Analysis of example code on how to convert byte streams and basic data types in Java-javaTutorial-php.cn

Analysis of example code on how to convert byte streams and basic data types in Java

黄舟

Release： 2017-06-18 10:03:42

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This article mainly introduces examples of conversion between Java byte streams and basic data types. It has certain reference value. Interested friends can refer to it

In actual development, we often encounter the situation of communicating with embedded devices. Due to the poor processing capabilities of some embedded devices, data is often transmitted in the form of binary data streams. Here, these common Make a summary of the conversion.

Note: By default, little endian mode is used for transmission

Convert the byte stream into int type data

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

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Convert Convert byte stream to long type data

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)));
}

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Convert byte stream to float type data

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

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Convert byte stream to double type data

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

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Convert int type data to byte stream

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;
}

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Convert long type data to byte stream

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;
}

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Convert float type data to byte stream

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;
}

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Convert double type data to byte stream

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;
}

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