common_helper/src/main/java/com/xiongyingqi/util/DynamicPassword.java
public byte[] generateKey(int length) {
        if (length <= 0) {
            throw new IllegalArgumentException("长度为：" + length + "， 指定的密钥长度错误！");
        }
        byte[] bts = new byte[length];

        Random random = new Random();
        for (int i = 0; i < length; i++) {
            bts[i] = (byte) random.nextInt(255);
        }
        return bts;
    }
public byte[] generateKey(int length) {
        if (length <= 0) {
            throw new IllegalArgumentException("长度为：" + length + "， 指定的密钥长度错误！");
        }
        byte[] bts = new byte[length];

        Random random = new Random();
        for (int i = 0; i < length; i++) {
            bts[i] = (byte) random.nextInt(255);
        }
        return bts;
    }
随机生成指定长度字节数的密钥
<br>2014-2-11 下午9:10:17

@param length
@return byte[]