在实际开发中,我们经常遇到与嵌入式进行通信的情况,而由于一些嵌入式设备的处理能力较差,往往以二进制的数据流的形式传输数据,在此将这些常见的转换做一总结。

注意:默认传输时使用小端模式

将字节流转换为int类型数据

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public static int getInt(byte[] bytes) {
return (0xff & bytes[0])
| (0xff00 & (bytes[1] << 8))
| (0xff0000 & (bytes[2] << 16))
| (0xff000000 & (bytes[3] << 24));
}

将字节流转换为long类型数据

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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)));
}

将字节流转换为float类型数据

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public static float getFloat(byte[] bytes){
int temp=getInt(bytes);
return Float.intBitsToFloat(temp);
}

将字节流转换为double类型数据

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public static double getDouble(byte[] bytes){
long temp=getLong(bytes);
return Double.longBitsToDouble(temp);
}

将int类型数据转换为字节流

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public static byte[] getByteFromInt(int data){
byte[] temp=new byte[4];
temp[0]=(byte)(0xFF&(data));
temp[1]=(byte)(0xFF&(data>>8));
temp[2]=(byte)(0xFF&(data>>16));
temp[3]=(byte)(0xFF&(data>>24));
return temp;
}

将long类型数据转换为字节流

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public static byte[] getByteFromLong(long data){
byte[] temp=new byte[8];
temp[0]=(byte)(0xFF&(data));
temp[1]=(byte)(0xFF&(data>>8));
temp[2]=(byte)(0xFF&(data>>16));
temp[3]=(byte)(0xFF&(data>>24));
temp[4]=(byte)(0xFF&(data>>32));
temp[5]=(byte)(0xFF&(data>>40));
temp[6]=(byte)(0xFF&(data>>48));
temp[7]=(byte)(0xFF&(data>>56));
return temp;
}

将float类型数据转换为字节流

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public static byte[] getByteFromFloat(float data){
byte[] temp=new byte[4];
int tempInt=Float.floatToIntBits(data);
temp[0]=(byte)(0xFF&(tempInt));
temp[1]=(byte)(0xFF&(tempInt>>8));
temp[2]=(byte)(0xFF&(tempInt>>16));
temp[3]=(byte)(0xFF&(tempInt>>24));
return temp;
}

将double类型数据转换为字节流

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public static byte[] getByteFromDouble(double data){
byte[] temp=new byte[8];
long tempLong=Double.doubleToLongBits(data);
temp[0]=(byte)(0xFF&(tempLong));
temp[1]=(byte)(0xFF&(tempLong>>8));
temp[2]=(byte)(0xFF&(tempLong>>16));
temp[3]=(byte)(0xFF&(tempLong>>24));
temp[4]=(byte)(0xFF&(tempLong>>32));
temp[5]=(byte)(0xFF&(tempLong>>40));
temp[6]=(byte)(0xFF&(tempLong>>48));
temp[7]=(byte)(0xFF&(tempLong>>56));
return temp;
}