案,您可以构建动态解析器:
DateTimeFormatter DATEFORMATTER1 = DateTimeFormatter.ofPattern("yyyy-MM-dd");
DateTimeFormatter DATEFORMATTER = new DateTimeFormatterBuilder().append(DATEFORMATTER1)
.parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
.parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
.parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
.toFormatter();
//DateTimeFormatter DATEFORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime ldt = LocalDateTime.parse("2017-03-13", DATEFORMATTER);
答案 1 :(得分:16)
您无法将“2017-03-13”转换为LocalDateTime
,因为字符串中没有时间信息,只有日期。您可以将其转换为LocalDate
DateTimeFormatter dateformatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDate ld = LocalDate.parse("2017-03-13", dateformatter);
在此之后我们可以将其转换为LocalDateTime
LocalDateTime ldt = ld.atStartOfDay();
答案 2 :(得分:0)
您可以使用以下时间开始:
LocalDate.parse("2017-10-18", DateTimeFormatter.ofPattern("yyyy-MM-dd"))
.atStartOfDay().atOffset(ZoneOffset.UTC).format(DateTimeFormatter.ISO_DATE_TIME)
在一天结束时,您可以使用:
LocalDate.parse("2017-10-18", DateTimeFormatter.ofPattern("yyyy-MM-dd"))
.atStartOfDay().plusHours(23).plusMinutes(59).plusSeconds(59).atOffset(ZoneOffset.UTC).format(DateTimeFormatter.ISO_DATE_TIME)
对于localDateTime,您可以使用:
LocalDate.parse("2017-10-18", DateTimeFormatter.ofPattern("yyyy-MM-dd")).atTime(LocalTime.now())
.atOffset(ZoneOffset.UTC).format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss'Z'"))
<强>结果:强>
2017-10-18T00:00:00Z
2017-10-18T23:59:59Z
2017-10-18T14:45:35Z
答案 3 :(得分:0)
一个班轮怎么样?
LocalDateTime.parse("2017-03-13" + " 00:00", DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm"));
答案 4 :(得分:0)
如果字符串中的日期格式为“ yyyyMMdd”,并且想要转换为localDate,则请按照以下步骤操作:
public static void processDate() {
DateTimeFormatter DATEFORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd");
LocalDate ld = LocalDate.parse("20200511", DATEFORMATTER);
System.out.println(ld.toString());
}
输出为“ yyyy-MM-dd”格式:
2020-05-11
答案 5 :(得分:-1)
使用 Joda-Time-XX.jar ,它有 DateTimeFormatter 来转换日期时间格式。您可以提供日期时间(yyyy-MM-dd HH:mm:ss格式)或仅提供日期。在这两种情况下,您都会得到日期和时间。
DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd");
DateTime dateTime = dateTimeFormatter.parseDateTime(date);