HTTP服务器和客户端下载多个文件

Question

I have tried setting up a download server and a download client for individual files. How can I modify them to serve/download all the files from a directory?

Following are my server and client codes:

//server.go
func main() {
        http.HandleFunc("/dlpath", handle)
        err := http.ListenAndServe(":10001", nil)
        if err != nil {
            log.Fatal("ListenAndServe: ", err)
        }
    }

func handle(writer http.ResponseWriter, r *http.Request) {
    filename := "C:\\Users\\aarvi\\GolandProjects\\src\\Practice\\download\\serve\\send.txt"
    http.ServeFile(writer, r, filename)
}

//client.go
func main() {
    downloadFile("res_out.txt", "http://localhost:10001/dlpath")
}

func downloadFile(dirname string, url string) error {

    // Create the file
    out, err := os.OpenFile(dirname, os.O_WRONLY | os.O_CREATE | os.O_APPEND, 0666)
    if err != nil {
        fmt.Println(err)
    }
    defer out.Close()

    // get data
    request, err := http.NewRequest("GET", url, nil)
    if err != nil {
        fmt.Println(err)
    }

    client := http.Client{}
    resp, err := client.Do(request)
    if err != nil {
        return err
    }
    defer resp.Body.Close()

    // Write the body to file
    _, err = io.Copy(out, resp.Body)
    if err != nil {
        return err
    }
    return nil
}

I tried serving the directory in the handle function like so:

dirname := "C:\\Users\\aarvi\\GolandProjects\\src\\Practice\\download\\serve"
http.FileServer(http.Dir(dirname))

and tried to print out the response on the client side, but I got nothing. How can I serve all the files from the /serve directory, and download them in the client?

EDIT: Following are the contents of the serve directory:

serve ---sample.txt ---send.txt ---dir2 ------abc.txt

How can I download all these files on the client side as separate files, with the directory structure intact?

Update: When I call the http.Handle function (as mentioned in the answer) directly in the main function, I am able to serve all the files, and the file within the inner directory too.

However, when I call the same within the handle function, it doesn't serve anything. I am guessing this has something to do with the path?

Answer 1

The problem can be in the file path you are requesting. It is prefixed with /dlpath/. You must strip this prefix and pass the rest of the text as a path. See: https://godoc.org/net/http#FileServer

Could you try this code snippet:

package main

import (
    "log"
    "net/http"
)

func main() {
        dirName := "C:\\Users\\aarvi\\GolandProjects\\src\\Practice\\download\\serve"

        http.Handle("/dlpath/", http.StripPrefix("/dlpath", http.FileServer(http.Dir(dirName))))

        err := http.ListenAndServe(":8001", nil)
        if err != nil {
                log.Fatal("ListenAndServe: ", err)
        }
}

Hope this helps.

P.S. This is from the case when you are serving the directory in the handler function.