将 ByteArray 转换为 UUID java
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Convert ByteArray to UUID java
提问by Android
Question is How do I convert ByteArray to GUID.
问题是如何将 ByteArray 转换为 GUID。
Previously I converted my guid to byte array, and after some transaction I need my guid back from byte array. How do I do that. Although irrelevant but conversion from Guid to byte[] is as below
以前我将我的 guid 转换为字节数组，在一些交易之后我需要从字节数组中取回我的 guid。我怎么做。虽然无关，但从 Guid 到 byte[] 的转换如下
public static byte[] getByteArrayFromGuid(String str)
{
UUID uuid = UUID.fromString(str);
ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
bb.putLong(uuid.getMostSignificantBits());
bb.putLong(uuid.getLeastSignificantBits());
return bb.array();
}
but how do I convert it back??
但我如何将其转换回来？
I tried this method but its not returning me same value
我试过这个方法，但它没有给我返回相同的值
public static String getGuidFromByteArray(byte[] bytes)
{
UUID uuid = UUID.nameUUIDFromBytes(bytes);
return uuid.toString();
}
Any help will be appreciated.
任何帮助将不胜感激。
采纳答案by Aaron Digulla
The method nameUUIDFromBytes()converts a name into a UUID. Internally, it applied hashing and some black magic to turn any name (i.e. a string) into a valid UUID.
该方法nameUUIDFromBytes()将名称转换为 UUID。在内部，它应用散列和一些黑魔法将任何名称（即字符串）转换为有效的 UUID。
You must use the new UUID(long, long);constructor instead:
您必须改用new UUID(long, long);构造函数：
public static String getGuidFromByteArray(byte[] bytes) {
ByteBuffer bb = ByteBuffer.wrap(bytes);
long high = bb.getLong();
long low = bb.getLong();
UUID uuid = new UUID(high, low);
return uuid.toString();
}
But since you don't need the UUID object, you can just do a hex dump:
但是因为你不需要 UUID 对象，你可以做一个十六进制转储：
public static String getGuidFromByteArray(byte[] bytes) {
StringBuilder buffer = new StringBuilder();
for(int i=0; i<bytes.length; i++) {
buffer.append(String.format("%02x", bytes[i]));
}
return buffer.toString();
}
回答by haraldK
Try:
尝试：
public static String getGuidFromByteArray(byte[] bytes) {
ByteBuffer bb = ByteBuffer.wrap(bytes);
UUID uuid = new UUID(bb.getLong(), bb.getLong());
return uuid.toString();
}
Your problem is that UUID.nameUUIDFromBytes(...)only creates type 3 UUIDs, but you want any UUID type.
您的问题是UUID.nameUUIDFromBytes(...)只创建类型 3 UUID，但您想要任何 UUID 类型。
回答by Brett Okken
Try doing same process in reverse:
尝试反向执行相同的过程：
public static String getGuidFromByteArray(byte[] bytes)
{
ByteBuffer bb = ByteBuffer.wrap(bytes);
UUID uuid = new UUID(bb.getLong(), bb.getLong());
return uuid.toString();
}
For both building and parsing your byte[], you really need to consider the byte order.
对于构建和解析您的 byte[]，您确实需要考虑字节顺序。
回答by fabiolimace
There's a method in UuidUtilfrom uuid-creatorthat does that.
还有一个方法，UuidUtil从uuid-creator那个做到这一点。
UUID uuid = UuidUtil.fromBytesToUuid(bytes);
Another method does the reverse.
另一种方法则相反。
byte[] bytes = UuidUtil.fromUuidToBytes(uuid);
