Groovy里的日期处理

Groovy官网的文档：

www.groovy-lang.org/groovy-dev-…

package jerry;

def date = LocalDate.parse('Jun 3, 04', 'MMM d, yy')
assert date == LocalDate.of(2004, Month.JUNE, 3)

def time = LocalTime.parse('4:45', 'H:mm')
assert time == LocalTime.of(4, 45, 0)

def offsetTime = OffsetTime.parse('09:47:51-1234', 'HH:mm:ssZ')
assert offsetTime == OffsetTime.of(9, 47, 51, 0, ZoneOffset.ofHoursMinutes(-12, -34))

def dateTime = ZonedDateTime.parse('2017/07/11 9:47PM Pacific Standard Time', 'yyyy/MM/dd h:mma zzzz')
assert dateTime == ZonedDateTime.of(
        LocalDate.of(2017, 7, 11),
        LocalTime.of(21, 47, 0),
        ZoneId.of('America/Los_Angeles')
)

println 'time check done!'

这段代码无法直接执行，报错误消息：

Caught: groovy.lang.MissingPropertyException: No such property: LocalDate for class: jerry.helloWorld
groovy.lang.MissingPropertyException: No such property: LocalDate for class: jerry.helloWorld
	at jerry.helloWorld.run(helloWorld.groovy:3)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

docs.groovy-lang.org/latest/html…

需要先导入java.time包：

如下图，导入java.time.*之后，Eclipse里的LocalDate，LocalTime都高亮显示了：

官网的代码无法直接运行，需要把所有parse方法的第二个参数，即字符串类型的format:

def date = LocalDate.parse(‘Jun 3, 04’, ‘MMM d, yy’)

全部替换成用方法DateTimeFormatter.ofPattern返回：

package jerry;

import java.time.*
import java.time.format.DateTimeFormatter

CharSequence sequence = 'Jun 3, 04';
java.time.format.DateTimeFormatter formatter = DateTimeFormatter.ofPattern('MMM d, yy');

def date = LocalDate.parse(sequence, formatter)

println( "formatted: " + date.toString())

assert date == LocalDate.of(2004, Month.JUNE, 3)

def time = LocalTime.parse('4:45', DateTimeFormatter.ofPattern('H:mm'))
assert time == LocalTime.of(4, 45, 0)

def offsetTime = OffsetTime.parse('09:47:51-1234', DateTimeFormatter.ofPattern('HH:mm:ssZ'))
assert offsetTime == OffsetTime.of(9, 47, 51, 0, ZoneOffset.ofHoursMinutes(-12, -34))

def dateTime = ZonedDateTime.parse('2017/07/11 9:47PM Pacific Standard Time', DateTimeFormatter.ofPattern('yyyy/MM/dd h:mma zzzz'))
assert dateTime == ZonedDateTime.of(
        LocalDate.of(2017, 7, 11),
        LocalTime.of(21, 47, 0),
        ZoneId.of('America/Los_Angeles')
)

println 'time check done!'

修改后的代码如下：

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