Java基本类型与byte数组之间相互转换方法
Java基本类型与byte数组之间相互转换，刚刚写的
packagecn.teaey.utils;
importjava.nio.charset.Charset;
publicclassByteUtil
{
publicstaticbyte[]getBytes(shortdata)
{
byte[]bytes=newbyte[2];
bytes[0]=(byte)(data&0xff);
bytes[1]=(byte)((data&0xff00)>>8);
returnbytes;
}
publicstaticbyte[]getBytes(chardata)
{
byte[]bytes=newbyte[2];
bytes[0]=(byte)(data);
bytes[1]=(byte)(data>>8);
returnbytes;
}
publicstaticbyte[]getBytes(intdata)
{
byte[]bytes=newbyte[4];
bytes[0]=(byte)(data&0xff);
bytes[1]=(byte)((data&0xff00)>>8);
bytes[2]=(byte)((data&0xff0000)>>16);
bytes[3]=(byte)((data&0xff000000)>>24);
returnbytes;
}
publicstaticbyte[]getBytes(longdata)
{
byte[]bytes=newbyte[8];
bytes[0]=(byte)(data&0xff);
bytes[1]=(byte)((data>>8)&0xff);
bytes[2]=(byte)((data>>16)&0xff);
bytes[3]=(byte)((data>>24)&0xff);
bytes[4]=(byte)((data>>32)&0xff);
bytes[5]=(byte)((data>>40)&0xff);
bytes[6]=(byte)((data>>48)&0xff);
bytes[7]=(byte)((data>>56)&0xff);
returnbytes;
}
publicstaticbyte[]getBytes(floatdata)
{
intintBits=Float.floatToIntBits(data);
returngetBytes(intBits);
}
publicstaticbyte[]getBytes(doubledata)
{
longintBits=Double.doubleToLongBits(data);
returngetBytes(intBits);
}
publicstaticbyte[]getBytes(Stringdata,StringcharsetName)
{
Charsetcharset=Charset.forName(charsetName);
returndata.getBytes(charset);
}
publicstaticbyte[]getBytes(Stringdata)
{
returngetBytes(data,"GBK");
}
publicstaticshortgetShort(byte[]bytes)
{
return(short)((0xff&bytes[0])|(0xff00&(bytes[1]<<8)));
}
publicstaticchargetChar(byte[]bytes)
{
return(char)((0xff&bytes[0])|(0xff00&(bytes[1]<<8)));
}
publicstaticintgetInt(byte[]bytes)
{
return(0xff&bytes[0])|(0xff00&(bytes[1]<<8))|(0xff0000&(bytes[2]<<16))|(0xff000000&(bytes[3]<<24));
}
publicstaticlonggetLong(byte[]bytes)
{
return(0xffL&(long)bytes[0])|(0xff00L&((long)bytes[1]<<8))|(0xff0000L&((long)bytes[2]<<16))|(0xff000000L&((long)bytes[3]<<24))
|(0xff00000000L&((long)bytes[4]<<32))|(0xff0000000000L&((long)bytes[5]<<40))|(0xff000000000000L&((long)bytes[6]<<48))|(0xff00000000000000L&((long)bytes[7]<<56));
}
publicstaticfloatgetFloat(byte[]bytes)
{
returnFloat.intBitsToFloat(getInt(bytes));
}
publicstaticdoublegetDouble(byte[]bytes)
{
longl=getLong(bytes);
System.out.println(l);
returnDouble.longBitsToDouble(l);
}
publicstaticStringgetString(byte[]bytes,StringcharsetName)
{
returnnewString(bytes,Charset.forName(charsetName));
}
publicstaticStringgetString(byte[]bytes)
{
returngetString(bytes,"GBK");
}
publicstaticvoidmain(String[]args)
{
shorts=122;
inti=122;
longl=1222222;
charc='a';
floatf=122.22f;
doubled=122.22;
Stringstring="我是好孩子";
System.out.println(s);
System.out.println(i);
System.out.println(l);
System.out.println(c);
System.out.println(f);
System.out.println(d);
System.out.println(string);
System.out.println("**************");
System.out.println(getShort(getBytes(s)));
System.out.println(getInt(getBytes(i)));
System.out.println(getLong(getBytes(l)));
System.out.println(getChar(getBytes(c)));
System.out.println(getFloat(getBytes(f)));
System.out.println(getDouble(getBytes(d)));
System.out.println(getString(getBytes(string)));
}
}
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