Support upload single or multiple files.

[appleboy]

Fixed #774

upload single file:

package main

import (
	"github.com/gin-gonic/gin"
	"log"
	"net/http"
)

func main() {
	router := gin.Default()
	router.POST("/upload", func(c *gin.Context) {
		// single file
		file, _ := c.FormFile("file")
		log.Println(file.Filename)

		c.String(http.StatusOK, "Uploaded...")
	})
	router.Run(":8080")
}

curl command:

curl -X POST http://localhost:8080/upload -F "file=@/Users/mtk10671/z.sh" -H "Content-Type: multipart/form-data"

upload multiple file:

package main

import (
	"github.com/gin-gonic/gin"
	"log"
	"net/http"
)

func main() {
	router := gin.Default()
	router.POST("/upload", func(c *gin.Context) {
		// Multipart form
		form, _ := c.MultipartForm()
		files := form.File["upload[]"]

		for _, file := range files {
			log.Println(file.Filename)
		}
		c.String(http.StatusOK, "Uploaded...")
	})
	router.Run(":8080")
}

curl command:

curl -X POST http://localhost:8080/upload -F "upload[]=@/Users/mtk10671/z.sh" -F "upload[]=@/Users/mtk10671/z.sh" -H "Content-Type: multipart/form-data"

cc @selvam347 @tboerger @javierprovecho @andreynering

Signed-off-by: Bo-Yi Wu appleboy.tw@gmail.com

[codecov-io]

Current coverage is 93.25% (diff: 100%)

Merging #775 into develop will increase coverage by 0.18%

@@            develop       #775   diff @@
==========================================
  Files            16         16          
  Lines          1299       1305     +6   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits           1209       1217     +8   
+ Misses           77         76     -1   
+ Partials         13         12     -1   

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