本文主要是介绍[android]通讯中常用到的Helper，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
之前在JT/T 794在android上实现时用到了不少类型转换的Helper，现将其公布出来，有需要的朋友拿去用吧。1.常用类型和byte[]互转的ByteHelper；
2.BCD码压缩的BCDHelper；
3.CRC、XOR的CheckHelper 。
package com.van.base;import java.io.UnsupportedEncodingException;public class ByteHelper {/*** @Title: UInt16ToByte2* @Description: TODO(将UInt16转化为byte2)** @param Val* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] UInt16ToByte2(Integer Val) {byte[] bts = new byte[2];bts[0] = (byte) ((0xff00 & Val) >> 8);bts[1] = (byte) (0xff & Val);return bts;}/*** @Title: UInt16ToByte2* @Description: TODO(将UInt16转化为byte2)** @param i* @param bts* @param offset* @return:void** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static void UInt16ToByte2(Integer i, byte[] bts, int offset) {byte[] btsTemp = UInt16ToByte2(i);int index = 0;while (index < 2) {bts[index + offset] = btsTemp[index];index += 1;}}/*** @Title: Int16ToByte2* @Description: TODO(将Int16转化为byte2)** @param Val* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] Int16ToByte2(Short Val) {byte[] bts = new byte[2];bts[0] = (byte) ((Val >> 8) & 0xff);bts[1] = (byte) (Val & 0xff);return bts;}/*** @Title: Int16ToByte2* @Description: TODO(将Int16转化为byte2)** @param i* @param bts* @param offset* @return:void** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static void Int16ToByte2(Short i, byte[] bts, int offset) {byte[] btsTemp = Int16ToByte2(i);int index = 0;while (index < 2) {bts[index + offset] = btsTemp[index];index += 1;}}/*** @Title: UIntToByte4* @Description: TODO(将Uint32转化为byte4)** @param Val* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] UIntToByte4(Long Val) {byte[] bts = new byte[4];bts[0] = (byte) ((0xff000000L & Val) >> 24);bts[1] = (byte) ((0xff0000 & Val) >> 16);bts[2] = (byte) ((0xff00 & Val) >> 8);bts[3] = (byte) (0xff & Val);return bts;}/*** @Title: UIntToByte4* @Description: TODO(将Uint32转化为byte4)** @param i* @param bts* @param offset* @return:void** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static void UIntToByte4(Long i, byte[] bts, int offset) {byte[] btsTemp = UIntToByte4(i);int index = 0;while (index < 4) {bts[index + offset] = btsTemp[index];index += 1;}}/*** @Title: IntToByte4* @Description: TODO(将int32转化为byte4)** @param Val* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] IntToByte4(Integer Val) {byte[] bts = new byte[4];bts[0] = (byte) ((0xff000000 & Val) >> 24);bts[1] = (byte) ((0xff0000 & Val) >> 16);bts[2] = (byte) ((0xff00 & Val) >> 8);bts[3] = (byte) (0xff & Val);return bts;} /*** @Title: IntToByte4* @Description: TODO(将int32转化为byte4)** @param i* @param bts* @param offset* @return:void** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static void IntToByte4(Integer i, byte[] bts, int offset) {byte[] btsTemp = IntToByte4(i);int index = 0;while (index < 4) {bts[index + offset] = btsTemp[index];index += 1;}}/*** @Title: FloatToByte4* @Description: TODO(Float转byte4)** @param val* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] FloatToByte4(float val) {return IntToByte4(Float.floatToIntBits(val));} /*** @Title: FloatToByte4* @Description: TODO(Float转byte4)** @param val* @param bts* @param offset* @return:void** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static void FloatToByte4(float val, byte[] bts, int offset) {byte[] btsTemp = FloatToByte4(val);int index = 0;while (index < 4) {bts[index + offset] = btsTemp[index];index += 1;}}/*** @Title: Byte2ToInt16* @Description: TODO(Byte2转int16)* * @param bt1* @param