CRC16-CCITT.rar_CCITT_CRC16 CCITT_CRC16-CCITT_crc16 ccitt vc_cr

package com.commu.gb.data; /** * 用户可以直接调用类里面的两个静态方法 * @author xxx * */ public class CRC16 { /** * 得出CRC计算结果 * @param buf 要计算CRC的字符串 * @return 整数 */ public static int getCRC(String buf) { int crc = 0xFFFF; // initial value int polynomial = 0x1021; // 0001 0000 0010 0001 (0, 5, 12) for (int j = 0; j < buf.length(); j++) { char b = buf.charAt(j); for (int i = 0; i < 8; i++) { boolean bit = ((b >> (7 - i) & 1) == 1); boolean c15 = ((crc >> 15 & 1) == 1); crc <<= 1; if (c15 ^ bit) crc ^= polynomial; } } crc &= 0xffff; return crc; } /** * 得出CRC计算结果 * @param buf 要计算CRC的字符串 * @return 字符串,2个字节 */ public static String getCRCString(String buf) { int crc = 0xFFFF; // initial value int polynomial = 0x1021; // 0001 0000 0010 0001 (0, 5, 12) for (int j = 0; j < buf.length(); j++) { char b = buf.charAt(j); for (int i = 0; i < 8; i++) { boolean bit = ((b >> (7 - i) & 1) == 1); boolean c15 = ((crc >> 15 & 1) == 1); crc <<= 1; if (c15 ^ bit) crc ^= polynomial; } } crc &= 0xffff; String str = "" + (char) (crc / 256) + (char) (crc % 256); return str; } public static void main(String[] args) { // 得出CRC计算结果(数字) System.out.println(CRC16.getCRC("hello")); // 得出CRC计算结果(字符串，2个字节) System.out.println(CRC16.getCRCString("hello")); } }