集群环境下uuid的生成
package com.example.demo; import lombok.extern.slf4j.Slf4j; import java.io.UnsupportedEncodingException; import java.util.UUID; import java.util.concurrent.atomic.AtomicInteger; @Slf4j public class UUIDUtil { /* 从运行环境的JAVA_OPTIONS中，获取配置：当前实例名 */ private static final String INSTANCE_NAME = System.getProperty("instance.name"); private static final AtomicInteger COUNT = new AtomicInteger(0); /** * 声明private构造方法 */ private UUIDUtil() { } /** * 生成分布式UUID * * @return */ public static String generateConcurrentUUID() { if (null == INSTANCE_NAME) { return "The instance.name JVM option is null"; } String result = null; StringBuilder builder = new StringBuilder(); builder.append(INSTANCE_NAME); builder.append(System.currentTimeMillis()); builder.append(COUNT.incrementAndGet()); result = builder.toString(); System.out.println(result); try { result = UUID.nameUUIDFromBytes(result.getBytes("UTF-8")).toString().replace("-", ""); } catch (UnsupportedEncodingException e) { log.error("uuid generate exception", e); } return result; } public static void main(String[] args){ System.out.println(generateConcurrentUUID()); } }