public class ByteUtil
{
public static byte[] getBytes(short data)
{
byte[] bytes= new byte[2];
bytes[0] = (byte) (data &0xff);
bytes[1] = (byte) ((data & 0xff00)>> 8);
return bytes;
}
public static byte[] getBytes(char data)
{
byte[] bytes= new byte[2];
bytes[0] = (byte) (data);
bytes[1] = (byte) (data >>8);
return bytes;
}
public static byte[] getBytes(int data)
{
byte[] bytes= new byte[4];
bytes[0] = (byte) (data &0xff);
bytes[1] = (byte) ((data & 0xff00)>> 8);
bytes[2] = (byte) ((data & 0xff0000)>> 16);
bytes[3] = (byte) ((data & 0xff000000)>> 24);
return bytes;
}
public static byte[] getBytes(long data)
{
byte[] bytes= new byte[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);
return bytes;
}
public static byte[] getBytes(float data)
{
int intBits =Float.floatToIntBits(data);
return getBytes(intBits);
}
public static byte[] getBytes(double data)
{
long intBits =Double.doubleToLongBits(data);
return getBytes(intBits);
}
public static byte[] getBytes(String data, StringcharsetName)
{
Charset charset = Charset.forName(charsetName);
return data.getBytes(charset);
}
public static byte[] getBytes(String data)
{
return getBytes(data, "GBK");
}
public static short getShort(byte[] bytes)
{
return (short) ((0xff & bytes[0]) | (0xff00& (bytes[1] <<8)));
}
public static char getChar(byte[] bytes)
{
return (char) ((0xff & bytes[0]) | (0xff00& (bytes[1] <<8)));
}
public static int getInt(byte[] bytes)
{
return (0xff& bytes[0]) | (0xff00 & (bytes[1]<< 8)) | (0xff0000 &(bytes[2] << 16)) | (0xff000000& (bytes[3] <<24));
}
public static long getLong(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));
}
public static float getFloat(byte[] bytes)
{
return Float.intBitsToFloat(getInt(bytes));
}
public static double getDouble(byte[] bytes)
{
long l= getLong(bytes);
System.out.println(l);
return Double.longBitsToDouble(l);
}
public static StringgetString(byte[] bytes, StringcharsetName)
{
return new String(bytes, Charset.forName(charsetName));
}
public static StringgetString(byte[] bytes)
{
return getString(bytes, "GBK");
}
public static void main(String[] args)
{
short s =122;
int i =122;
long l =1222222;
char c= 'a';
float f =122.22f;
double d =122.22;
String string = "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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