Gin 8

[root@h160 ~]# hostnamectl 
   Static hostname: h160
         Icon name: computer-vm
           Chassis: vm
        Machine ID: d46f9440d4be429ea66b726977adf233
           Boot ID: a0fc6a1b4f124e39a27866d4df0701fa
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-862.2.3.el7.x86_64
      Architecture: x86-64
[root@h160 ~]# ip a 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:c9:c7:04 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global noprefixroute dynamic eth0
       valid_lft 84363sec preferred_lft 84363sec
    inet6 fe80::5054:ff:fec9:c704/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:48:f4:2c brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.160/24 brd 192.168.56.255 scope global noprefixroute eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe48:f42c/64 scope link 
       valid_lft forever preferred_lft forever
[root@h160 ~]# go version
go version go1.9.4 linux/amd64
[root@h160 ~]#

[vagrant@h160 ~]$ echo $GOPATH
/vagrant/go
[vagrant@h160 ~]$ cd $GOPATH
[vagrant@h160 go]$ pwd
/vagrant/go
[vagrant@h160 go]$ 

package main //指明此包为 main 包

import ( //使用这种方式导入多个包可以更为简洁
	"fmt"      //导入 fmt，可以进行格式化输出
	"log"      //使用 log 包来进行日志生成
	"net/http" // 导入 net/http 可以使用其中的 http.StatusOK

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

func main() {
	r := gin.Default()                       // 使用 gin.Default() 方法生成一个引擎实例,这个实例默认情况下已经将 Logger Recovery 进行了装载
	r.MaxMultipartMemory = 8 << 20           // 8 MiB
	r.POST("/upload", func(c *gin.Context) { //使用 POST 方法　func (group *RouterGroup) POST(relativePath string, handlers ...HandlerFunc) IRoutes　，POST 是　router.Handle("POST", path, handle) 的快捷方式
		file, _ := c.FormFile("file")                                         //func (c *Context) FormFile(name string) (*multipart.FileHeader, error) , FormFile returns the first file for the provided form key.
		log.Println(file.Filename)                                            //console 打印出文件名
		c.SaveUploadedFile(file, "/tmp/test")                                 // 将文件存到指定的位置 func (c *Context) SaveUploadedFile(file *multipart.FileHeader, dst string) error
		c.String(http.StatusOK, fmt.Sprintf("'%s' uploaded!", file.Filename)) //将文件名进行打印，也在客户端反馈成功的信息
	})
	r.Run(":8080") //在 0.0.0.0:8080 上启监听
}

[root@h160 go]# go run hello.go 
[GIN-debug] [WARNING] Now Gin requires Go 1.6 or later and Go 1.7 will be required soon.

[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:	export GIN_MODE=release
 - using code:	gin.SetMode(gin.ReleaseMode)

[GIN-debug] POST   /upload                   --> main.main.func1 (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080
test.txt
[GIN] 2018/07/09 - 15:29:08 | 200 |  202.794185ms |  192.168.56.105 | POST     /upload
...
...
...

[vagrant@h105 ~]$ echo abc > test.txt
[vagrant@h105 ~]$ cat test.txt 
abc
[vagrant@h105 ~]$
[vagrant@h105 ~]$ curl  -X POST http://192.168.56.160:8080/upload -F "file=@./test.txt" -H "Content-Type: multipart/form-data"
'test.txt' uploaded![vagrant@h105 ~]$ 
[vagrant@h105 ~]$ 

[vagrant@h160 ~]$ cat /tmp/test 
abc
[vagrant@h160 ~]$ ll /tmp/test 
-rw-r--r--. 1 root root 4 Jul  9 15:29 /tmp/test
[vagrant@h160 ~]$