maven 阿里云镜像仓库

 <mirrors>
 <mirror>  
    <id>nexus-aliyun</id>  
    <mirrorOf>central</mirrorOf>    
    <name>Nexus aliyun</name>  
    <url>http://maven.aliyun.com/nexus/content/groups/public</url>  
</mirror>
</mirrors>

maven 官方搜索地址

https://mvnrepository.com/