Java生成UUID通用唯一识别码

Posted on feb. 2 2014

Java生成UUID通用唯一识别码 - Programming on the fly - BlogJava

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随笔-170 评论-150 文章-11 trackbacks-0 Java生成UUID通用唯一识别码UUID含义是通用唯一识别码 (Universally Unique Identifier)，这是一个软件建构的标准，也是被开源软件基金会 (Open Software Foundation, OSF) 的组织在分布式计算环境 (Distributed Computing Environment, DCE) 领域的一部份。UUID 的目的，是让分布式系统中的所有元素，都能有唯一的辨识资讯，而不需要透过中央控制端来做辨识资讯的指定。如此一来，每个人都可以建立不与其它人冲突的 UUID。在这样的情况下，就不需考虑数据库建立时的名称重复问题。目前最广泛应用的 UUID，即是微软的 Microsoft's Globally Unique Identifiers (GUIDs)，而其他重要的应用，则有 Linux ext2/ext3 档案系统、LUKS 加密分割区、GNOME、KDE、Mac OS X 等等。

以下是具体生成UUID的例子：

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package test;

import java.util.UUID;

public class UUIDGenerator {

public UUIDGenerator() {

}

public static String getUUID() {

UUID uuid = UUID.randomUUID();

String str = uuid.toString();

// 去掉"-"符号

String temp = str.substring(0, + str.substring(9, 13) + str.substring(14, 18) + str.substring(19, 23) + str.substring(24);

return str+","+temp;

}

//获得指定数量的UUID

public static String[] getUUID(int number) {

if (number < 1) {

return null;

}

String[] ss = new String[number];

for (int i = 0; i < number; i++) {

ss[i] = getUUID();

}

return ss;

}

public static void main(String[] args) {

String[] ss = getUUID(10);

for (int i = 0; i < ss.length; i++) {

System.out.println("ss["+i+"]====="+ss[i]);

}

package test;

import java.util.UUID;

public class UUIDGenerator {

public UUIDGenerator() {

}

public static String getUUID() {

UUID uuid = UUID.randomUUID();

String str = uuid.toString();

// 去掉"-"符号

String temp = str.substring(0, + str.substring(9, 13) + str.substring(14, 18) + str.substring(19, 23) + str.substring(24);

return str+","+temp;

} //获得指定数量的UUID

public static String[] getUUID(int number) {

if (number < 1) {

return null;

}

String[] ss = new String[number];

for (int i = 0; i < number; i++) {

ss[i] = getUUID();

}

return ss;

}

public static void main(String[] args) {

String[] ss = getUUID(10);

for (int i = 0; i < ss.length; i++) {

System.out.println("ss["+i+"]====="+ss[i]);

}

结果：

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ss[0]=====4cdbc040-657a-4847-b266-7e31d9e2c3d9,4cdbc040657a4847b2667e31d9e2c3d9

ss[1]=====72297c88-4260-4c05-9b05-d28bfb11d10b,72297c8842604c059b05d28bfb11d10b

ss[2]=====6d513b6a-69bd-4f79-b94c-d65fc841ea95,6d513b6a69bd4f79b94cd65fc841ea95

ss[3]=====d897a7d3-87a3-4e38-9e0b-71013a6dbe4c,d897a7d387a34e389e0b71013a6dbe4c

ss[4]=====5709f0ba-31e3-42bd-a28d-03485b257c94,5709f0ba31e342bda28d03485b257c94

ss[5]=====530fbb8c-eec9-48d1-ae1b-5f792daf09f3,530fbb8ceec948d1ae1b5f792daf09f3

ss[6]=====4bf07297-65b2-45ca-b905-6fc6f2f39158,4bf0729765b245cab9056fc6f2f39158

ss[7]=====6e5a0e85-b4a0-485f-be54-a758115317e1,6e5a0e85b4a0485fbe54a758115317e1

ss[8]=====245accec-3c12-4642-967f-e476cef558c4,245accec3c124642967fe476cef558c4

ss[9]=====ddd4b5a9-fecd-446c-bd78-63b70bb500a1,ddd4b5a9fecd446cbd7863b70bb500a1