bt2* @return* @return:short* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static short Byte2ToInt16(byte bt1, byte bt2) {return (short) ((bt1 & 0xff) << 8 | bt2 & 0xff);}/*** @Title: Byte2ToInt16* @Description: TODO(Byte2转int16)* * @param bts* @param offset* @return* @return:short* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static short Byte2ToInt16(byte[] bts, int offset) {return Byte2ToInt16(bts[offset], bts[offset + 1]);}/*** @Title: Byte2ToUInt16* @Description: TODO(Byte2转uint16)* * @param bt1* @param bt2* @return* @return:Integer* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static Integer Byte2ToUInt16(byte bt1, byte bt2) {return (int) ((bt1 & 0xff) << 8 | bt2 & 0xff);}/*** @Title: Byte2ToUInt16* @Description: TODO( Byte2转uint16)* * @param bts* @param offset* @return* @return:Integer* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static Integer Byte2ToUInt16(byte[] bts, int offset) {return Byte2ToUInt16(bts[offset], bts[offset + 1]);}/*** @Title: Byte4ToInt32* @Description: TODO(Byte4转int32)* * @param bt1* @param bt2* @param bt3* @param bt4* @return* @return:Integer* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static Integer Byte4ToInt32(byte bt1, byte bt2, byte bt3, byte bt4) {return (bt1 & 0xff) << 24 | (bt2 & 0xff) << 16 | (bt3 & 0xff) << 8| bt4 & 0xff;}/*** @Title: Byte4ToInt32* @Description: TODO(Byte4转int32)* * @param bts* @param offset* @return* @return:Integer* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static Integer Byte4ToInt32(byte[] bts, int offset) {return Byte4ToInt32(bts[offset], bts[offset + 1], bts[offset + 2],bts[offset + 3]);}/*** @Title: Byte4ToUInt32* @Description: TODO(Byte4转uint32)* * @param bt1* @param bt2* @param bt3* @param bt4* @return* @return:long* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static long Byte4ToUInt32(byte bt1, byte bt2, byte bt3, byte bt4) {return (long) Byte4ToInt32(bt1, bt2, bt3, bt4);}/*** @Title: Byte4ToUInt32* @Description: TODO(Byte4转uint32)* * @param bts* @param offset* @return* @return:long* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static long Byte4ToUInt32(byte[] bts, int offset) {return Byte4ToUInt32(bts[offset], bts[offset + 1], bts[offset + 2],bts[offset + 3]);}/*** @Title: Byte4ToFloat* @Description: TODO(Byte4转Float)* * @param bt1* @param bt2* @param bt3* @param bt4* @return* @return:float* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static float Byte4ToFloat(byte bt1, byte bt2, byte bt3, byte bt4) {return Float.intBitsToFloat(Byte4ToInt32(bt1, bt2, bt3, bt4));}/*** @Title: Byte4ToFloat* @Description: TODO(Byte4转Float)* * @param bts* @param offset* @return* @return:float* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static float Byte4ToFloat(byte[] bts, int offset) {return Byte4ToFloat(bts[offset], bts[offset + 1], bts[offset + 2],bts[offset + 3]);}/*** @Title: StringToGBK* @Description: TODO(字符串转GBK编码)* * @param str* @return* @throws UnsupportedEncodingException* @return:byte[]* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static byte[] StringToGBK(String str)throws UnsupportedEncodingException {return str.getBytes("GBK");}/*** @Title: FillSGBK* @Description: TODO(填充GBK编码)* * @param str* @param bts* @param offset* @return* @throws UnsupportedEncodingException* @return:int* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static int FillSGBK(String str, byte[] bts, int offset)throws UnsupportedEncodingException {return FillSGBK(str, bts, offset, 0);}/*** @Title: FillSGBK* @Description: TODO(填充GBK编码)* * @param str* @param