go的协程并发-channel消息机制

方式一

package main

import (
    "fmt"
    "time"
)

func main() {
    chs := make([]chan string, 10)

    for i := 0; i < 10 ; i++ {
        chs[i] = make(chan string)
        go count(chs[i], "foo", int64(i))
    }

    for i, _ := range(chs) {
        k := <-chs[i]
        fmt.Println(k)
    }
    fmt.Println("This is the end")
}

func count(ch chan string, str string, i int64) {
    str = str + fmt.Sprintf("%d", i)
    time.Sleep(time.Duration(i) * time.Second)
    ch <- str
}

方式二

package main

import (
    "fmt"
    "net/http"
    "io/ioutil"
    "time"
)

func main() {
    urls := []string{"http://httpbin.org/cookies", "http://httpbin.org/get","http://httpbin.org/post"}
    now := time.Now()

    ch := make(chan string)
    for i, _ := range urls {
        go getCon(ch, urls[i])
    }

    for _ = range urls{
        r := <-ch
        fmt.Println("------midware--------")
        fmt.Println(r)
    }
    fmt.Println(time.Since(now))
}

func getCon(ch chan string, url string) {
    resp, err := http.Get(url)
    if err != nil {
        ch <- err.Error()
    }

    defer resp.Body.Close()
    body, _ := ioutil.ReadAll(resp.Body)
    ch <- string(body[:])
    return
}

go-协程实现方案汇总