java byte数组与int,long,short,byte的转换实现方法
实例如下：
publicclassDataTypeChangeHelper{
/**
*将一个单字节的byte转换成32位的int
*
*@paramb
*byte
*@returnconvertresult
*/
publicstaticintunsignedByteToInt(byteb){
return(int)b&0xFF;
}
/**
*将一个单字节的Byte转换成十六进制的数
*
*@paramb
*byte
*@returnconvertresult
*/
publicstaticStringbyteToHex(byteb){
inti=b&0xFF;
returnInteger.toHexString(i);
}
/**
*将一个4byte的数组转换成32位的int
*
*@parambuf
*bytesbuffer
*@parambyte[]中开始转换的位置
*@returnconvertresult
*/
publicstaticlongunsigned4BytesToInt(byte[]buf,intpos){
intfirstByte=0;
intsecondByte=0;
intthirdByte=0;
intfourthByte=0;
intindex=pos;
firstByte=(0x000000FF&((int)buf[index]));
secondByte=(0x000000FF&((int)buf[index+1]));
thirdByte=(0x000000FF&((int)buf[index+2]));
fourthByte=(0x000000FF&((int)buf[index+3]));
index=index+4;
return((long)(firstByte<<24|secondByte<<16|thirdByte<<8|fourthByte))&0xFFFFFFFFL;
}
/**
*将16位的short转换成byte数组
*
*@params
*short
*@returnbyte[]长度为2
**/
publicstaticbyte[]shortToByteArray(shorts){
byte[]targets=newbyte[2];
for(inti=0;i<2;i++){
intoffset=(targets.length-1-i)*8;
targets[i]=(byte)((s>>>offset)&0xff);
}
returntargets;
}
/**
*将32位整数转换成长度为4的byte数组
*
*@params
*int
*@returnbyte[]
**/
publicstaticbyte[]intToByteArray(ints){
byte[]targets=newbyte[2];
for(inti=0;i<4;i++){
intoffset=(targets.length-1-i)*8;
targets[i]=(byte)((s>>>offset)&0xff);
}
returntargets;
}
/**
*longtobyte[]
*
*@params
*long
*@returnbyte[]
**/
publicstaticbyte[]longToByteArray(longs){
byte[]targets=newbyte[2];
for(inti=0;i<8;i++){
intoffset=(targets.length-1-i)*8;
targets[i]=(byte)((s>>>offset)&0xff);
}
returntargets;
}
/**32位int转byte[]*/
publicstaticbyte[]int2byte(intres){
byte[]targets=newbyte[4];
targets[0]=(byte)(res&0xff);//最低位
targets[1]=(byte)((res>>8)&0xff);//次低位
targets[2]=(byte)((res>>16)&0xff);//次高位
targets[3]=(byte)(res>>>24);//最高位,无符号右移。
returntargets;
}
/**
*将长度为2的byte数组转换为16位int
*
*@paramres
*byte[]
*@returnint
**/
publicstaticintbyte2int(byte[]res){
//res=InversionByte(res);
//一个byte数据左移24位变成0x??000000，再右移8位变成0x00??0000
inttargets=(res[0]&0xff)|((res[1]<<8)&0xff00);//|表示安位或
returntargets;
}
}
以上就是小编为大家带来的javabyte数组与int,long,short,byte的转换实现方法全部内容了，希望大家多多支持毛票票~