maven 配置阿里云：pom中添加： <repositories>     <repository>         <id>aliyunmaven</id>         <url>http://maven.aliyun.com/nexus/content/groups/public/</url>     </repository> </repositories>       <repositories>         <repository>             <id>aliyun-repo</id>             <url>http://maven.aliyun.com/nexus/content/groups/public</url>         </repository>     </repositories>