java中long,int,short与byte数组之间的转换

//long类型转成byte数组
public static byte[] longToByte(long number) {
long temp = number;
byte[] b = new byte[8];
for (int i = 0; i < b.length; i++) {
b[i] = new Long(temp & 0xff).byteValue();// 将最低位保存在最低位
temp = temp >> 8; // 向右移8位
}
return b;
}
//byte数组转成long
public static long byteToLong(byte[] b) {
long s = 0;
long s0 = b[0] & 0xff;// 最低位
long s1 = b[1] & 0xff;
long s2 = b[2] & 0xff;
long s3 = b[3] & 0xff;
long s4 = b[4] & 0xff;// 最低位
long s5 = b[5] & 0xff;
long s6 = b[6] & 0xff;
long s7 = b[7] & 0xff;
// s0不变
s1 <<= 8;
s2 <<= 16;
s3 <<= 24;
s4 <<= 8 * 4;
s5 <<= 8 * 5;
s6 <<= 8 * 6;
s7 <<= 8 * 7;
s = s0 | s1 | s2 | s3 | s4 | s5 | s6 | s7;
return s;
}
/**
* 注释：int到字节数组的转换！
*
* @param number
* @return
*/
public static byte[] intToByte(int number) {
int temp = number;
byte[] b = new byte[4];
for (int i = 0; i < b.length; i++) {
b[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位
temp = temp >> 8; // 向右移8位
}
return b;
}
/**
* 注释：字节数组到int的转换！
*
* @param b
* @return
*/
public static int byteToInt(byte[] b) {
int s = 0;
int s0 = b[0] & 0xff;// 最低位
int s1 = b[1] & 0xff;
int s2 = b[2] & 0xff;
int s3 = b[3] & 0xff;
s3 <<= 24;
s2 <<= 16;
s1 <<= 8;
s = s0 | s1 | s2 | s3;
return s;
}
/**
* 注释：short到字节数组的转换！
*
* @param s
* @return
*/
public static byte[] shortToByte(short number) {
int temp = number;
byte[] b = new byte[2];
for (int i = 0; i < b.length; i++) {
b[i] = new Integer(temp & 0xff).byteValue();// 将最低位保存在最低位
temp = temp >> 8; // 向右移8位
}
return b;
}
/**
* 注释：字节数组到short的转换！
*
* @param b
* @return
*/
public static short byteToShort(byte[] b) { short s = 0;
short s0 = (short) (b[0] & 0xff);// 最低位 short s1 = (short) (b[1] & 0xff);
s1 <<= 8;
s = (short) (s0 | s1);
return s;
}。