Created
August 22, 2016 09:14
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Use goroutine to download multiple files
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| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "log" | |
| "net/http" | |
| "os" | |
| "strings" | |
| "sync" | |
| ) | |
| func main() { | |
| urls := []string{ | |
| "http://example.com/file1", | |
| "http://example.com/file2", | |
| "http://example.com/file3", | |
| } | |
| var wg sync.WaitGroup | |
| wg.Add(len(urls)) | |
| for _, url := range urls { | |
| go func(url string) { | |
| defer wg.Done() | |
| tokens := strings.Split(url, "/") | |
| fileName := tokens[len(tokens)-1] | |
| fmt.Println("Downloading", url, "to", fileName) | |
| output, err := os.Create(fileName) | |
| if err != nil { | |
| log.Fatal("Error while creating", fileName, "-", err) | |
| } | |
| defer output.Close() | |
| res, err := http.Get(url) | |
| if err != nil { | |
| log.Fatal("http get error: ", err) | |
| } else { | |
| defer res.Body.Close() | |
| _, err = io.Copy(output, res.Body) | |
| if err != nil { | |
| log.Fatal("Error while downloading", url, "-", err) | |
| } else { | |
| fmt.Println("Downloaded", fileName) | |
| } | |
| } | |
| }(url) | |
| } | |
| wg.Wait() | |
| fmt.Println("Done") | |
| } |
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