Go获取命令行参数

package main

import 
(
	"flag"
	"fmt"
)

func main(){
	var user string
	var password string
	var hostname string
	var port int

	flag.StringVar(&user, "u","","用户名称")
	flag.StringVar(&password, "p","","用户名称")
	flag.StringVar(&hostname, "h","","用户名称")
	flag.IntVar(&port, "P",3306,"用户名称")

	flag.Parse()

	fmt.Println(port)
}