Golang中的命令行参数

import (
	"fmt"
	"os"
)

func main() {
	fmt.Println(len(os.Args))
	for i := range os.Args {
		fmt.Println("i=", i, " args=", os.Args[i])
	}
}

运行以上代码，带上参数

 $ go run main.go xx1 xx2 xx3
4
i= 0  args= /var/folders/ph/8lpk54xn1vj6fc3fr23gc4nc0000gn/T/go-build3333773637/b001/exe/main
i= 1  args= xx1
i= 2  args= xx2
i= 3  args= xx3

和Java中带参数的方式类似。

试用flag包来解析命令行参数

import (
	"flag"
	"fmt"
)

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

	flag.StringVar(&user, "u", "", "用户名")
	flag.StringVar(&password, "p", "", "密码")
	flag.StringVar(&host, "h", "127.0.0.1", "主机名")
	flag.IntVar(&port, "port", 3306, "端口号")

	flag.Parse()

	fmt.Println("user:", user)
	fmt.Println("password:", password)
	fmt.Println("host:", host)
	fmt.Println("port:", port)
}

 $ go run main1.go -u root -p123456 -h 192.168.0.2 -port 13306
flag provided but not defined: -p123456
Usage of /var/folders/ph/8lpk54xn1vj6fc3fr23gc4nc0000gn/T/go-build54840619/b001/exe/main1:
  -h string
        主机名 (default "127.0.0.1")
  -p string
        密码
  -port int
        端口号 (default 3306)
  -u string
        用户名
exit status 2

 $ go run main1.go -u root -p 123456 -h 192.168.0.2 -port 13306
user: root
password: 123456
host: 192.168.0.2
port: 13306