java中long,int,short与byte数组之间的转换

//long类型转成byte数组
publicstaticbyte[] longToByte(long number){
long temp = number;
byte[] b =newbyte[8];
for(int i =0; i < b.length; i++){
b[i]=newLong(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
publicstaticlong 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
*/
publicstaticbyte[] intToByte(int number){
int temp = number;
byte[] b =newbyte[4];
for(int i =0; i < b.length; i++){
b[i]=newInteger(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
*/
publicstaticint 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
*/
publicstaticbyte[] shortToByte(short number){
int temp = number;
byte[] b =newbyte[2];
for(int i =0; i < b.length; i++){
b[i]=newInteger(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
*/
publicstaticshort 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;
}