将maven源改为国内阿里云镜像

由于众所周知的原因，maven的库在*非常慢。我在百度上搜到的大部分文章都是直接在~/.m2/settings.xml 加入以下内容

  <mirrors>
    <mirror>
    <id>aliyunmaven</id>
    <mirrorOf>central</mirrorOf>
    <name>aliyun maven</name>
    <url>https://maven.aliyun.com/repository/public </url>
    </mirror>
  </mirrors>

其实这样设置，我发现其实镜像并没有改变，还是maven的*库。在maven 库的官网上http://maven.apache.org/settings.html，是建议我们这样设置的

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <localRepository/>
  <interactiveMode/>
  <usePluginRegistry/>
  <offline/>
  <pluginGroups/>
  <servers/>
  <mirrors>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>阿里云公共仓库</name>
     <url>https://maven.aliyun.com/repository/public</url>
    </mirror>
     <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>阿里云谷歌仓库</name>
     <url>https://maven.aliyun.com/repository/google</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>阿里云阿帕奇仓库</name>
     <url>https://maven.aliyun.com/repository/apache-snapshots</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>阿里云spring仓库</name>
     <url>https://maven.aliyun.com/repository/spring</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>阿里云spring插件仓库</name>
     <url>https://maven.aliyun.com/repository/spring-plugin</url>
    </mirror>
  </mirrors>
  <proxies/>
  <profiles/>
  <activeProfiles/>
</settings>

这样设置之后，我发现maven库确实改成了阿里云库。