随机密码生成器java

可以使用Java的SecureRandom类生成随机密码，代码如下：

import java.security.SecureRandom;

public class RandomPasswordGenerator {

    private static final String CHAR_LOWER = "abcdefghijklmnopqrstuvwxyz";
    private static final String CHAR_UPPER = CHAR_LOWER.toUpperCase();
    private static final String NUMBER = "0123456789";
    private static final String OTHER_CHAR = "!@#$%&*()_+-=[]?";

    private static final String PASSWORD_ALLOW_BASE = CHAR_LOWER + CHAR_UPPER + NUMBER + OTHER_CHAR;
    private static SecureRandom random = new SecureRandom();

    public static void main(String[] args) {
        int length = 10;

        // generate a random password
        String password = generateRandomPassword(length);
        System.out.println("Password: " + password);
    }

    public static String generateRandomPassword(int length) {
        if (length < 1) {
            throw new IllegalArgumentException("Invalid password length");
        }

        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            int rndCharAt = random.nextInt(PASSWORD_ALLOW_BASE.length());
            char rndChar = PASSWORD_ALLOW_BASE.charAt(rndCharAt);
            sb.append(rndChar);
        }

        return sb.toString();
    }
}

在上面的代码中，我们定义了一个包含小写字母、大写字母、数字和其他符号的字符集，然后使用SecureRandom类来生成随机字符并将其连接成密码字符串。可以通过调用generateRandomPassword方法来生成指定长度的随机密码。