需求:
集群环境下需要产生uuid,uuid的作用不言而喻
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环境:
<dependency> <groupId>org.safehaus.jug</groupId> <artifactId>jug</artifactId> <version>2.0.0</version> <classifier>asl</classifier> </dependency>
或:
<dependency> <groupId>org.safehaus.jug</groupId> <artifactId>jug</artifactId> <version>2.0.0</version> <classifier>lgpl</classifier> </dependency>
两个的区分只是license不一样
基于JUG实现:
UUIDGenerator generator=UUIDGenerator.getInstance(); UUID uuid=generator.generateRandomBasedUUID(); System.out.println(uuid.toString()); uuid=generator.generateTimeBasedUUID(); System.out.println(uuid.toString());
基于JDK的实现:
String uuidStr=java.util.UUID.randomUUID().toString(); System.out.println(uuidStr);
PS:
两种方式我单机测试jdk的性能高不知道各位看官有什么看法,测试如下:
public static void cost() throws Exception { UUIDGenerator generator=UUIDGenerator.getInstance(); final int size=10000000; long now=System.currentTimeMillis(); for (int i = 0; i < size; i++) { UUID uuid=generator.generateRandomBasedUUID(); String uidStr=(uuid.toString()); } long time1=System.currentTimeMillis(); for (int i = 0; i < size; i++) { String uidStr=java.util.UUID.randomUUID().toString(); } long end=System.currentTimeMillis(); System.out.println("jug cost:"+(time1-now)); System.out.println("jdk cost:"+(end-time1)); }
结果:
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jug cost:11209 jdk cost:10114