golang Gin upload file to return to front-end and middleware implementation example

Upload file

package main
import (
	"fmt"
	"/gin-gonic/gin"
)
func main() {
	router := ()
	// Limit the upload size for the form (default 32 MiB)	//  = 8 &lt;&lt; 20  // 8 MiB
	("/upload", func(c *) {
		// Single file		file, _ := ("file")
		// Upload the file to the specified path		(file, "./"+)

		//(, ("'%s' uploaded!", ))
		().Add("Content-Disposition",("attachment;filename=%s",))
		("./"+)
	})
	(":8080")
}

Return the file to the front end

().Add("Content-Disposition",("attachment;filename=%s",))
("./"+)  //Return the file path and call the method automatically

middleware

Two ways to call middleware

Method 1: Continuous call in Use

v1 := ("v1").Use(middel())
v1 := ("v1").Use(middel(),middel2())

Method 2: Use chain call

v1 := ("v1").Use(middel()).Use(middel2())

Single middleware

package main
import (
	"fmt"
	"/gin-gonic/gin"
)
func middel(){
	return func(context *) {
		("I'm in the first 1")
		()
		("I'm after the method")
	}
}
func main() {
	r := ()
	v1 := ("v1").Use(middel())
	("/test", func(c *) {
		("I'm inside the method")
		(200, {
			"msg": true,
		})
	})
	(":8080")
}

result

I'm in the first method 1
I'm inside the method
I'm after the method 1

Multiple middleware

package main
import (
	"fmt"
	"/gin-gonic/gin"
)
func middel(){
	return func(context *) {
		("I'm in the first 1")
		()
		("I'm after the method")
	}
}
func middel2(){
	return func(context *) {
		("I'm in the first 2")
		()
		("I'm after 2")
	}
}
func main() {
	r := ()
	v1 := ("v1").Use(middel(),middel2())
	("/test", func(c *) {
		("I'm inside the method")
		(200, {
			"msg": true,
		})
	})
	(":8080")
}
//Like an onion

result

I'm in the first method 1
I'm in the first 2
I'm inside the method
I'm after the method 2
I'm after the method 1

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