之前一致可以正常使用，然后突然无法引入新的包

无法引包

org.apache.flink:flink-streaming-java_2.12:pom:1.13.1 failed to transfer from http://maven.aliyun.com/nexus/content/groups/public during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.flink:flink-streaming-java_2.12:pom:1.13.1 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): maven.aliyun.com

解决办法

查找阿里云新的maven下载地址发现旧的地址变了
使用新地址

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

    <mirror>
      <id>aliyunmaven</id>
      <mirrorOf>*</mirrorOf>
      <name>阿里云公共仓库</name>
      <url>https://maven.aliyun.com/repository/public</url>
    </mirror>