简介Spring 有五个事务隔离级别：ISOLATION_DEFAULT、ISOLATION_READ_UNCOMMITTED、ISOLATION_READ_COMMITTED、ISOLATION_REPEATABLE_READ、ISOLA

小情话第六百一十八则

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前置信息Maven 版本 apache-maven-3.5.2 Nexus 信息 nexus2、nexus3 镜像仓库 如果仓库 X 可以提供仓库 Y 存储的所有的内容，那么仓库 X 就可以说是 仓库 Y 的镜像(也就是说能从仓库

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