生成随机数字

/**
 * 生成随机数字
 * @param length
 * @return
 */
protected String randomNum(int length) {
    StringBuffer buffer = null;
    StringBuffer sb = new StringBuffer();
    Random r = new Random();
    r.setSeed(new Date().getTime());

    buffer = new StringBuffer("0123456789");
    int range = buffer.length();
    for (int i = 0; i < length; ++i) {
        sb.append(buffer.charAt(r.nextInt(range)));
    }
    return sb.toString();
}

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