随机字符串生成器

package main

import (
    "crypto/rand"
    "fmt"
    "math/big"
)

func main() {
    count := 10
    length := 12
    charset := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

    for i := 0; i < count; i++ {
        fmt.Println(generateRandomString(length, charset))
    }
}

func generateRandomString(length int, charset string) string {
    b := make([]byte, length)
    for i := range b {
        n, _ := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
        b[i] = charset[n.int64()]
    }
    return string(b)
}