maven引入包失敗：Cannot access nexus (http://maven.xxxx.com/content/groups/public/) in offline mode and

確認maven庫有該jar包卻下載不下來，報：Cannot access nexus (http://maven.xxxx.com/content/groups/public/) in offline mode and

解決：

IDEA去掉離線模式的對號，否則不會去聯網獲取jar包