uuid生成

public class ENTITYIDGenerator {
private static UUIDGenerator generator = null;

static {
if (generator == null) {
synchronized(ENTITYIDGenerator.class) {
generator = UUIDGenerator.getInstance();
}
}
}

public static UUID getUUID() {
return generator.generateTimeBasedUUID();
}

public static String getEnityID() {
String uuid = generator.generateTimeBasedUUID().toString();
uuid = uuid.replaceAll("-", "");
return uuid.toString();
}

}