maven 的多镜像次序生效问题

一、目标

让 maven 项目的镜像依次生效，达成 pom 依赖先去第一个镜像寻找依赖，如果找不到，再依次去后面的镜像寻找。

二、配置

1、步骤一

在 maven 的 settings.xml，去配置多镜像，如下面例子所示：

<mirrors>

     <mirror>
      <id>alimavenid>
      <name>aliyun mavenname>
      <url> https://maven.aliyun.com/repository/centralurl>
      <mirrorOf>centralmirrorOf>
    mirror>

    <mirror>
      <id>centralid>
      <name>Maven Repository Switchboardname>
      <url>https://repo1.maven.org/maven2/url>
      <mirrorOf>centralmirrorOf>
    mirror>

  <mirror>
    <id>aliyunmavenid>
    <name>阿里云spring插件仓库name>
    <url>https://maven.aliyun.com/repository/spring-pluginurl>
    <mirrorOf>centralmirrorOf>
  mirror>

  <mirror>
    <id>repo2id>
    <name>Mirror from Maven Repo2name>
    <url>https://repo.spring.io/plugins-release/url>
    <mirrorOf>centralmirrorOf>
  mirror>

  mirrors>
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该配置设置了 4 个镜像，但镜像生效，是当一个镜像完全不可用，才会依次执行下一个镜像。接着要进行下面配置。
注意：
配置多个mirror时，mirrorOf不能配置*。*的意思就是（根据mirrorOf和repository的id）匹配所有的库（repository），这样就是说如果你需要某个jar，他会从镜像地址去下载这个jar。不管你配置了多少个库，即使这些库的地址不一样，仍然会从镜像地址访问。

2、步骤二

<profiles>
	<profile>
	   <id>jdk-1.8id>
	   <activation>
	     <activeByDefault>trueactiveByDefault>
	     <jdk>1.8jdk>
	   activation>
	   <properties>
	     <maven.compiler.source>1.8maven.compiler.source>
	     <maven.compiler.target>1.8maven.compiler.target>
	     <maven.compiler.compilerVersion>1.8maven.compiler.compilerVersion>
	   properties>
	 profile>

	 <profile>
	     <id>nexusid>
	     <repositories>
	         <repository>
	             <id>centralid>
	             <url>https://repo1.maven.org/maven2/url>
	             <snapshots>
	                 <enabled>falseenabled>
	             snapshots>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	         repository>
	         <repository>
	             <id>alimavenid>
	             <url>https://maven.aliyun.com/repository/centralurl>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         repository>
	         <repository>
	             <id>aliyunmavenid>
	             <url>https://maven.aliyun.com/repository/spring-pluginurl>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         repository>
	         <repository>
	             <id>repo2id>
	             <url>https://repo.spring.io/plugins-release/url>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         repository>
	     repositories>
	     <pluginRepositories>
	         <pluginRepository>
	             <id>centralid>
	             <url>https://repo1.maven.org/maven2/url>
	             <snapshots>
	                 <enabled>falseenabled>
	             snapshots>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	         pluginRepository>
	         <pluginRepository>
	             <id>alimavenid>
	             <url>https://maven.aliyun.com/repository/centralurl>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         pluginRepository>
	         <pluginRepository>
	             <id>aliyunmavenid>
	             <url>https://maven.aliyun.com/repository/spring-pluginurl>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         pluginRepository>
	         <pluginRepository>
	             <id>repo2id>
	             <url>https://repo.spring.io/plugins-release/url>
	             <releases>
	                 <enabled>trueenabled>
	             releases>
	             <snapshots>
	                 <enabled>trueenabled>
	             snapshots>
	         pluginRepository>
	     pluginRepositories>
	 profile>
profiles>
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3、步骤三

设置生效的 activeProfiles，指向上面 profile 的 id

<activeProfiles>
    <activeProfile>nexusactiveProfile>
activeProfiles>
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