Bytes to float int String Double

package com.helo.datReader;

import java.nio.charset.Charset;

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 = 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)));  
    }  
}