#Uuid generator java code

Let’s see the code snippet below: package We can also get the version and the variant of the UUID using the version() method and variant() method respectively. To obtain the value of the random string generated we need to call the UUID.toString() method. The UUID.randomUUID() method return a UUID object. To generate UUID in Java we can use the class. Some of its usage are for creating random file names, session id in web application, transaction id and for record’s primary keys in database replacing the sequence or auto generated number. In that case, JUG in the time-based mode is a good choice.UUID / GUID (Universally / Globally Unique Identifier) is frequently use in programming. If security is of ultimate importance to you, it cannot be used. If you need speed and/or support for EJBs or CORBA, UUID is the best way.

#Uuid generator java mac

Security aspects must be considered when version 1 UUIDs that contain the MAC address are made public. My own version does this without native code (tested on Windows, Linux, MacOSX, BSDs, Solaris, HP-UX) and falls back to random data if the MAC address cannot be read.

#Uuid generator java windows

Because there is no official way in Java to do this, JUG comes with a native library (compiled for Windows x86, FreeBSD, Linux x86, MacOSX PPC, SPARC). The computer’s MAC address must be encoded into a version 1 UUID. It might not be possible to use some implementations in environments like EJB containers. Some of the implementations are slower than others. The goodĪll of the implementations I tested generated unique UUIDs, even when used multi-threaded. With a modern computer, it is possible to generate more than 500.000 UUIDs per second. My own implementation is the fastest by a factor of at least two. The following table contains the timings in milliseconds for the creation of one million UUIDs with the various implementations. The following Java Virtual Machines were used:Īll Java Virtual Machines were started with -Xms256M -Xmx256M to force a fixed VM size. Load on the computer was low during the tests. The test computer was an Intel Pentium M 1.73 GHz computer with 1.5 GB of RAM. The performance of all generators was compared. ++: very good, +: good, o: acceptable, -: bad, -: very bad Usually, this is done from, although JUG also supports parsing from byte arrays. Parse: Whether parsing UUIDs is supported.CORBA: Whether the generated UUIDs can be used in CORBA.EJB: Whether the generated UUIDs can be used as primary keys in enterprise java beans.

Speed: The performance of generating UUIDs.Versions: The UUID versions supported (1–5).Ease of use: How many lines of code does it take to get a UUID?.Commons Id – there is no release as of now.I did not compare the following packages: Quickly generate UUID/GUID online, using version 4 random number algorithm. Generally, whenever unique values across different machines are needed, UUIDs are a good choice. Java answers related to check if string is uuid java uuid from string. Primary keys, replacing database sequences.Unique identifiers for website visitors.In this entry, I will compare three generators of UUIDs written in the Java programming language. UUIDs (or GUIDs) are unique identifiers that are frequently used in programming.