golang 指定长度 随机数 & 随机字符串

Golang 指定长度随机数

//指定位数随机数
//使用包 crypto/rand
func CreateRandomNumber(len int)  string{
	var numbers = []byte{1,2,3,4,5,7,8,9}
	var container string
	length := bytes.NewReader(numbers).Len()

	for i:=1;i<=len;i++{
		random,err := rand.Int(rand.Reader,big.NewInt(int64(length)))
		if err != nil {

		}
		container += fmt.Sprintf("%d",numbers[random.Int64()])
	}
	return container
}

　

随机字符串

import (
	"math/big"
	"bytes"
	"crypto/rand"
	"github.com/go-ffmt/ffmt"
)

func main() {
	randomStr := CreateRandomString(15)
	ffmt.P(randomStr)
	//string("mCvYEd8MH8xnBRn")
}


func CreateRandomString(len int) string  {
	var container string
	var str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
	b := bytes.NewBufferString(str)
	length := b.Len()
	bigInt := big.NewInt(int64(length))
	for i := 0;i < len ;i++  {
		randomInt,_ := rand.Int(rand.Reader,bigInt)
		container += string(str[randomInt.Int64()])
	}
	return container
}