pom文件頭報錯
1.導入maven文件，經常遇到表頭出錯問題。報錯：Failure to transfer org.apache.maven.shared:maven-filtering:pom:1.0-beta-2 from https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will
not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.shared:maven-
filtering:pom:1.0-beta-2 from/to central (https://repo.maven.apache.org/maven2): The operation was cancelled.
其大致原因是org.apache.maven.shared:maven-filtering:pom已經存在了，而且不能被強制更新了。
怎么將其更新呢？
首先根據org.apache.maven.shared:maven-filtering:pom:1.0-beta-2這個目錄在本地倉庫中刪除對應文件夾下的.lastUpdated后綴名的文件。
從新更新maven工程，就行了。
https://blog.csdn.net/qy20115549/article/details/52890026
--------------maven手動導入maven：https://blog.csdn.net/hueason/article/details/73676667