Java 记录java基本类型与Byte数组之间相互转换

来源：互联网发布：汽车设计外观软件编辑：程序博客网时间：2024/04/29 14:14
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 = "welcome";        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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