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| package main
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"net/http"
"strconv"
)
func main() {
ret, err := download("http://....")
if err != nil {
fmt.Println(err)
}
fmt.Println(ret)
}
func download(url string) (string, error) {
var (
err error
resp *http.Response
contentLen int64
downloadLen int
)
if resp, err = http.Get(url); err != nil {
return "", err
}
if contentLen, err = strconv.ParseInt(resp.Header.Get("Content-Length"), 10, 64); err != nil {
return "", err
}
defer func() {
_ = resp.Body.Close()
fmt.Print("\n")
}()
h := md5.New()
for {
buf := make([]byte, 1024)
c, e := resp.Body.Read(buf)
if e != nil && e != io.EOF {
return "", e
}
downloadLen += c
printProgress(downloadLen, contentLen)
h.Write(buf[0:c])
if e != nil && e == io.EOF {
break
}
}
return hex.EncodeToString(h.Sum(nil)), nil
}
func printProgress(downloadLen int, contentLen int64) {
fmt.Printf("\r")
fmt.Printf("Downloading... %d of %d", downloadLen, contentLen)
}
|