bts* @param offset* @param length* @return* @throws UnsupportedEncodingException* @return:int* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static int FillSGBK(String str, byte[] bts, int offset, int length)throws UnsupportedEncodingException {int len = 0;if (str != null) {byte[] tmp = StringToGBK(str);// 填充数据for (int i = 0; i < tmp.length; i++) {bts[offset + i] = tmp[i];}len = tmp.length;}// 补0for (int i = len; i < length; i++) {bts[offset + i] = 0;}return len > length ? len : length;}/*** @Title: GBKToString* @Description: TODO(GBK编码转字符串)* * @param bts* @return* @throws UnsupportedEncodingException* @return:String* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static String GBKToString(byte[] bts)throws UnsupportedEncodingException {return GBKToString(bts, 0);}/*** @Title: GBKToString* @Description: TODO(GBK编码转字符串)* * @param bts* @param offset* @return* @throws UnsupportedEncodingException* @return:String* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static String GBKToString(byte[] bts, int offset)throws UnsupportedEncodingException {return SGBKToString(bts, offset, bts.length - offset);}/*** @Title: SGBKToString* @Description: TODO(GBK编码转字符串(定长字符串))* * @param bts* @param offset* @param count* @return* @throws UnsupportedEncodingException* @return:String* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static String SGBKToString(byte[] bts, int offset, int count)throws UnsupportedEncodingException {return new String(bts, offset, count, "GBK");}/*** @Title: HexStringToBytes* @Description: TODO(HEX字符串转BYTE数组)* * @param hex* @return* @return:byte[]* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static byte[] HexStringToBytes(String hex) {byte[] bts = new byte[hex.length() / 2];for (int i = 0; i < bts.length; i++) {bts[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2),16);}return bts;}/*** @Title: BytesToHexString* @Description: TODO(BYTE数组转HEX字符串)* * @param bts* @return* @return:String* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static String BytesToHexString(byte[] bts) {return BytesToHexString(bts, 0, bts.length);}/*** @Title: BytesToHexString* @Description: TODO(BYTE数组转HEX字符串)* * @param bts* @param offset* @param count* @return* @return:String* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-8* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-8 wanjj v1.0.0 修改原因*/public static String BytesToHexString(byte[] bts, int offset, int count) {StringBuilder sb = new StringBuilder(bts.length * 2);for (int i = 0; i < count; i++) {sb.append(Integer.toHexString(bts[i + offset]));}return sb.toString();}public static int BoolToByte(boolean bl) {return bl ? 1 : 0 << 0;}
}
package com.van.base;import java.io.UnsupportedEncodingException;import android.text.format.Time;public class BCDHelper { /*** @Title: StrToBCD* @Description: TODO(用BCD码压缩数字字符串)** @param str* @return* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] StrToBCD(String str) {return StrToBCD(str, str.length());}public static byte[] StrToBCD(String str, int numlen) {if (numlen % 2 != 0)numlen++;while (str.length() < numlen) {str = "0" + str;}byte[] bStr = new byte[str.length() / 2];char[] cs = str.toCharArray();int i = 0;int iNum = 0;for (i = 0; i < cs.length; i += 2) {int iTemp = 0;if (cs[i] >= '0' && cs[i] <= '9') {iTemp = (cs[i] - '0') << 4;} else {// 判断是否为a~fif (cs[i] >= 'a' && cs[i] <= 'f') {cs[i] -= 32;}iTemp = (cs[i] - '0' - 7) << 4;}// 处理低位if (cs[i + 1] >= '0' && cs[i + 1] <= '9') {iTemp += cs[i + 1] - '0';} else {// 判断是否为a~fif (cs[i + 1] >= 