JAVA版CRC検査

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/**
	 *  
	 * 
	 * @param data
	 *             
	 * @return
	 */
	public static String Make_CRC(byte[] data) {
		byte[] buf = new byte[data.length];//  
		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;
	}

package com.kehui.Utils;

/**
 *  
 * 
 */
public class CRC16Modbus {
	private static final int[] TABLE = { 0x0000, 0xc0c1, 0xc181, 0x0140,
			0xc301, 0x03c0, 0x0280, 0xc241, 0xc601, 0x06c0, 0x0780, 0xc741,
			0x0500, 0xc5c1, 0xc481, 0x0440, 0xcc01, 0x0cc0, 0x0d80, 0xcd41,
			0x0f00, 0xcfc1, 0xce81, 0x0e40, 0x0a00, 0xcac1, 0xcb81, 0x0b40,
			0xc901, 0x09c0, 0x0880, 0xc841, 0xd801, 0x18c0, 0x1980, 0xd941,
			0x1b00, 0xdbc1, 0xda81, 0x1a40, 0x1e00, 0xdec1, 0xdf81, 0x1f40,
			0xdd01, 0x1dc0, 0x1c80, 0xdc41, 0x1400, 0xd4c1, 0xd581, 0x1540,
			0xd701, 0x17c0, 0x1680, 0xd641, 0xd201, 0x12c0, 0x1380, 0xd341,
			0x1100, 0xd1c1, 0xd081, 0x1040, 0xf001, 0x30c0, 0x3180, 0xf141,
			0x3300, 0xf3c1, 0xf281, 0x3240, 0x3600, 0xf6c1, 0xf781, 0x3740,
			0xf501, 0x35c0, 0x3480, 0xf441, 0x3c00, 0xfcc1, 0xfd81, 0x3d40,
			0xff01, 0x3fc0, 0x3e80, 0xfe41, 0xfa01, 0x3ac0, 0x3b80, 0xfb41,
			0x3900, 0xf9c1, 0xf881, 0x3840, 0x2800, 0xe8c1, 0xe981, 0x2940,
			0xeb01, 0x2bc0, 0x2a80, 0xea41, 0xee01, 0x2ec0, 0x2f80, 0xef41,
			0x2d00, 0xedc1, 0xec81, 0x2c40, 0xe401, 0x24c0, 0x2580, 0xe541,
			0x2700, 0xe7c1, 0xe681, 0x2640, 0x2200, 0xe2c1, 0xe381, 0x2340,
			0xe101, 0x21c0, 0x2080, 0xe041, 0xa001, 0x60c0, 0x6180, 0xa141,
			0x6300, 0xa3c1, 0xa281, 0x6240, 0x6600, 0xa6c1, 0xa781, 0x6740,
			0xa501, 0x65c0, 0x6480, 0xa441, 0x6c00, 0xacc1, 0xad81, 0x6d40,
			0xaf01, 0x6fc0, 0x6e80, 0xae41, 0xaa01, 0x6ac0, 0x6b80, 0xab41,
			0x6900, 0xa9c1, 0xa881, 0x6840, 0x7800, 0xb8c1, 0xb981, 0x7940,
			0xbb01, 0x7bc0, 0x7a80, 0xba41, 0xbe01, 0x7ec0, 0x7f80, 0xbf41,
			0x7d00, 0xbdc1, 0xbc81, 0x7c40, 0xb401, 0x74c0, 0x7580, 0xb541,
			0x7700, 0xb7c1, 0xb681, 0x7640, 0x7200, 0xb2c1, 0xb381, 0x7340,
			0xb101, 0x71c0, 0x7080, 0xb041, 0x5000, 0x90c1, 0x9181, 0x5140,
			0x9301, 0x53c0, 0x5280, 0x9241, 0x9601, 0x56c0, 0x5780, 0x9741,
			0x5500, 0x95c1, 0x9481, 0x5440, 0x9c01, 0x5cc0, 0x5d80, 0x9d41,
			0x5f00, 0x9fc1, 0x9e81, 0x5e40, 0x5a00, 0x9ac1, 0x9b81, 0x5b40,
			0x9901, 0x59c0, 0x5880, 0x9841, 0x8801, 0x48c0, 0x4980, 0x8941,
			0x4b00, 0x8bc1, 0x8a81, 0x4a40, 0x4e00, 0x8ec1, 0x8f81, 0x4f40,
			0x8d01, 0x4dc0, 0x4c80, 0x8c41, 0x4400, 0x84c1, 0x8581, 0x4540,
			0x8701, 0x47c0, 0x4680, 0x8641, 0x8201, 0x42c0, 0x4380, 0x8341,
			0x4100, 0x81c1, 0x8081, 0x4040 };

	private int sum = 0xFFFF;

	public long getValue() {
		return sum;
	}

	public void reset() {
		sum = 0xFFFF;
	}

	public void update(byte[] b, int off, int len) {
		for (int i = off; i < off + len; i++)
			update((int) b[i]);
	}

	public void update(int b) {
		sum = (sum >> 8) ^ TABLE[((sum) ^ (b & 0xff)) & 0xff];
	}

	public byte[] getCrcBytes() {
		long crc = (int) this.getValue();
		byte[] byteStr = new byte[2];
		byteStr[0] = (byte) ((crc & 0x000000ff));
		byteStr[1] = (byte) ((crc & 0x0000ff00) >>> 8);
		return byteStr;
	}

}

               /**   */
		byte[] c = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
		/**   */
		CRC16Modbus crc = new CRC16Modbus();
		for (int d : c) {
			crc.update(d);
		}
		byte[] byteStr = new byte[2];//byteStr 
		byteStr[0] = (byte) ((crc.getValue() & 0x000000ff));
		byteStr[1] = (byte) ((crc.getValue() & 0x0000ff00) >>> 8);