int、char、double與byte相互轉(zhuǎn)換
//整數(shù)到字節(jié)數(shù)組的轉(zhuǎn)換
public static byte[]
intToByte(int number) {
int
temp = number;
byte[]
b=new byte[4];
for
(int i=b.length-1;i>-1;i–){
b[i]
= new Integer(temp&0xff).byteValue(); //將最高位保存在最低位
temp
= temp >> 8; //向右移8位
}
return b;
}
//字節(jié)數(shù)組到整數(shù)的轉(zhuǎn)換
public static int
byteToInt(byte[] b) {
int s
= 0;
for
(int i = 0; i < 3; i++) {
if (b[i] >= 0){
s
= s + b[i];
}else {
s
= s + 256 + b[i];
s = s * 256;
}
}
if
(b[3] >= 0) { //最后一個之所以不乘，是因?yàn)榭赡軙绯?span lang="EN-US">
s = s + b[3];
} else {
s
= s + 256 + b[3];
}
return
s;
}
//字符到字節(jié)轉(zhuǎn)換
public static byte[]
charToByte(char ch){
int
temp=(int)ch;
byte[]
b=new byte[2];
for (int i=b.length-1;i>-1;i–){
b[i]
= new Integer(temp&0xff).byteValue(); //將最高位保存在最低位
temp
= temp >> 8; //向右移8位
}
return
b;
}
//字節(jié)到字符轉(zhuǎn)換
public static char
byteToChar(byte[] b){
int
s=0;
if(b[0]>0)
{
s+=b[0];
} else {
s+=256+b[0];
}
s*=256;
if(b[1]>0) {
s+=b[1];
} else {
s+=256+b[1];
}
char ch=(char)s;
return ch;
}
//浮點(diǎn)到字節(jié)轉(zhuǎn)換
public static byte[]
doubleToByte(double d){
byte[] b=new byte[8];
long l=Double.doubleToLongBits(d);
for(int i=0;i<b.length;i++){
b[i]=new Long(l).byteValue();
l=l>>8;
}
return b;
}
//字節(jié)到浮點(diǎn)轉(zhuǎn)換
public static double
byteToDouble(byte[] b){
long l;
l=b[0];
l&=0xff;
l|=((long)b[1]<<8);
l&=0xffff;
l|=((long)b[2]<<16);
l&=0xffffff;
l|=((long)b[3]<<24);
l&=0xffffffffl;
l|=((long)b[4]<<32);
l&=0xffffffffffl;
l|=((long)b[5]<<40);
l&=0xffffffffffffl;
l|=((long)b[6]<<48);
l|=((long)b[7]<<56);
return Double.longBitsToDouble(l);
}