double_project/src/utils/ValidationUtil.java

package utils;

import java.util.regex.Pattern;

public class ValidationUtil {

    public static boolean isValidEmail(String email) {
        String emailRegex = "^[A-Za-z0-9+_.-]+@(.+)$";
        return Pattern.compile(emailRegex).matcher(email).matches();
    }

    public static boolean isValidPassword(String password) {
        // 6-10位，必须包含大小写字母和数字
        if (password.length() < 6 || password.length() > 10) {
            return false;
        }

        boolean hasUpperCase = false;
        boolean hasLowerCase = false;
        boolean hasDigit = false;

        for (char c : password.toCharArray()) {
            if (Character.isUpperCase(c)) hasUpperCase = true;
            if (Character.isLowerCase(c)) hasLowerCase = true;
            if (Character.isDigit(c)) hasDigit = true;
        }

        return hasUpperCase && hasLowerCase && hasDigit;
    }

    public static boolean isNumeric(String str) {
        try {
            Double.parseDouble(str);
            return true;
        } catch (NumberFormatException e) {
            return false;
        }
    }
}