'a' && cs[i + 1] <= 'f') {cs[i + 1] -= 32;}iTemp += cs[i + 1] - '0' - 7;}bStr[iNum] = (byte) iTemp;iNum++;}return bStr;}/*** @Title: bcdToInt* @Description: TODO(BCD转int)** @param bcdNum* @param offset* @param numlen* @return* @return:int** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static int bcdToInt(byte[] bcdNum, int offset, int numlen) {return Integer.parseInt(bcdToString(bcdNum, offset, numlen));}/*** @Title: bcdToString* @Description: TODO(BCD转字符串)** @param bcdNum* @param offset* @param numlen* @return* @return:String** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static String bcdToString(byte[] bcdNum, int offset, int numlen) {int len = numlen / 2;if (numlen % 2 != 0)len++;StringBuffer sb = new StringBuffer();for (int i = 0; i < len; i++) {sb.append(Integer.toHexString((bcdNum[i + offset] & 0xf0) >> 4));sb.append(Integer.toHexString(bcdNum[i + offset] & 0xf));}return sb.toString();}/*** @Title: Bcd3ToDateTime* @Description: TODO(BCD码转日期)** @param data* @param offset* @return* @return:Time** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static Time Bcd3ToDateTime(byte[] data, int offset) {int year = 0, month = 0, monthDay = 0;year = Integer.parseInt("20" + bcdToString(data, offset, 2));month = bcdToInt(data, offset + 1, 2);monthDay = bcdToInt(data, offset + 2, 2);Time time = new Time("GMT+8");time.set(monthDay, month, year);return time;}public static Time Bcd5ToDateTime(byte[] data, int offset) {int year = 0, month = 0, monthDay = 0, hour = 0, minute = 0, second = 0;year = Integer.parseInt("20" + bcdToString(data, offset, 2));month = bcdToInt(data, offset + 1, 2);monthDay = bcdToInt(data, offset + 2, 2);hour = bcdToInt(data, offset + 3, 2);minute = bcdToInt(data, offset + 4, 2);Time time = new Time("GMT+8");time.set(second, minute, hour, monthDay, month, year);return time;} /*** @Title: Bcd6ToDateTime* @Description: TODO(BCD码转时间格式)** @param data* @param offset* @return* @return:Time** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static Time Bcd6ToDateTime(byte[] data, int offset) {int year = 0, month = 0, monthDay = 0, hour = 0, minute = 0, second = 0;year = Integer.parseInt("20" + bcdToString(data, offset, 2));month = bcdToInt(data, offset + 1, 2);monthDay = bcdToInt(data, offset + 2, 2);hour = bcdToInt(data, offset + 3, 2);minute = bcdToInt(data, offset + 4, 2);second = bcdToInt(data, offset + 5, 2);Time time = new Time("GMT+8");time.set(second, minute, hour, monthDay, month, year);return time;}public static Time Bcd7ToDateTime(byte[] data, int offset) {int year = 0, month = 0, monthDay = 0, hour = 0, minute = 0, second = 0;year = bcdToInt(data, offset, 4);month = bcdToInt(data, offset + 2, 2);monthDay = bcdToInt(data, offset + 3, 2);hour = bcdToInt(data, offset + 4, 2);minute = bcdToInt(data, offset + 5, 2);second = bcdToInt(data, offset + 6, 2);Time time = new Time("GMT+8");time.set(second, minute, hour, monthDay, month, year);return time;}/*** @Title: DateTimeToBcd3* @Description: TODO(日期转BCD码)** @param dt* @return* @throws UnsupportedEncodingException* @return:byte[]** @version: v1.0.0* @author: WANJJ* @date: 2011-11-17* * Modification History: * Date Author Version Description* ---------------------------------------------------------** 2011-11-17 wanjj v1.0.0 修改原因*/public static byte[] DateTimeToBcd3(Time dt)throws UnsupportedEncodingException {StringBuilder sb = new StringBuilder();sb.append(FStrLen(String.valueOf((dt.year - 2000)), 2));sb.append(FStrLen(String.valueOf((dt.month)), 2));sb.append(FStrLen(String.valueOf((dt.monthDay)), 