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Question

Am trying to upload files to a directory using go code below. source

The Issue am having is that when I run the code, it prints files successfully uploaded but when I get to the directory, No file is uploaded there. Any solution will be appreciated. Thanks

package main

 import (
    "fmt"
    "io"
    "net/http"
    "os"
 )

 func uploadHandler(w http.ResponseWriter, r *http.Request) {

    // the FormFile function takes in the POST input id file
    file, header, err := r.FormFile("file")

    if err != nil {
        fmt.Fprintln(w, err)
        return
    }

    defer file.Close()

    out, err := os.Create("/upload")
    if err != nil {
        fmt.Fprintf(w, "Unable to create the file for writing. Check your write access privilege")
        return
    }

    defer out.Close()

    // write the content from POST to the file
    _, err = io.Copy(out, file)
    if err != nil {
        fmt.Fprintln(w, err)
    }

    fmt.Fprintf(w, "File uploaded successfully : ")
    fmt.Fprintf(w, header.Filename)
 }

 func main() {
    http.HandleFunc("/", uploadHandler)
    http.ListenAndServe(":8080", nil)
 }

Answer 1

Below is how I get my files uploaded to server. Source

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func uploadFile(w http.ResponseWriter, r *http.Request) {
    fmt.Println("File Upload Endpoint Hit")

    // Parse our multipart form, 10 << 20 specifies a maximum
    // upload of 10 MB files.
    r.ParseMultipartForm(10 << 20)
    // FormFile returns the first file for the given key `myFile`
    // it also returns the FileHeader so we can get the Filename,
    // the Header and the size of the file
    file, handler, err := r.FormFile("myFile")
    if err != nil {
        fmt.Println("Error Retrieving the File")
        fmt.Println(err)
        return
    }
    defer file.Close()
    fmt.Printf("Uploaded File: %+v
", handler.Filename)
    fmt.Printf("File Size: %+v
", handler.Size)
    fmt.Printf("MIME Header: %+v
", handler.Header)

    // Create a temporary file within our temp-images directory that follows
    // a particular naming pattern
    tempFile, err := ioutil.TempFile("temp-images", "upload-*.png")
    if err != nil {
        fmt.Println(err)
    }
    defer tempFile.Close()

    // read all of the contents of our uploaded file into a
    // byte array
    fileBytes, err := ioutil.ReadAll(file)
    if err != nil {
        fmt.Println(err)
    }
    // write this byte array to our temporary file
    tempFile.Write(fileBytes)
    // return that we have successfully uploaded our file!
    fmt.Fprintf(w, "Successfully Uploaded File
")
}

func setupRoutes() {
    http.HandleFunc("/upload", uploadFile)
    http.ListenAndServe(":8080", nil)
}

func main() {
    fmt.Println("Hello World")
    setupRoutes()
}