验证每个月的最大天数如下：
|
1
|
Calendar
.
getInstance
(
)
.
getActualMaximum
(
Calendar
.
DAY_OF_MONTH
)
;
|
使用Java正则表达式匹配一个时间格式的字符串
|
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|
import
java
.
util
.
regex
.
Matcher
;
import
java
.
util
.
regex
.
Pattern
;
public
class
TimeUtil
{
/**
* 验证时间字符串格式输入是否正确
* @param timeStr
* @return
*/
public
static
boolean
valiDateTimeWithLongFormat
(
String
timeStr
)
{
String
format
=
"((19|20)[0-9]{2})-(0?[1-9]|1[012])-(0?[1-9]|[12][0-9]|3[01]) "
+
"([01]?[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]"
;
Pattern
pattern
=
Pattern
.
compile
(
format
)
;
Matcher
matcher
=
pattern
.
matcher
(
timeStr
)
;
if
(
matcher
.
matches
(
)
)
{
pattern
=
Pattern
.
compile
(
"(\\d{4})-(\\d+)-(\\d+).*"
)
;
matcher
=
pattern
.
matcher
(
timeStr
)
;
if
(
matcher
.
matches
(
)
)
{
int
y
=
Integer
.
valueOf
(
matcher
.
group
(
1
)
)
;
int
m
=
Integer
.
valueOf
(
matcher
.
group
(
2
)
)
;
int
d
=
Integer
.
valueOf
(
matcher
.
group
(
3
)
)
;
if
(
d
>
28
)
{
Calendar
c
=
Calendar
.
getInstance
(
)
;
c
.
set
(
y
,
m
-
1
,
1
)
;
int
lastDay
=
c
.
getActualMaximum
(
Calendar
.
DAY_OF_MONTH
)
;
return
(
lastDay
>=
d
)
;
}
}
return
true
;
}
return
false
;
}
public
static
void
main
(
String
[
]
args
)
{
System
.
out
.
println
(
TimeUtil
.
valiDateTimeWithLongFormat
(
"2016-5-2 08:02:02"
)
)
;
System
.
out
.
println
(
TimeUtil
.
valiDateTimeWithLongFormat
(
"2016-02-29 08:02:02"
)
)
;
System
.
out
.
println
(
TimeUtil
.
valiDateTimeWithLongFormat
(
"2015-02-29 08:02:02"
)
)
;
System
.
out
.
println
(
TimeUtil
.
valiDateTimeWithLongFormat
(
"2016-02-02 082:02"
)
)
;
}
}
|
输出
|
1
2
3
4
|
true
true
false
false
|