在實(shí)際開發(fā)中，我們經(jīng)常遇到與嵌入式進(jìn)行通信的情況，而由于一些嵌入式設(shè)備的處理能力較差，往往以二進(jìn)制的數(shù)據(jù)流的形式傳輸數(shù)據(jù)，在此將這些常見的轉(zhuǎn)換做一總結(jié)。

注意：默認(rèn)傳輸時(shí)使用小端模式

將字節(jié)流轉(zhuǎn)換為int類型數(shù)據(jù)

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

將字節(jié)流轉(zhuǎn)換為long類型數(shù)據(jù)

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))); }

將字節(jié)流轉(zhuǎn)換為float類型數(shù)據(jù)

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

將字節(jié)流轉(zhuǎn)換為double類型數(shù)據(jù)

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

將int類型數(shù)據(jù)轉(zhuǎn)換為字節(jié)流

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; }

將long類型數(shù)據(jù)轉(zhuǎn)換為字節(jié)流

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; }

將float類型數(shù)據(jù)轉(zhuǎn)換為字節(jié)流

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; }

將double類型數(shù)據(jù)轉(zhuǎn)換為字節(jié)流

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; }