Go实现生产随机密码的示例代码

package main
import (
    "fmt"
    "math/rand"
    "os"
    "strconv"
    "time"
)
func RandomPassword(num int)   {
    length := num
    if len(os.Args) > 1 {
        arg := os.Args[1]
        i, err := strconv.ParseInt(arg, 10, 64)
        if err != nil {
            fmt.Println("参数转换失败")
            return
        }
        if i < 4 || i > 30 {
            fmt.Println("密码长度介于4~30之间")
            return
        }
        length = int(i)
    }
    baseStr := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    baseSymbol := "!@#$%^&*+-_=."
    fmt.Println("-----简单密码-----")
    for i := 0; i < 5; i++ {
        fmt.Println(getRandStr(baseStr, length))
    }
    fmt.Println("-----复杂密码-----")
    for i := 0; i < 5; i++ {
        fmt.Println(getRandStr(baseStr+baseSymbol, length))
    }
}
func getRandStr(baseStr string, length int) string {
    r := rand.New(rand.NewSource(time.Now().UnixNano() + rand.Int63()))
    bytes := make([]byte, length)
    l := len(baseStr)
    for i := 0; i < length; i++ {
        bytes[i] = baseStr[r.Intn(l)]
    }
    return string(bytes)
}
func main() {
    RandomPassword(25)
}

package main
import (
  "os"
  "fmt"
  "strconv"
  "math/rand"
  "time"
)
func Usage() {
  fmt.Println("USAGE: getpw [int]")
}
func main () {
  args := os.Args
  if (len(args) > 2) {
    Usage()
    return
  }
  if len(args) == 1 {
    makepw(8)
  }
  if len(args) == 2 {
    pwl , err := strconv.Atoi(args[1])
    if err != nil {
      fmt.Println("参数不是数字")
      return
    }
    makepw(pwl)
  }
}
func makepw(pwl int) {
  chars := "abcdefghijkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789"
  clen := float64(len(chars))
  res := ""
  rand.Seed(time.Now().Unix())
  for i := 0; i < pwl; i++ {
    rfi := int(clen * rand.Float64())
    res += fmt.Sprintf("%c", chars[rfi])
  }
  fmt.Println(res)
}

// fileName      :  genpassword.go
// createdAt     :  2021-12-07
// description   :  利用flag生成随机密码
package main
import (
	"flag"
	"fmt"
	"math/rand"
	"time"
)
var (
	Length int
	Type   int
	Num    = "0123456789"
	Char   = "abcdefghijklkmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ"
	Tchar  = "!@#$%^&*()-."
)
func initFlag() {
	flag.IntVar(&Length, "l", 16, "-l 密码长度 默认16位")
	flag.IntVar(&Type, "t", 1,
		`-t类型 
			1纯字母 
			2纯英文字母
			3字母+数字 
			4字母+数字+特殊符号`)
	flag.Parse()
}
func generagePassword() string {
	source := Num
	if Type == 2 {
		source = Char
	} else if Type == 3 {
		source = Num + Char
	} else if Type == 4 {
		source = Num + Char + Tchar
	}
	pwd := make([]byte, Length, Length)
	for i := 0; i < Length; i++ {
		index := rand.Intn(len(source))
		//pwd = append(pwd, source[index])
		pwd[i] = source[index]
	}
	return string(pwd)
}
func main() {
	rand.Seed(time.Now().UnixNano())
	initFlag()
	password := generagePassword()
	fmt.Println(password)
}
// 执行 go run genpassword.go -l=16 -t=4
//输出 .q$AetKww&fJbVs(