Java short long int 与byte数组之间相互转换

Java基本类型与byte数组之间相互转换，

这几天一直用json。 好久没用过byte了，现在用socket，全部是byte，所以整理了下

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, String charsetName)

    {

        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 String getString(byte[] bytes, String charsetName)

    {

        return new String(bytes, Charset.forName(charsetName));

    }

 

    public static String getString(byte[] bytes)

    {

        return getString(bytes, "GBK");

    }

 

    

    public static void main(String[] args)

    {

        short s = 200;

        int i = 201;

        long l = 222222;

        char c = 'a';

        float f = 122.22f;

        double d = 122.22;

        String string = "我是Ai相册开发";

        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)));

    }

}