如果需要通过代理下载依赖及包装器，请在gradle.properties文件和gradle/wrapper/gradle-wrapper.properties文件中添加以下内容
如果需要全局设置这些属性，请将其添加到USER_HOME/.gradle/gradle.properties文件中
systemProp.proxySet=“true”
systemProp.http.keepAlive=“true”
systemProp.http.proxyHost=host
systemProp.http.proxyPort=port
systemProp.http.proxyUser=username
systemProp.http.proxyPassword=password
systemProp.http.nonProxyHosts=local.net|some.host.com
systemProp.https.keepAlive=“true”
systemProp.https.proxyHost=host
systemProp.https.proxyPort=port
systemProp.https.proxyUser=username
systemProp.https.proxyPassword=password
systemProp.https.nonProxyHosts=local.net|some.host.com