java int to byte and long to byte

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In network programming, due to the need to save bandwidth or encoding, it is usually necessary to process long and int natively instead of converting to string.

public class ByteOrderUtils {

public static byte[] int2byte(int res) {
byte[] targets = new byte[4];

targets[3] = (byte) (res & 0xff); // lowest Bit
targets[2] = (byte) ((res >> 8) & 0xff);// Second low bit
targets[1] = (byte) ((res >> 16) & 0xff);/ / Second highest bit
targets[0] = (byte) (res >>> 24); // Highest bit, unsigned right shift.
return targets;
}

public static int byteArrayToInt(byte[] b){
byte[] a = new byte[4];
int i = a.length - 1,j = b.length - 1;
for (; i >= 0 ; i--,j--) {//Copy data starting from the tail of b (that is, the low bit of the int value)
if(j >= 0)
a[i] = b [j];
else
a[i] = 0;//If b.length is less than 4, fill the high bit with 0
}
int v0 = (a[0] & 0xff) c1fe1d106f8afa409a8fcb64d17ebf77> offset) & 0xff);
}
return buffer;
}

public static long byteArrayToLong(byte[] b){
long values ​​= 0;
for (int i = 0; i < 8 ; i++) {
values ​​<<= 8; values|= (b[i] & 0xff);
}
return values;
}

}

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