Byte[] 转换 截取等操作
1、工作中用到的与Byte[]相关方法工具类。记录一下
包含：16进制字符串转换Byte[]、Byte[]转换成16进制字符、字符串转换成十六进制字符串、16进制直接转换成为字符串(无需Unicode解码)、校验和、Byte[]截取指定长度数组、BCD码转为10进制串(阿拉伯数据)、int与byte 互转、byte[]转int高低位互换、
byte[]转int 、byte[]与short 互转、10进制串转为BCD码
/**
* 把16进制字符串转换成字节数组
* @param hexString
* @return byte[]
*/
public static byte[] hexStringToByte(String hex) {
if ((hex == null) || (hex.equals(""))){
return null;
}
else if (hex.length()%2 != 0){
return null;
}
else{
hex = hex.toUpperCase();
int len = hex.length()/2;
byte[] b = new byte[len];
char[] hc = hex.toCharArray();
for (int i=0; i> 4;
sb.append(chars[bit]);
bit = bs[i] & 0x0f;
sb.append(chars[bit]);
}
return sb.toString();
}
/**
* 16进制直接转换成为字符串(无需Unicode解码)
* @param hexStr
* @return
*/
public static String hexStr2Str(String hexStr) {
String str = "0123456789ABCDEF";
char[] hexs = hexStr.toCharArray();
byte[] bytes = new byte[hexStr.length() / 2];
int n;
for (int i = 0; i < bytes.length; i++) {
n = str.indexOf(hexs[2 * i]) * 16;
n += str.indexOf(hexs[2 * i + 1]);
bytes[i] = (byte) (n & 0xff);
}
return new String(bytes);
}
/**
* 校验和
* @param data
* @return
*/
public static String makeChecksum(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);
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 = Integer.toHexString(mod);
len = hex.length();
// 如果不够校验位的长度，补0,这里用的是两位校验
if (len < 2) {
hex = "0" + hex;
}
return hex.toUpperCase();
}
/**
* 截取指定长度数组
* @param src
* @param begin
* @param count
* @return
*/
public static byte[] subBytes(byte[] src, int begin, int count) {
byte[] bs = new byte[count];
System.arraycopy(src, begin, bs, 0, count);
return bs;
}
/**
* @功能: BCD码转为10进制串(阿拉伯数据)
* @参数: BCD码
* @结果: 10进制串
*/
public static String bcd2Str(byte[] bytes) {
StringBuffer temp = new StringBuffer(bytes.length * 2);
for (int i = 0; i < bytes.length; i++) {
temp.append((byte) ((bytes[i] & 0xf0) >>> 4));
temp.append((byte) (bytes[i] & 0x0f));
}
return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp
.toString().substring(1) : temp.toString();
}
/**
* int转byte
* @param x
* @return
*/
public static byte intToByte(int x) {
return (byte) x;
}
/**
* byte转int
* @param b
* @return
*/
public static int byteToInt(byte b) {
//Java的byte是有符号，通过 &0xFF转为无符号
return b & 0xFF;
}
/**
* byte[]转int
* @param b
* @return
*/
public static int byteArrayToInt(byte[] b) {
return b[3] & 0xFF |
(b[2] & 0xFF) << 8 |
(b[1] & 0xFF) << 16 |
(b[0] & 0xFF) << 24;
}
public static int byteArrayToInt(byte[] b, int index){
return b[index+3] & 0xFF |
(b[index+2] & 0xFF) << 8 |
(b[index+1] & 0xFF) << 16 |
(b[index+0] & 0xFF) << 24;
}
/**
* byte[]转int高低位互换
* @param b
* @return
*/
public static int highLowExchangeToInt(byte[] b) {
return b[0] & 0xFF | (b[1] & 0xFF) << 8;
}
/**
* 将byte数组转int
* 正常情况下4个byte可以转换成一个int
* 当数组不足4只需要高位补上就行
* @param b
* @return
*/
public static int byteArrToInt(byte[] b) {
int s =0;
if(b.length == 1) {
s = b[0] & 0xFF;
}else if(b.length == 2) {
s = b[1] & 0xFF | (b[0] & 0xFF) << 8 ;
}else if(b.length ==3) {
s = b[2] & 0xFF | (b[1] & 0xFF) << 8 | (b[0] & 0xFF) << 16 ;
}else {
s = b[3] & 0xFF | (b[2] & 0xFF) << 8 | (b[1] & 0xFF) << 16 | (b[0] & 0xFF) << 24;
}
return s;
}
/**
* int转byte[]
* @param a
* @return
*/
public static byte[] intToByteArray(int a) {
return new byte[] {
(byte) ((a >> 24) & 0xFF),
