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package main | |
import ( | |
"io" | |
"os" | |
"fmt" | |
"sync" | |
"strconv" | |
"strings" | |
"io/ioutil" | |
"regexp" | |
"net/http" | |
"path/filepath" | |
) | |
var URL string = "http://www.yanshuo.me/r/meizi/rank/" | |
func main () { | |
c := make(chan string, 5) | |
var wg sync.WaitGroup | |
wg.Add(1) | |
go parsePage(c, &wg) | |
rootpath := filepath.Join(".", "imgs") | |
os.MkdirAll(rootpath, os.ModePerm) | |
for i := 0; i < 3; i++ { | |
wg.Add(1) | |
go downloader(c, &wg, rootpath) | |
} | |
wg.Wait() | |
} | |
func parsePage(c chan string, wg *sync.WaitGroup) { | |
re, _ := regexp.Compile(`data-original=\"(.*)\"\s`) | |
page_no := 1 | |
for true { | |
url := URL + strconv.Itoa(page_no) | |
fmt.Println(url) | |
res, err := http.Get(url) | |
checkErr(err) | |
body, _ := ioutil.ReadAll(res.Body) | |
img_list := re.FindAllString(string(body), -1) | |
for _,i := range img_list { | |
url := i[15:] | |
url = "http:" + url[:len(url)-2 ] | |
c <- url | |
} | |
res.Body.Close() | |
if len(img_list) == 0 { | |
break | |
} | |
page_no += 1 | |
} | |
close(c) | |
wg.Done() | |
} | |
func downloader(c chan string, wg *sync.WaitGroup, rootpath string) { | |
for url := range c { | |
path := filepath.Join(rootpath, strings.Split(url, "/")[4]) | |
if _, err := os.Stat(path); !os.IsNotExist(err) { | |
continue | |
} | |
response, err := http.Get(url) | |
checkErr(err) | |
file, err := os.Create(path) | |
checkErr(err) | |
_, err = io.Copy(file, response.Body) | |
checkErr(err) | |
file.Close() | |
response.Body.Close() | |
fmt.Println(path+" Ok") | |
} | |
wg.Done() | |
} | |
func checkErr(err error) { | |
if err != nil { | |
panic(err) | |
} | |
} |
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