wget https://services.gradle.org/distributions/gradle-4.1-all.zip
--2018-03-29 16:56:03-- https://services.gradle.org/distributions/gradle-4.1-all.zip
Resolving services.gradle.org (services.gradle.org)... 104.16.172.166, 104.16.175.166, 104.16.173.166, ...
--2018-03-29 16:56:03-- https://services.gradle.org/distributions/gradle-4.1-all.zip
Resolving services.gradle.org (services.gradle.org)... 104.16.172.166, 104.16.175.166, 104.16.173.166, ...
Connecting to services.gradle.org (services.gradle.org)|104.16.172.166|:443... failed: Connection timed out.
都是因为没有外网!!!