Golang cron 定时器和定时任务的使用场景

package main

import (
    "fmt"
    "time"
)

func main() {

    //设置定时器为3秒
    timer := time.NewTimer(3 * time.Second)
    fmt.Println("当前时间为:", time.Now())

    t := <-timer.C //从定时器拿数据
    fmt.Println("当前时间为:", t)
}

package main

import (
    "fmt"
    "time"
)

func main() {

    //创建一个周期性的定时器
    ticker := time.NewTicker(3 * time.Second)
    fmt.Println("当前时间为:", time.Now())

    go func() {
        for {

            //从定时器中获取数据
            t := <-ticker.C
            fmt.Println("当前时间为:", t)

        }
    }()

    for {
        time.Sleep(time.Second * 1)
    }
}

package main

import (
	"github.com/robfig/cron"
	"log"
	"time"
)

func main() {
	//cron1()

	//cron2()

	cron3()

	select {
	}
}

func cron1()  {
	log.Println("Starting...")
	c := cron.New()
	c.AddFunc("* * * * * *", func() {
		log.Println("Run models.CleanAllTag...")
	})
	c.AddFunc("* * * * * *", func() {
		log.Println("Run models.CleanAllArticle...")
	})

	c.Start()

	t1 := time.NewTimer(time.Second * 10)
	for {
	select {
	case <-t1.C:
	    t1.Reset(time.Second * 10)
	}
	}
}

func cron2()  {
	log.Println("Starting...")
	c := cron.New()  // 新建一个定时任务对象
	c.AddFunc("* * * * * *", func() {
		log.Println("hello world")
	})  // 给对象增加定时任务
	c.Start()
	//select {
	//}
	time.Sleep(10 * time.Second)
	c.Stop()
}

func cron3()  {
	log.Println("Starting...")

	c := cron.New()
	h := Hello{"I Love You!"}
	// 添加定时任务
	c.AddJob("*/2 * * * * *", h)
	// 添加定时任务 5秒执行一次
	c.AddFunc("*/5 * * * * *", func() {
		log.Println("hello word")
	})

	s, err := cron.Parse("*/3 * * * * *")
	if err != nil {
		log.Println("Parse error")
	}
	h2 := Hello{"I Hate You!"}
	c.Schedule(s, h2)
	// 其中任务
	c.Start()
	// 关闭任务
	defer c.Stop()
}

type Hello struct {
	Str string
}

func(h Hello) Run() {
	log.Println(h.Str)
}