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)));
  }
 
}

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