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)) | (0xff0upNsbdyq00000 & (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)));

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。