bytez转String

/*** 字节数组转换成对应的16进制表示的字符串** @param src* @return*/
public static String bytes2HexStr(byte[] src) {StringBuilder builder = new StringBuilder();if (src == null || src.length <= 0) {return "";}char[] buffer = new char[2];for (int i = 0; i < src.length; i++) {buffer[0] = Character.forDigit((src[i] >>> 4) & 0x0F, 16);buffer[1] = Character.forDigit(src[i] & 0x0F, 16);builder.append(buffer);}return builder.toString().toUpperCase();
}/*** 十六进制字节数组转字符串** @param src    目标数组* @param dec    起始位置* @param length 长度* @return*/
public static String bytes2HexStr(byte[] src, int dec, int length) {byte[] temp = new byte[length];System.arraycopy(src, dec, temp, 0, length);return bytes2HexStr(temp);
}

BMSID = new String(bytes2, StandardCharsets.US_ASCII).trim();

字符串转 byte[]——含中文

/*** 字符串转byte数组* @param str* @return*/
public static byte[] strTobytes(String str){byte[] b=null,data=null;try{b = str.getBytes("utf-8");//data = new String(b,"utf-8").getBytes("gbk");data = new String(b,"utf-8").getBytes("gb2312");}catch (UnsupportedEncodingException e){e.printStackTrace();}return data;
}

 

字符串命令转 byte[]——不含中文

/*** 把十六进制表示的字节数组字符串，转换成十六进制字节数组** @param* @return byte[]*/
public static byte[] hexStr2bytes(String hex) {int len = (hex.length() / 2);byte[] result = new byte[len];char[] achar = hex.toUpperCase().toCharArray();for (int i = 0; i < len; i++) {int pos = i * 2;result[i] = (byte) (hexChar2byte(achar[pos]) << 4 | hexChar2byte(achar[pos + 1]));}return result;
}

String与byte转换

String s = "这是一段中文字符串";
byte[] b = new byte[0];
try {
    b = s.getBytes("UTF-8");
    String n = new String(b,"UTF-8");
    LgqLogutil.e(".......==="+n);
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
} 

 byte[]转二进制0010100

public static String convertToBinaryString(byte[] data) {LogPlus.e("###data len   -> " + data.length);StringBuilder sb = new StringBuilder();for (int i = 0, n = data.length; i < n; ++i) {String bin = Integer.toBinaryString(data[i] & 0xFF);StringBuilder binaryStr = new StringBuilder();final int zeroPaddingLen = 8 - bin.length();for (int j = 0; j < zeroPaddingLen; ++j) {binaryStr.append("0");}binaryStr.append(bin);sb.append(binaryStr);}return sb.toString();
}

二进制转十进制转byte[]

 

byte[] dataN = new byte[4];
int[] allLed = new int[32];

int value = Integer.parseInt(convertToBinnaryStr(allLed), 2);

byte[] lengthBytes = ByteUtil.int2Bytes(value, 4);

private String convertToBinnaryStr(int[] allLed) {StringBuilder sb = new StringBuilder();for (int b : allLed) {sb.append(b);}return sb.toString();
}

public static byte[] int2Bytes(int v, int len) {byte[] bytes = new byte[len];for (int i = 0; i < len; i++) {// 高位在前bytes[i] = (byte) ((v >>> (len - i - 1) * 8) & 0xff);}return bytes;
}

 

 byte[]转十进制

public static int byteToInt(byte[] b) {int mask = 0xff;int temp;int n = 0;for (int i = 0; i < b.length; i++) {n <<= 8;temp = b[i] & mask;n |= temp;}return n;
}

byte[]拼接方法

 

byte[] dataN = new byte[6];
byte[] lengthBytes = ByteUtil.int2Bytes(liushui, 4);
System.arraycopy(lengthBytes, 0, dataN, 0, lengthBytes.length);
byte[] buyNumBytes = ByteUtil.int2Bytes(num, 1);
byte[] huodaohaoBytes = ByteUtil.int2Bytes(goodsWayId, 1);
System.arraycopy(huodaohaoBytes, 0, dataN, 4, 1);
System.arraycopy(buyNumBytes, 0, dataN, 5, 1);
setDataN(dataN);

 校验

/*** 异或校验和** @param bytes* @param offset* @param len* @return*/
public static byte getXOR(byte[] bytes, int offset, int len) {// 计算校验和 byte toDiff = 0;// 校验和为除开校验位外的所有数据做异或for (int i = 0; i < len; i++) {toDiff = (byte) (toDiff ^ bytes[i + offset]);}return toDiff;
}

// 计算校验和
byte check = ByteUtil.getXOR(bytes, 0, bytes.length - 1);

 。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。

/*** 总加和校验* @param data 十六进制字符串* @return 返回校验码*/
public static String checksum(String data) {if (data == null || data.equals("")) {return "";}int total = 0;int len = data.length();int num = 0;while (num < len) {String s = data.substring(num, num + 2);System.out.println(s);total += Integer.parseInt(s, 16);num = num + 2;}/*** 用256求余最大是255，即16进制的FF*/int mod = total % 256;String hex =String.format("%02X", mod);return hex;
}

String jiaoyuan = checksum("85"+datas);

 ----------------------------------------------------------------------------

public static byte[] getXOR(byte[] bytes, int len) {byte[] partBytes = new byte[len];System.arraycopy(bytes,0,partBytes,0,partBytes.length);//LogPlus.e("###hex:" + ByteUtil.bytes2HexStr(partBytes));final short POLYNOMIAL = 0x1021;final int INITIAL_REMAINDER = 0xA1EC;final int TOPBIT = 1 << (16 - 1);int remainder = INITIAL_REMAINDER;for (int ibyte = 0; ibyte < len; ++ibyte) {remainder ^= ((partBytes[ibyte]) << (16 - 8));for (int i = 8; i > 0; --i) {if ((remainder & TOPBIT) != 0) {remainder = (remainder << 1) ^ POLYNOMIAL;} else {remainder = (remainder << 1);}}}byte[] crcBytes = new byte[2];return ByteUtil.long2bytes(remainder, crcBytes, 0, 2);}

// 计算校验和
byte check = ByteUtil.getXOR(bytes, 0, bytes.length - 1);