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41 lines
791 B
41 lines
791 B
package main
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import(
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"os"
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"time"
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)
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func main() {
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start := time.Now()
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ch := make(chan string)
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for _, url := range os.Args[1:]{
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go fetch(url, ch) // 启动一个goroutine
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}
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for range os.Args[1:]{
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fmt.Println(<- ch)
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}
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fmt.Printf("IMY*****main* %2fs elapsed\n", time.Since(start).Seconds())
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}
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func fetch(url string, ch chan <- string){
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start := time.Now()
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resp, err := http.Get(url)
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if err != nil{
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ch <- fmt.Sprint(err) // 发送到通道ch
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return
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}
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nbytes, err := io.Copy(ioutil.Discard, resp.Body)
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resp.Body.Close() //不要泄露资源
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if err != nil{
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ch <- fmt.Sprintf("while reading %s %v", url, err)
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return
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}
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secs := time.Since(start).Seconds()
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ch <- fmt.Sprintf("IMY***fetch* %.2fs, %7d %s ", secs, nbytes, url)
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}
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