我执行以下操作来确定 Maven 考虑存储库顺序的顺序：
- 我将所有 XML 文件中所有存储库/镜像设置的 URL 更新为无效的 Maven 存储库，以强制 Maven 失败
- 我跑了
mvn compile
以下结果假设某个依赖项从未在本地缓存~/.m2/repository 中下载/注册（即它没有被缓存或之前没有使用其他存储库失败）。如果您在本地缓存中有某个依赖项的条目，Maven 将重用该缓存条目（它还保存初始源存储库）来尝试再次获取它。
这是 Maven 在没有配置镜像时尝试的：
Downloading from settings-repo1: http://settings-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-repo2: http://settings-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-child-repo1: http://child-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-child-repo2: http://child-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-parent-repo1: http://parent-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-parent-repo2: http://parent-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
当配置了镜像时：
Downloading from settings-repo1: http://settings-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-repo2: http://settings2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-mirror1: http://settings-mirror1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-mirror2: http://settings-mirror2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-parent-repo1: http://parent-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-parent-repo2: http://parent-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
所以顺序必须是：
settings.xml- 当前项目的
pom.xml
- 父项目的
pom.xml
如果配置了任何镜像，它们只会替换由mirrorOf 元素标识的原始列表中的相应存储库。如果mirrorOf 表达式标识了多个存储库，则仅尝试第一次出现（在没有配置镜像的 Maven 原始顺序中）。例如，如果有一个镜像（例如settings-mirror1）配置为：<mirrorOf>pom-parent-repo2,pom-child-repo1</mirrorOf>，则存储库搜索顺序将为：
Downloading from settings-repo1: http://settings-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-repo2: http://settings-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from settings-mirror1: http://settings-mirror1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-child-repo2: http://child-repo2.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from pom-parent-repo1: http://parent-repo1.org/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient1/4.5.6/httpclient1-4.5.6.pom
至于依赖POM文件中声明的存储库，我认为不应该关心它们。如果您有一个依赖项，这需要在声明的存储库之一（设置、父 pom、pom）中可用，否则构建将失败（即使您之前已由另一个项目下载并缓存了该依赖项（子依赖项与否） )。