英文:
Converting a []byte array (java double encoded) to Float64
问题
所以，我正在尝试将一个字节数组解码为Float64。我尝试了很多不同的方法，都是在StackOverflow上找到的，但是到目前为止都没有成功！这是我尝试的Go Playground链接。预期值应该是3177408.5。原始值是一个Java double，编码为IEEE 754浮点数。
编辑：
该值是使用org.apache.hadoop.hbase.util.Bytes.toBytes方法进行编码的。
double v = 3445713.95;
long ff;
ff = Double.doubleToRawLongBits(v);
bArr = toBytes(ff)
public static byte[] toBytes(long val) {
byte[] b = new byte[8];
for(int i = 7; i > 0; --i) {
b[i] = (byte)((int)val);
val >>>= 8;
}
b[0] = (byte)((int)val);
return b;
}
实际上应该是：3445713.95
编辑2：
我的错误是没有仔细思考就直接粘贴了我得到的代码，Java并不是我擅长的。事实证明，在整个流程中（多个系统之间的通信）存在问题，导致值被破坏。我将把@Ainar-G的解决方案标记为正确，因为它实际上返回了接近预期值的结果。
英文:
So, I'm trying to decode a byte array to Float64. I've tried a bunch of different ways, found all over StackOverflow, but no luck so far! Here's the go playground link to what I have tried.
The expected value should be 3177408.5. The original value is a Java double, encoded as IEEE 754 floating-point
Edit:
The value is encoded using the org.apache.hadoop.hbase.util.Bytes.toBytes method.
double v = 3445713.95;
long ff;
ff = Double.doubleToRawLongBits(v);
bArr = toBytes(ff)
public static byte[] toBytes(long val) {
byte[] b = new byte[8];
for(int i = 7; i > 0; --i) {
b[i] = (byte)((int)val);
val >>>= 8;
}
b[0] = (byte)((int)val);
return b;
}
And actually should be: 3445713.95
Edit2:
My bad for actually just pasting code I was given, without thinking much first, Java is not exactly my cup of tea. Turns out there is a problem somewhere along the pipeline (multiple systems communicating), and value is getting corrupted. I'll mark @Ainar-G's solution as correct, since it actually gives back something close to the expected.
答案1
得分: 2
我能找到的最接近的方法是使用binary.BigEndian.Uint64：
b := []byte("AJ\x02\xef\xe1\xaf(l")
u := binary.BigEndian.Uint64(b)
f := math.Float64frombits(u)
fmt.Printf("%f", f)
这将给出结果3409375.763158。请确保在Java端正确编码你的浮点数。
Playground: https://play.golang.org/p/4KGZoWjLTF.
英文:
The closest I can get is if I use binary.BigEndian.Uint64:
b := []byte("AJ\x02\xef\xe1\xaf(l")
u := binary.BigEndian.Uint64(b)
f := math.Float64frombits(u)
fmt.Printf("%f", f)
This gives me 3409375.763158. Make sure you're encoding your float correctly on the Java side.
Playground: https://play.golang.org/p/4KGZoWjLTF.
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