java產生隨機密碼的一個方法

/** * 產生隨機密碼 * @return */public static String makeRandNum() {String str = DateUtils.getCurrLongTime();long time = Long.parseLong(str.substring(6, 14));long num = (long) (Math.random() * 90000000L) + time + 100000L;// 判斷產生的數String cardPass = String.valueOf(num);if (cardPass.length() > 8) {cardPass = cardPass.substring(0, 8);}else if(cardPass.length()<8){StringBuffer nameBuffer = new StringBuffer(cardPass.trim());while (nameBuffer.length() < 8) {nameBuffer.append("0");}cardPass=nameBuffer.toString();}return cardPass;}