数字+字符的随机工具

数字+字符的随机工具

前端

function randomString(len) {
    const CHARACTERS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    const BASE = CHARACTERS.length;
    let result = '';

    while (result.length < len) {
        // 生成一个大随机数并转换为 62 进制字符串
        let randomNum = Math.floor(Math.random() * Number.MAX_SAFE_INTEGER);
        let randomPart = toBase62(randomNum, CHARACTERS, BASE);
        result += randomPart;
    }

    return result.slice(0, len);  // 截取指定长度
}

// 将数字转换为 62 进制字符串
function toBase62(value, characters, base) {
    let result = '';
    do {
        const index = value % base;
        result = characters[index] + result;
        value = Math.floor(value / base);
    } while (value > 0);

    return result;
}

// 示例：生成一个长度为 11 的随机字符串
console.log(randomString(11));

后端

import java.util.Random;

public class RandomStringGenerator {
    private static final String CHARACTERS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private static final int BASE = CHARACTERS.length();
    private static final Random RANDOM = new Random();

    public static String randomString(int len) {
        StringBuilder sb = new StringBuilder(len);

        while (sb.length() < len) {
            // 生成一个较大的随机数，再将其转换为 62 进制字符串
            long randomLong = Math.abs(RANDOM.nextLong());
            String randomPart = toBase62(randomLong);
            sb.append(randomPart);
        }

        return sb.substring(0, len);  // 截取指定长度
    }

    // 将数字转换为 62 进制字符串
    private static String toBase62(long value) {
        StringBuilder sb = new StringBuilder();
        
        do {
            int index = (int) (value % BASE);
            sb.append(CHARACTERS.charAt(index));
            value /= BASE;
        } while (value > 0);

        return sb.reverse().toString();
    }

    public static void main(String[] args) {
        System.out.println(randomString(11));  // 生成一个长度为 11 的随机字符串
    }
}

颜色随机工具

前端

function randomColor(len = 6) {
    if (len <= 11) {
        return Math.random().toString(36).substring(2, 2 + len);
    } else {
        return randomColor(11) + randomColor(len - 11);
    }
}

后端

import java.util.Random;

public class RandomColorGenerator {
    private static final Random RANDOM = new Random();

    public static String randomColor(int len) {
        StringBuilder sb = new StringBuilder(len);
        
        while (sb.length() < len) {
            // 生成一个随机整数，并将其转换为 36 进制字符串
            String randomPart = Integer.toString(RANDOM.nextInt(36), 36);
            sb.append(randomPart);
        }

        // 确保生成的字符串满足长度要求
        return sb.substring(0, len);
    }

    public static void main(String[] args) {
        System.out.println(randomColor(6));  // 生成一个长度为 6 的随机字符串
    }
}