2));return StrToBCD(sb.toString());}public static byte[] DateTimeToBcd5(Time dt)throws UnsupportedEncodingException {StringBuilder sb = new StringBuilder();sb.append(FStrLen(String.valueOf((dt.year - 2000)), 2));sb.append(FStrLen(String.valueOf(dt.month), 2));sb.append(FStrLen(String.valueOf(dt.monthDay), 2));sb.append(FStrLen(String.valueOf(dt.hour), 2));sb.append(FStrLen(String.valueOf(dt.minute), 2));return StrToBCD(sb.toString());}public static byte[] DateTimeToBcd6(Time dt)throws UnsupportedEncodingException {StringBuilder sb = new StringBuilder();sb.append(FStrLen(String.valueOf((dt.year - 2000)), 2));sb.append(FStrLen(String.valueOf(dt.month), 2));sb.append(FStrLen(String.valueOf(dt.monthDay), 2));sb.append(FStrLen(String.valueOf(dt.hour), 2));sb.append(FStrLen(String.valueOf(dt.minute), 2));sb.append(FStrLen(String.valueOf(dt.second), 2));return StrToBCD(sb.toString());}public static byte[] DateTimeToBcd7(Time dt)throws UnsupportedEncodingException {StringBuilder sb = new StringBuilder();sb.append(FStrLen(String.valueOf(dt.year), 4));sb.append(FStrLen(String.valueOf(dt.month), 2));sb.append(FStrLen(String.valueOf(dt.monthDay), 2));sb.append(FStrLen(String.valueOf(dt.hour), 2));sb.append(FStrLen(String.valueOf(dt.minute), 2));sb.append(FStrLen(String.valueOf(dt.second), 2));return StrToBCD(sb.toString());}public static String FStrLen(String str, int len) {if (str.length() < len) {str = "0" + str;}return str;}/*** @Title: GetNowTime* @Description: TODO(获取当前GMT+8时间)* * @return* @return:Time* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-9* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-9 wanjj v1.0.0 修改原因*/public static Time GetNowTime() {Time t = GetNewTime();t.setToNow();return t;}public static Time GetNewTime() {return new Time("GMT+8");}/*** @Title: TimeDiff* @Description: TODO(计算两个时间相差毫秒数)* * @param tm1* @param tm2* @return* @return:long* * @version: v1.0.0* @author: WANJJ* @date: 2011-11-11* * Modification History: Date Author Version Description* ---------------------------------------------------------** 2011-11-11 wanjj v1.0.0 修改原因*/public static long TimeDiff(Time tm1, Time tm2) {return (tm1.toMillis(true) - tm2.toMillis(true));}
}
package com.van.base;import java.util.ArrayList;/*** 用户可以直接调用类里面的两个静态方法* * @author WANJJ* */
public class CheckHelper {/*** 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 valueint 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 valueint 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;}/*** 得出异或计算结果* * @param data* 要计算异或的数据* @param offset* 偏移位* @param length* 长度* @return byte*/public static byte CheckXOR(byte[] data, int offset, int length) {byte xda = 0;for (int i = 0; i < length; i++) {xda = (byte) ((data[i + offset] ^ xda) & 0xFF);}return xda;}/*** 校验并转义(异或效验)* * @param data* 要计算异或的数据* @param offset* 偏移位* @param length* 长度* @return byte*/public static void XORAndEscape(ArrayList<Byte> data, int offset, int length) {byte xda = 0;for (int i = offset; i < offset + length; i++) {xda = (byte) (data.get(i) ^ xda);if (data.get(i) == 0x7e)// 转义 向后插入一个0x02{data.set(i, (byte) 0x7d);data.add(i + 1, (byte) 0x02);length++;i++;} else if (data.get(i) == 0x7d)// 转义 向后插入一个0x01{data.add(i + 1, (byte) 0x01);length++;i++;}}data.add(offset + length, xda);if (xda == 0x7e)// 转义 向后插入一个0x02data.add(offset + length + 1, (byte) 0x02);else if (xda == 0x7d)// 转义 向后插入一个0x01data.add(offset + length + 1, (byte) 0x01);}
}
这篇关于[android]通讯中常用到的Helper的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
