JAVA版CRC校验

<span style="color:#ff0000;">英文的校验：</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;
}

含中文的校验：

CRC16Modbus类

package com.kehui.Utils;

/**
* 用于计算含有中文的校验
*
*/
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;
}

}
使用的时候写：

/** 需要产生校验码的数据 */
byte[] c = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
/** 计算校验码 */
CRC16Modbus crc = new CRC16Modbus();
for (int d : c) {
crc.update(d);
}
byte[] byteStr = new byte[2];<span style="color:#ff0000;">//<span style="font-family: Arial, Helvetica, sans-serif;">byteStr即为所求</span></span>
byteStr[0] = (byte) ((crc.getValue() & 0x000000ff));
byteStr[1] = (byte) ((crc.getValue() & 0x0000ff00) >>> 8);