For well-known reasons, maven's library is very slow in mainland China. Most of the articles I found on Baidu are directly added to ~ /. m2/setting.xml

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

In fact, with this setting, I found that the image has not changed. It is still the Central Library of maven. On maven's website http://maven.apache.org/settings.html， It is suggested that we set it like this

<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>Alibaba cloud public warehouse</name>
     <url>https://maven.aliyun.com/repository/public</url>
    </mirror>
     <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>Alibaba cloud Google warehouse</name>
     <url>https://maven.aliyun.com/repository/google</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>Alicloud Apache warehouse</name>
     <url>https://maven.aliyun.com/repository/apache-snapshots</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>Ali cloud spring Warehouse</name>
     <url>https://maven.aliyun.com/repository/spring</url>
    </mirror>
    <mirror>
     <id>aliyunmaven</id>
     <mirrorOf>*</mirrorOf>
     <name>Ali cloud spring Plug-in repository</name>
     <url>https://maven.aliyun.com/repository/spring-plugin</url>
    </mirror>
  </mirrors>
  <proxies/>
  <profiles/>
  <activeProfiles/>
</settings>

After this setting, I found that the maven library has indeed been changed to the Alibaba cloud library.