如果重新导入不起作用(即在pom更新后没有删除旧版本的依赖项)，还有一个机会:

打开项目设置(CTRL+SHIFT+ALT+S) 在模块上，删除所有你想要重新导入的库(例如重复) IDEA会警告一些仍在使用，确认 应用并选择OK 然后重新导入所有的maven项目。

有两种方法可以做到。

1号路

进入文件>设置>构建，执行，部署>构建工具| Maven

选择“始终更新快照”

Apply和OK

2号路 mvn -U clean install

执行此命令 mvn -U clean install

按Ctrl+Shift+A找到动作，输入“reload”，会找到“reload All Maven Projects”。

在Mac上，使用⌘+ + a。

进入文件|设置|构建，执行，部署|构建工具| Maven

选择“始终更新快照”

这在2022年仍然是一个问题。

The option Setting > Maven > Always update snapshots no longer works in IDEA 2022.2.2, probably because Maven 3 frowns upon it and IntelliJ seems to not have updated the IDE to make it function. A simple solution might be to be able to add maven -U clean install as a custom target to the Lifecycle list in the IDEA Maven tab, but if it is possible it is not clear how to do it (even after googling for days). A not as nice but viable solution would be to go into the Terminal tool of IDEA and typing maven -U clean install, but IDEA does not expose the maven command in its Terminal by default and again it is not clear how to configure it so that it would.