(byte) ((a >> 16) & 0xFF),
(byte) ((a >> 8) & 0xFF),
(byte) (a & 0xFF)
};
}
/**
* short转byte[]
*
* @param b
* @param s
* @param index
*/
public static void byteArrToShort(byte b[], short s, int index) {
b[index + 1] = (byte) (s >> 8);
b[index + 0] = (byte) (s >> 0);
}
/**
* byte[]转short
*
* @param b
* @param index
* @return
*/
public static short byteArrToShort(byte[] b, int index) {
return (short) (((b[index + 0] << 8) | b[index + 1] & 0xff));
}
/**
* 16位short转byte[]
*
* @param s
* short
* @return byte[]
* */
public static byte[] shortToByteArr(short s) {
byte[] targets = new byte[2];
for (int i = 0; i < 2; i++) {
int offset = (targets.length - 1 - i) * 8;
targets[i] = (byte) ((s >>> offset) & 0xff);
}
return targets;
}
/**
* byte[]转16位short
* @param b
* @return
*/
public static short byteArrToShort(byte[] b){
return byteArrToShort(b,0);
}
/**
* 流转换为byte[]
* @param inStream
* @return
*/
public static byte[] readInputStream(InputStream inStream) {
ByteArrayOutputStream outStream = null;
try {
outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
byte[] data = null;
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
data = outStream.toByteArray();
return data;
}catch (IOException e) {
return null;
} finally {
try {
if (outStream != null) {
outStream.close();
}
if (inStream != null) {
inStream.close();
}
} catch (IOException e) {
return null;
}
}
}
/**
* byte[]转inputstream
* @param b
* @return
*/
public static InputStream readByteArr(byte[] b){
return new ByteArrayInputStream(b);
}
/**
* 字节数组转16进制字符串
* @param b
* @return
*/
public static String byteArrToHexString(byte[] b){
String result="";
for (int i=0; i < b.length; i++) {
result += Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring(1);
}
return result;
}
/**
* 16进制字符创转int
* @param hexString
* @return
*/
public static int hexStringToInt(String hexString){
return Integer.parseInt(hexString,16);
}
/**
* 十进制转二进制
* @param i
* @return
*/
public static String intToBinary(int i){
return Integer.toBinaryString(i);
}
/**
* int转16进制
* @param b
* @return
*/
public static String intToHex16(int b) {
return String.format("%02x", b);
}
/**
* int转hex 长度不够前面补零
* @param b
* @param length
* @return
*/
public static String intToHexByLength(int b,int byteLength) {
int length = byteLength*2;
String hex = intToHex16(b);
hex = hex.length() > 8;
}
hex = hex.length()<4?hex+"00":hex;
return hex;
}
/**
* @函数功能: 10进制串转为BCD码
* @输入参数: 10进制串
* @输出结果: BCD码
*/
public static byte[] str2Bcd(String asc) {
int len = asc.length();
int mod = len % 2;
if (mod != 0) {
asc = "0" + asc;
len = asc.length();
}
byte abt[] = new byte[len];
if (len >= 2) {
len = len / 2;
}
byte bbt[] = new byte[len];
abt = asc.getBytes();
int j, k;
for (int p = 0; p < asc.length()/2; p++) {
if ( (abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {
j = abt[2 * p] - '0';
} else if ( (abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {
j = abt[2 * p] - 'a' + 0x0a;
} else {
j = abt[2 * p] - 'A' + 0x0a;
}
if ( (abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {
k = abt[2 * p + 1] - '0';
} else if ( (abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {
k = abt[2 * p + 1] - 'a' + 0x0a;
}else {
k = abt[2 * p + 1] - 'A' + 0x0a;
}
int a = (j << 4) + k;
byte b = (byte) a;
bbt[p] = b;
}
return bbt;
}