Question

package main

import (
	"fmt"
	"os"
)

/*解析命令行参数*/
func main() {
	fmt.Println("命令行参数有：", len(os.Args))
	for i, v := range os.Args {
		fmt.Printf("args[%v]=%v\n", i, v)
	}
}
package main

import (
	"flag"
	"fmt"
)

/*解析命令行参数*/
func main() {
	var user string
	var pwd string
	var host string
	var port int
	flag.StringVar(&user, "u", "", "用户名，默认为空")
	flag.StringVar(&pwd, "pwd", "", "密码，默认为空")
	flag.StringVar(&host, "h", "localhost", "主机名，默认为空")
	flag.IntVar(&port, "port", 3306, "端口号，默认为空")
	/*转换*/
	flag.Parse()
	fmt.Printf("user=%v pwd=%v host=%v port=%v", user, pwd, host, port)
}