FTP: Difference between revisions

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 Connect to a server, change directory, list its contents and download a file as binary using the FTP protocol. Use passive mode if available.
+=={{header|Go}}==
+Using the FTP package from [https://godoc.org/github.com/stacktic/ftp github.com/stacktic/ftp].
+<lang go>package main
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"github.com/stacktic/ftp"
+)
+func main() {
+	// Hard-coded demonstration values
+	const (
+		hostport = "localhost:21"
+		username = "anonymous"
+		password = "anonymous"
+		dir      = "pub"
+		file     = "somefile.bin"
+	)
+	conn, err := ftp.Connect(hostport)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer conn.Quit()
+	fmt.Println(conn)
+	if err = conn.Login(username, password); err != nil {
+		log.Fatal(err)
+	}
+	if err = conn.ChangeDir(dir); err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(conn.CurrentDir())
+	files, err := conn.List(".")
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, f := range files {
+		fmt.Printf("%v %12d %v %v\n", f.Time, f.Size, f.Type, f.Name)
+	}
+	r, err := conn.Retr(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer r.Close()
+	f, err := os.Create(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+	n, err := io.Copy(f, r)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("Wrote", n, "bytes to", file)
+}</lang>
 =={{header|Java}}==