验证密码强度

密码强度验证：

/** * 验证密码强度 * @param passwordStr * @return */public static String checkPassword(String passwordStr) {String str = "^[0-9]{1,20}$";       //不超过20位的数字组合String str1 ="^[a-zA-Z]{1,20}$";         //由字母不超过20位String returnStr = "";if(passwordStr.matches(str)){returnStr = "弱";}else if(passwordStr.matches(str1)){returnStr = "中";}else{returnStr = "强";}return returnStr;}