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参考了网上的一些教程：
1.找到安装maven的路径
2.直接搜索settings.xml文件
3.我反正是找到两个这样的文件，一个在maven2目录下一个在maven3目录下，我把两个文件的内容都改成如下：
找到
然后把下面代码直接copy替换就好了
<mirrors><!-- mirror| Specifies a repository mirror site to use instead of a given repository. The repository that| this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used| for inheritance and direct lookup purposes, and must be unique across the set of mirrors.|<mirror><id>mirrorId</id><mirrorOf>repositoryId</mirrorOf><name>Human Readable Name for this Mirror.</name><url>/repo/path</url></mirror>--><!-- <mirror> --><!-- <id>repo2</id> --><!-- <mirrorOf>central</mirrorOf> --><!-- <name>Human Readable Name for this Mirror.</name> --><!-- <url>/maven2/</url> --><!-- </mirror> --><mirror><!--This sends everything else to /public --><id>nexus</id><mirrorOf>*</mirrorOf> <url>/nexus/content/groups/public/</url></mirror><mirror><!--This is used to direct the public snapshots repo in the profile below over to a different nexus group --><id>nexus-public-snapshots</id><mirrorOf>public-snapshots</mirrorOf> <url>/nexus/content/repositories/snapshots/</url></mirror></mirrors>
也就是换成了阿里的源，不知道你们怎么样。我反正是秒下
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