import
java
.
time
.
Instant
;
import
java
.
time
.
LocalDateTime
;
import
java
.
time
.
ZoneOffset
;
import
java
.
time
.
ZonedDateTime
;
import
java
.
time
.
format
.
DateTimeFormatter
;
import
java
.
util
.
Calendar
;
import
java
.
util
.
Date
;
public
class
TimeDemo
{
public
static
void
main
(
String
[
]
args
)
{
// 旧API
System
.
out
.
println
(
System
.
currentTimeMillis
(
)
)
;
// 1594801771810
Date date
=
new
Date
(
)
;
System
.
out
.
println
(
date
.
getTime
(
)
)
;
// 1594802296250
Calendar calendar
=
Calendar
.
getInstance
(
)
;
System
.
out
.
println
(
calendar
.
getTimeInMillis
(
)
)
;
// 1594802296258
// 新API
Instant instant
=
Instant
.
now
(
)
;
System
.
out
.
println
(
instant
.
getEpochSecond
(
)
)
;
// 1594802296
System
.
out
.
println
(
instant
.
toEpochMilli
(
)
)
;
// 1594802296321
LocalDateTime localDateTime
=
LocalDateTime
.
now
(
)
;
System
.
out
.
println
(
localDateTime
.
toEpochSecond
(
ZoneOffset
.
of
(
"+8"
)
)
)
;
// 1594802868
ZonedDateTime zonedDateTime
=
ZonedDateTime
.
now
(
)
;
System
.
out
.
println
(
zonedDateTime
.
toEpochSecond
(
)
)
;
// 1594803196
// 格式化 替换 SimpleDateFormat
DateTimeFormatter formatter
=
DateTimeFormatter
.
ofPattern
(
"yyyy-MM-dd HH:mm:ss"
)
;
System
.
out
.
println
(
formatter
.
format
(
localDateTime
)
)
;
// 2020-07-15 16:44:26
System
.
out
.
println
(
LocalDateTime
.
parse
(
"2020-07-15 16:43:47"
,
formatter
)
)
;
// 2020-07-15T16:43:47
处理redis连接数超高 redis连接数过大
程序日志出现 ERR max number of clients reached 报错,发现redis连接数被占满。解决思路:1、进入redis服务,连接上去cd /data/tools/redis/bin && ./redis-cli -h 10.66.89.123
10.66.89.123:6379> info clients
ERR max number of clie
python求一组数最小值运行 python求最小的100个素数
求100以内的素数素数的定义:1、素数又叫质数。2、素数指的是在正整数范围内,大于1并且只能被1和自身整除的数。3、最小的素数是2,大于2的素数都是奇数,2是素数中唯一的偶数。4、大于1的正整数中,不是素数就是合数代码:for i in range(2,100):
j = 2
flag = 1
for j in range(2,i):
if (i % j =