golang|golang学习 ---并发获取多个URL

package mainimport ( "fmt" "io" "io/ioutil" "net/http" "os" "time" )func main() { start := time.Now() ch := make(chan string) for _, url := range os.Args[1:] { go fetch(url, ch) // start a goroutine } for range os.Args[1:] { fmt.Println(<-ch) // receive from channel ch } fmt.Printf("%.2fs elapsed\n", time.Since(start).Seconds()) }func fetch(url string, ch chan<- string) { start := time.Now() resp, err := http.Get(url) if err != nil { ch <- fmt.Sprint(err) // send to channel ch return } nbytes, err := io.Copy(ioutil.Discard, resp.Body) resp.Body.Close() // don't leak resources if err != nil { ch <- fmt.Sprintf("while reading %s: %v", url, err) return } secs := time.Since(start).Seconds() ch <- fmt.Sprintf("%.2fs%7d%s", secs, nbytes, url) }

【golang|golang学习 ---并发获取多个URL】

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