Maven - 多镜像节点配置

应用场景

在使用单镜像节点配置时，例如使用阿里云的官方单节点镜像

<mirror>
    <id>aliyunmaven</id>
    <mirrorOf>*</mirrorOf>
    <name>阿里云公共仓库</name>
    <url>https://maven.aliyun.com/repository/public</url>
</mirror>

此时，如果出现某些依赖包不存在阿里云的 central 仓和 jcenter 仓中（public 是 central 仓和 jcenter 仓的聚合仓），则会发生依赖处理错误，无法顺利打包

而阿里云其实代理了多个仓库，当某些依赖包不存在于 public 仓时，可以去其他的仓库寻找，找到后成功导入依赖，则可以顺利打包

例如 org.pentaho:pentaho-aggdesigner-algorithm:jar:5.1.5-jhyde，因为该依赖包位于 spring-plugin 仓库中，根本不存在中央仓库中，因此使用 public 仓库是无法下载的，需要配置阿里云的 spring-plugin 仓库镜像

多镜像节点配置

根据阿里云官方代理仓库表

仓库名称	代理源地址	使用地址
central	https://repo1.maven.org/maven2/	https://maven.aliyun.com/repository/central 或 https://maven.aliyun.com/nexus/content/repositories/central
jcenter	http://jcenter.bintray.com/	https://maven.aliyun.com/repository/jcenter 或 https://maven.aliyun.com/nexus/content/repositories/jcenter
public	central仓和jcenter仓的聚合仓	https://maven.aliyun.com/repository/public或https://maven.aliyun.com/nexus/content/groups/public
google	https://maven.google.com/	https://maven.aliyun.com/repository/google 或 https://maven.aliyun.com/nexus/content/repositories/google
gradle-plugin	https://plugins.gradle.org/m2/	https://maven.aliyun.com/repository/gradle-plugin 或 https://maven.aliyun.com/nexus/content/repositories/gradle-plugin
spring	http://repo.spring.io/libs-milestone/	https://maven.aliyun.com/repository/spring 或 https://maven.aliyun.com/nexus/content/repositories/spring
spring-plugin	http://repo.spring.io/plugins-release/	https://maven.aliyun.com/repository/spring-plugin 或 https://maven.aliyun.com/nexus/content/repositories/spring-plugin
grails-core	https://repo.grails.org/grails/core	https://maven.aliyun.com/repository/grails-core 或 https://maven.aliyun.com/nexus/content/repositories/grails-core
apache snapshots	https://repository.apache.org/snapshots/	https://maven.aliyun.com/repository/apache-snapshots 或 https://maven.aliyun.com/nexus/content/repositories/apache-snapshots

对应配置 central、jcenter、google、spring 和 spring-plugin

注意，在多镜像节点配置的过程中，不能使用 <mirrorOf>*</mirrorOf> 配置，否则会导致其他节点配置无效

<!-- central -->
<mirror>
    <id>aliyunmaven-central</id>
    <mirrorOf>central</mirrorOf>
    <name>central</name>
    <url>https://maven.aliyun.com/repository/public</url>
</mirror>
<!-- jcenter -->
<mirror>
    <id>aliyunmaven-jcenter</id>
    <mirrorOf>jcenter</mirrorOf>
    <name>jcenter</name>
    <url>https://maven.aliyun.com/repository/public</url>
</mirror>
<!-- google -->
<mirror>
    <id>aliyunmaven-google</id>
    <mirrorOf>google</mirrorOf>
    <name>google</name>
    <url>https://maven.aliyun.com/repository/google</url>
</mirror>
<!-- spring -->
<mirror>
    <id>aliyunmaven-spring</id>
    <mirrorOf>spring</mirrorOf>
    <name>spring</name>
    <url>https://maven.aliyun.com/repository/spring</url>
</mirror>
<!-- spring-plugin -->
<mirror>
    <id>aliyunmaven-spring-plugin</id>
    <mirrorOf>spring-plugin</mirrorOf>
    <name>spring-plugin</name>
    <url>https://maven.aliyun.com/repository/spring-plugin</url>
</mirror>

配置完镜像，保存重启 IDE，再次导入 maven 即可完成