gradle下载不了包

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Caused by: org.gradle.internal.resolve.ArtifactNotFoundException: Could not find hamcrest-core.jar (org.hamcrest:hamcrest-core:1.3).
Searched in the following locations:
    http://xxx/repository/jcenter/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar
	at org.gradle.internal.resolve.result.DefaultBuildableArtifactResolveResult.notFound(DefaultBuildableArtifactResolveResult.java:27)
	at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository$LocateInCacheRepositoryAccess.resolveArtifactFromCache(CachingModuleComponentRepository.java:273)
	at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository$LocateInCacheRepositoryAccess.resolveArtifact(CachingModuleComponentRepository.java:257)
	at org.gradle.api.internal.artifacts.ivyservice.ivyresolve.BaseModuleComponentRepositoryAccess.resolveArtifact(BaseModuleComponentRepositoryAccess.java:64)

删掉或者重命名C:\Users\xx\.gradle
重启Android Studio

A problem occurred configuring project ':app'.
> Could not resolve all dependencies for configuration ':app:_debugUnitTestApkCo
py'.
   > Could not find junit:junit:4.12.
     Required by:
         project :app

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug
option to get more log output.

BUILD FAILED

Total time: 7 mins 38.635 secs

gradle用3.3的，需要修改用2.3.3的插件，buildscript的classpath 用这个com.android.tools.build:gradle:2.3.3'





用了nexus的，看看是否设置了代理导致下不了内网的包
删掉gradle.properties文件的systemProp.http.proxyHost和systemProp.http.proxyPort