镜像下载地址我换过很多个，也没用。还有，我在学校的时候都有用，回到家就下载不了。
解决一天了快，很多网上的解决方法都试过了，还是没用。
不同的镜像文件，总的两种报错：
1.Could not transfer artifact org.springframework:spring-context:pom:5.1.7.RELEASE from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
2.Return code 501,ReasonPharse:HTTS Required.
解决一天了快，很多网上的解决方法都试过了，还是没用。
不同的镜像文件，总的两种报错：
1.Could not transfer artifact org.springframework:spring-context:pom:5.1.7.RELEASE from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
2.Return code 501,ReasonPharse:HTTS Required.
