1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | package main import ( "fmt" "time" "strconv" "net/http" "io/ioutil" ) var ( maxRoutineNum = 5 ) func main() { ch := make(chan int, maxRoutineNum) for i := 1; i < 2000000; i++ { ch <- 1 go func(i int) { run(i) defer func() { <-ch }() }(i) fmt.Println("+") } //确保执行完后主线程再退出 for i := 0; i < 10; i++ { ch <- 1 } } func run(s int){ str := strconv.Itoa(s) fmt.Println("*"+str+"*") HttpGet("https://xg623.oss-cn-hongkong.aliyuncs.com/623.apk",str) //time.Sleep(1*time.Second) time.Sleep(1*time.Microsecond) } func HttpGet(url string,s string) (string,error){ resp, err := http.Get(url+"?rnd="+s) if err != nil { fmt.Println(err) return "",err } defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if err != nil { fmt.Println(err) return "",err } err = ioutil.WriteFile("E:\\GoPro\\src\\test\\down\"+s, body, 0777) if err != nil { fmt.Println(err) return "",err } return string(body),nil } |