gin/examples/upload-file/multiple/main.go

package main

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

	"github.com/gin-gonic/gin"
)

func main() {
	router := gin.Default()
	router.Static("/", "./public")
	router.POST("/upload", func(c *gin.Context) {
		name := c.PostForm("name")
		email := c.PostForm("email")

		// Multipart form
		form, err := c.MultipartForm()
		if err != nil {
			c.String(http.StatusBadRequest, fmt.Sprintf("get form err: %s", err.Error()))
			return
		}
		files := form.File["files"]

		for _, file := range files {
			// Source
			src, err := file.Open()
			if err != nil {
				c.String(http.StatusBadRequest, fmt.Sprintf("file open err: %s", err.Error()))
				return
			}
			defer src.Close()

			// Destination
			dst, err := os.Create(file.Filename)
			if err != nil {
				c.String(http.StatusBadRequest, fmt.Sprintf("Create file err: %s", err.Error()))
				return
			}
			defer dst.Close()

			// Copy
			io.Copy(dst, src)
		}

		c.String(http.StatusOK, fmt.Sprintf("Uploaded successfully %d files with fields name=%s and email=%s.", len(files), name, email))
	})
	router.Run(":8080")
}