Golang FTP File Upload: A Comprehensive Guide with Code Example

Here's an example code for sending a file via FTP in Go:

package main

import (
    "fmt"
    "net/url"
    "os"
    "path/filepath"

    "github.com/jlaffaye/ftp"
)

func main() {
    // FTP connection details
    ftpURL := 'ftp://ftp.example.com'
    ftpUsername := 'username'
    ftpPassword := 'password'

    // Local file path
    localFilePath := '/path/to/local/file.txt'

    // Remote file name
    remoteFileName := 'remote_file.txt'

    // Connect to FTP server
    ftpURLParsed, err := url.Parse(ftpURL)
    if err != nil {
        fmt.Println("Error parsing FTP URL:", err)
        return
    }
    ftpConn, err := ftp.Dial(ftpURLParsed.Host)
    if err != nil {
        fmt.Println("Error connecting to FTP server:", err)
        return
    }
    defer ftpConn.Quit()

    // Login to FTP server
    err = ftpConn.Login(ftpUsername, ftpPassword)
    if err != nil {
        fmt.Println("Error logging in to FTP server:", err)
        return
    }

    // Open local file
    localFile, err := os.Open(localFilePath)
    if err != nil {
        fmt.Println("Error opening local file:", err)
        return
    }
    defer localFile.Close()

    // Change to FTP directory
    remoteDir := ftpURLParsed.Path
    if remoteDir == "" {
        remoteDir = "/"
    }
    err = ftpConn.ChangeDir(remoteDir)
    if err != nil {
        fmt.Println("Error changing to FTP directory:", err)
        return
    }

    // Upload file to FTP server
    err = ftpConn.Stor(remoteFileName, localFile)
    if err != nil {
        fmt.Println("Error uploading file to FTP server:", err)
        return
    }

    fmt.Println("File uploaded successfully")
}

Make sure to replace the FTP connection details, local file path, and remote file name with your own values.