JAVA版CRC校验

<span style="white-space:pre">	</span>/**
	 * 计算产生校验码
	 *
	 * @param data
	 *            需要校验的数据
	 * @return
	 */
	public static String Make_CRC(byte[] data) {
		byte[] buf = new byte[data.length];// 存储需要产生校验码的数据
		for (int i = 0; i < data.length; i++) {
			buf[i] = data[i];
		}
		int len = buf.length;
		int crc = 0xFFFF;
		for (int pos = 0; pos < len; pos++) {
			if (buf[pos] < 0) {
				crc ^= (int) buf[pos] + 256; // XOR byte into least sig. byte of
												// crc
			} else {
				crc ^= (int) buf[pos]; // XOR byte into least sig. byte of crc
			}
			for (int i = 8; i != 0; i--) { // Loop over each bit
				if ((crc & 0x0001) != 0) { // If the LSB is set
					crc >>= 1; // Shift right and XOR 0xA001
					crc ^= 0xA001;
				} else
					// Else LSB is not set
					crc >>= 1; // Just shift right
			}
		}
		String c = Integer.toHexString(crc);
		if (c.length() == 4) {
			c = c.substring(2, 4) + c.substring(0, 2);
		} else if (c.length() == 3) {
			c = "0" + c;
			c = c.substring(2, 4) + c.substring(0, 2);
		} else if (c.length() == 2) {
			c = "0" + c.substring(1, 2) + "0" + c.substring(0, 1);
		}
		return c;
	}