/**
* @param byte[]
* @return int
*/
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 from the tail of b (i.e. the low order of int value).
if(j & gt； = 0)
a[I]= b[j]；
other
a[I]= 0； //If b.length is less than 4, the upper bits will be filled with 0.
}
int v 0 =(a[0]& amp； 0x ff)& lt； & lt24; //& amp； 0xff converts byte values into int without any difference, so as to avoid the high-order sign bit being retained after Java automatic type promotion.
int v 1 =(a[ 1]& amp； 0x ff)& lt； & lt 16;
int v2 =(a[2]& amp； 0x ff)& lt； & lt8;
int v3 =(a[3]& amp； 0x ff)；
Returns v0+v1+v2+v3;
}