将double转换为byte []数组

问题描述：

如何在Java中转换双字节数组？我看了很多帖子，但是找不到正确的方法。

How can I convert double to byte array in Java? I looked at many other posts, but couldn't figure out the right way.

Input = 65.43 
byte[] size = 6
precision = 2   (this might change based on input)

expected output (byte[]) = 006543

不使用doubleToLongBits（）等功能吗？

Can I do it without using functions like doubleToLongBits()?

答

真实 double to byte [] 转换

Real double to byte[] Conversion

double d = 65.43;
byte[] output = new byte[8];
long lng = Double.doubleToLongBits(d);
for(int i = 0; i < 8; i++) output[i] = (byte)((lng >> ((7 - i) * 8)) & 0xff);
//output in hex would be 40,50,5b,85,1e,b8,51,ec

double to BCD Conversion

double d = 65.43;
byte[b] output = new byte[OUTPUT_LENGTH];
String inputString = Double.toString(d);
inputString = inputString.substring(0, inputString.indexOf(".") + PRECISION);
inputString = inputString.replaceAll(".", "");
if(inputString.length() > OUTPUT_LENGTH) throw new DoubleValueTooLongException();
for(int i = inputString.length() - 1; i >= 0; i--) output[i] = (byte)inputString.charAt(i)
//output in decimal would be 0,0,0,0,6,5,4,3 for PRECISION=2, OUTPUT_LENGTH=8

将double转换为byte []数组

相关推荐