File Upload

How to upload a single file with parameters?

Server

server.go

  1. package main
  3. import (
  4.     "fmt"
  5.     "io"
  6.     "net/http"
  7.     "os"
  9.     "github.com/labstack/echo"
  10.     "github.com/labstack/echo/middleware"
  11. )
  13. func upload(c echo.Context) error {
  14.     // Read form fields
  15.     name := c.FormValue("name")
  16.     email := c.FormValue("email")
  18.     //-----------
  19.     // Read file
  20.     //-----------
  22.     // Source
  23.     file, err := c.FormFile("file")
  24.     if err != nil {
  25.         return err
  26.     }
  27.     src, err := file.Open()
  28.     if err != nil {
  29.         return err
  30.     }
  31.     defer src.Close()
  33.     // Destination
  34.     dst, err := os.Create(file.Filename)
  35.     if err != nil {
  36.         return err
  37.     }
  38.     defer dst.Close()
  40.     // Copy
  41.     if _, err = io.Copy(dst, src); err != nil {
  42.         return err
  43.     }
  45.     return c.HTML(http.StatusOK, fmt.Sprintf("<p>File %s uploaded successfully with fields name=%s and email=%s.</p>", file.Filename, name, email))
  46. }
  48. func main() {
  49.     e := echo.New()
  51.     e.Use(middleware.Logger())
  52.     e.Use(middleware.Recover())
  54.     e.Static("/", "public")
  55.     e.POST("/upload", upload)
  57.     e.Logger.Fatal(e.Start(":1323"))
  58. }

Client

index.html

  1. <!doctype html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="utf-8">
  5.     <title>Single file upload</title>
  6. </head>
  7. <body>
  8. <h1>Upload single file with fields</h1>
  10. <form action="/upload" method="post" enctype="multipart/form-data">
  11.     Name: <input type="text" name="name"><br>
  12.     Email: <input type="email" name="email"><br>
  13.     Files: <input type="file" name="file"><br><br>
  14.     <input type="submit" value="Submit">
  15. </form>
  16. </body>
  17. </html>

How to upload multiple files with parameters?

Server

server.go

  1. package main
  3. import (
  4.     "fmt"
  5.     "io"
  6.     "net/http"
  7.     "os"
  9.     "github.com/labstack/echo"
  10.     "github.com/labstack/echo/middleware"
  11. )
  13. func upload(c echo.Context) error {
  14.     // Read form fields
  15.     name := c.FormValue("name")
  16.     email := c.FormValue("email")
  18.     //------------
  19.     // Read files
  20.     //------------
  22.     // Multipart form
  23.     form, err := c.MultipartForm()
  24.     if err != nil {
  25.         return err
  26.     }
  27.     files := form.File["files"]
  29.     for _, file := range files {
  30.         // Source
  31.         src, err := file.Open()
  32.         if err != nil {
  33.             return err
  34.         }
  35.         defer src.Close()
  37.         // Destination
  38.         dst, err := os.Create(file.Filename)
  39.         if err != nil {
  40.             return err
  41.         }
  42.         defer dst.Close()
  44.         // Copy
  45.         if _, err = io.Copy(dst, src); err != nil {
  46.             return err
  47.         }
  49.     }
  51.     return c.HTML(http.StatusOK, fmt.Sprintf("<p>Uploaded successfully %d files with fields name=%s and email=%s.</p>", len(files), name, email))
  52. }
  54. func main() {
  55.     e := echo.New()
  57.     e.Use(middleware.Logger())
  58.     e.Use(middleware.Recover())
  60.     e.Static("/", "public")
  61.     e.POST("/upload", upload)
  63.     e.Logger.Fatal(e.Start(":1323"))
  64. }

Client

index.html

  1. <!doctype html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="utf-8">
  5.     <title>Multiple file upload</title>
  6. </head>
  7. <body>
  8. <h1>Upload multiple files with fields</h1>
  10. <form action="/upload" method="post" enctype="multipart/form-data">
  11.     Name: <input type="text" name="name"><br>
  12.     Email: <input type="email" name="email"><br>
  13.     Files: <input type="file" name="files" multiple><br><br>
  14.     <input type="submit" value="Submit">
  15. </form>
  16. </body>
  17. </html>

Source Code

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