jakarta ee如何在java ee中创建GUID

Question

我想知道如何在JavaEE中创建GUID号，我正在使用jboss 4.2.3

Answer 1

import java.util.UUID;

...
UUID id = UUID.randomUUID();

当标识符仅在数据库中使用时，它们的生成应该留给数据库本身See Statement.getGeneratedKeys

UUID Javadoc

Answer 2

要在Java中生成UUID，可以使用java.util.UUID类。这个类是在JDK 1.5中引入的

import java.util.UUID;

UUID uuid = UUID.randomUUID();
String randomUUIDString = uuid.toString();
System.out.println("Random UUID String = " + randomUUIDString);
System.out.println("UUID version       = " + uuid.version());
System.out.println("UUID variant       = " + uuid.variant());

Answer 3

import java.util.UUID;

UUID uuid = UUID.randomUUID();

String randomUUIDString = uuid.toString();