java - 随 secret 码生成

Question

我写了一个随 secret 码生成的代码。有一个字符串，我必须从中创建密码。所以我尝试根据大写数组、小写数组和数字数组对字符串进行分类。但是问题来了..

         for(int k=0;k<Length;k++){
        if(asc[k]>=65 && asc[k]<=90){
            UpperCase[k]=(char)asc[k];
        }
        else if(asc[k]>=48 && asc[k]<=57){
            Digit[k]=(char)asc[k];
        }
        else {
            Mixed[k]=(char)asc[k];
        }
    } 

被执行它计算了一些我不想要的空间。编码看起来像丑陋的 sry 因为我糟糕的编码。我知道有更多的方法来解决它但我想通过这个。这是我的代码。这是我的代码

import java.util.Random;

   public class Randompassgeneration
   {

final int MAX_LENGTH = 20;
final int MIN_LENGTH = 3;

char[] password=new char[25];
int [] asc=new int[18];
char[] UpperCase=new char[25];
char[] Digit=new char[25];
char[] Mixed=new char[25];
public void generate(String allowedCharacters)
{
    int Length=allowedCharacters.length();


    for (int i=0;i<Length;i++)
    {
        asc[i]=(int)allowedCharacters.charAt(i);

    }
    for (int k=0;k<Length;k++)
    {
        if (asc[k]>=65 && asc[k]<=90)
        {
            UpperCase[k]=(char)asc[k];
        }
        else if (asc[k]>=48 && asc[k]<=57)
        {
            Digit[k]=(char)asc[k];
        }
        else
        {
            Mixed[k]=(char)asc[k];
        }
    }

    String rp=null;
    StringBuilder Strbld=new StringBuilder();
    Random rnd=new Random();
    int ranStrLen=rnd.nextInt(MAX_LENGTH - MIN_LENGTH + 1) + MIN_LENGTH;
    Strbld.append(UpperCase[rnd.nextInt(UpperCase.length)]);
    Strbld.append(Digit[rnd.nextInt(Digit.length)]);

    for (int m=0; m<ranStrLen-2; m++)
    {
        Strbld.append(Mixed[rnd.nextInt(Mixed.length)]);

    }

    System.out.print(ranStrLen +"->"+ Strbld.toString());


}

public static void main(String[] args)
{
    String allowedCharacters = "weakPasSWorD1234$*";
    Randompassgeneration t=new Randompassgeneration();
    t.generate(allowedCharacters);
}
}

有什么建议吗？

Answer 1

我会生成最少数量的字符、数字和符号。随机填充其他字符并将结果洗牌。这样，它将以最少的努力满足您的最低要求。

public static String passwordGenerator() {
    List<Character> chars = new ArrayList<>();
    Random rand = new Random();
    // min number of digits
    for (int i = 0; i < 1; i++) chars.add((char) ('0' + rand.nextInt(10)));
    // min number of lower case
    for (int i = 0; i < 2; i++) chars.add((char) ('a' + rand.nextInt(26)));
    // min number of upper case
    for (int i = 0; i < 1; i++) chars.add((char) ('A' + rand.nextInt(26)));
    // min number of symbols
    String symbols = "!\"$%^&*()_+{}:@~<>?,./;'#][=-\\|'";
    for (int i = 0; i < 1; i++) chars.add(symbols.charAt(rand.nextInt(symbols.length())));
    // fill in the rest
    while (chars.size() < 8) chars.add((char) ('!' + rand.nextInt(93)));
    // appear in a random order
    Collections.shuffle(chars);
    // turn into a String
    char[] arr = new char[chars.size()];
    for (int i = 0; i < chars.size(); i++) arr[i] = chars.get(i);
    return new String(arr);
}

public static void main(String... args) {
    for (int i = 0; i < 100; i++)
        System.out.println(passwordGenerator());
}