我目前正在为“A”生成一个8字符伪随机大写字符串。。“Z”：
value = ""; 8.times{value << (65 + rand(25)).chr}
但它看起来不干净，而且不能作为参数传递，因为它不是一个单独的语句。要获取混合大小写字符串“a”。。“z”加“A”。。“Z”，我将其更改为：
value = ""; 8.times{value << ((rand(2)==1?65:97) + rand(25)).chr}
但它看起来像垃圾。
有人有更好的方法吗？
当前回答
下面是一个长度为8的随机密码的简单代码：
rand_password=('0'..'z').to_a.shuffle.first(8).join
其他回答
红宝石1.9+：
ALPHABET = ('a'..'z').to_a
#=> ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
10.times.map { ALPHABET.sample }.join
#=> "stkbssowre"
# or
10.times.inject('') { |s| s + ALPHABET.sample }
#=> "fdgvacnxhc"
SecureRandom.base64(15).tr('+/=lIO0', 'pqrsxyz')
来自Devise的东西
以下内容对我很有用
def generate_random_password(min_length, max_length)
length = SecureRandom.random_number(max_length - min_length) + min_length
character_sets = [
('a'..'z').to_a,
('A'..'Z').to_a,
('0'..'9').to_a,
"~!@^&*()_-+=[]|:;<,>.?".split('')
]
retval = []
#
# Add one character from each set
#
character_sets.each do |character_set|
character = character_set[SecureRandom.random_number(character_set.count)]
retval.push character
end
#
# Fill the rest of the password with a random character from a random set
#
i = character_sets.count - 1
while i < length
character_set = character_sets[SecureRandom.random_number(character_sets.count)]
character = character_set[SecureRandom.random_number(character_set.count)]
retval.push character
i += 1
end
retval.shuffle.join
end
请注意：rand对于攻击者来说是可预测的，因此可能不安全。如果这是用于生成密码的，则绝对应该使用SecureRandom。我用的是这样的东西：
length = 10
characters = ('A'..'Z').to_a + ('a'..'z').to_a + ('0'..'9').to_a
password = SecureRandom.random_bytes(length).each_char.map do |char|
characters[(char.ord % characters.length)]
end.join
以下是@Travis R答案的改进：
def random_string(length=5)
chars = 'abdefghjkmnpqrstuvwxyzABDEFGHJKLMNPQRSTUVWXYZ'
numbers = '0123456789'
random_s = ''
(length/2).times { random_s << numbers[rand(numbers.size)] }
(length - random_s.length).times { random_s << chars[rand(chars.size)] }
random_s.split('').shuffle.join
end
在@Travis R中，答案字符和数字在一起，所以有时random_string只能返回数字或字符。通过这种改进，random_string中至少有一半是字符，其余的是数字。以防万一，如果您需要一个包含数字和字符的随机字符串
