Golang定时任务实现方法详解

package main
import (
"fmt"
"time"
)
func main() {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
    select {
    case <-ticker.C:
        fmt.Println("执行定时任务：", time.Now())
    }
}
}

package main
import (
"fmt"
"time"
)
func main() {
timer := time.AfterFunc(3*time.Second, func() {
fmt.Println("延迟任务执行：", time.Now())
})
// 阻塞主线程，确保程序不会提前退出
time.Sleep(5 * time.Second)
timer.Stop() // 如果需要可以取消
}

go get github.com/robfig/cron/v3

package main
import (
"fmt"
"time"
"github.com/robfig/cron/v3"
)
func main() {
c := cron.New()
// 添加任务：每天 8:00 执行
c.AddFunc("0 8 * * *", func() {
    fmt.Println("每日任务执行：", time.Now())
})

c.Start()
defer c.Stop()

// 保持程序运行
select {}
}

package main
import (
"fmt"
"sync"
"time"
"github.com/robfig/cron/v3"
)
func main() {
var mu sync.Mutex
isRunning := false
c := cron.New()
c.AddFunc("@every 10s", func() {
    mu.Lock()
    if isRunning {
        fmt.Println("任务正在执行，跳过本次调度")
        mu.Unlock()
        return
    }
    isRunning = true
    mu.Unlock()

    // 模拟耗时任务
    fmt.Println("任务开始：", time.Now())
    time.Sleep(15 * time.Second)
    fmt.Println("任务结束：", time.Now())

    mu.Lock()
    isRunning = false
    mu.Unlock()
})

c.Start()
defer c.Stop()

select {}
}