maven-surefire-plugin:jar:2.12.4 has not been downloaded from it before.

修改  maven-->conf :settings.xml

 

<offline>false</offline>

 

<mirror>
<id>mirrorId</id>
<mirrorOf>repositoryId</mirrorOf>
<name>Human Readable Name for this Mirror.</name>
<url>http://mvnrepository.com/</url>
</mirror>