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

package cn.teaey.utils;

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)));
 }

}