1.下载

git clone -b 5.3.x https://gitee.com/mirrors/CAS.git

如果下载的是压缩包，导入工程会保存，因为builder.gradle的第20行开始有取git信息，如果是下载的zip会报错。如图：

2.gradle下载源改为阿里云，解决下载慢的问题

调整 CAS\gradle\wrapper\gradle-wrapper.properties文件内容

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
#distributionUrl=https\://services.gradle.org/distributions/gradle-4.8-bin.zip
distributionUrl=https\://mirrors.aliyun.com/macports/distfiles/gradle/gradle-4.8-bin.zip?spm=a2c6h.25603864.0.0.25cf260185Qb5V
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

3.解决保存

导入过程提示以下错误

A problem occurred configuring root project 'cas-server'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve io.spring.gradle:propdeps-plugin:0.0.10.RELEASE.
     Required by:
         project :
      > Could not resolve io.spring.gradle:propdeps-plugin:0.0.10.RELEASE.
         > Could not get resource 'https://jcenter.bintray.com/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
            > Could not HEAD 'https://jcenter.bintray.com/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
      > Could not resolve io.spring.gradle:propdeps-plugin:0.0.10.RELEASE.
         > Could not get resource 'https://maven.eveoh.nl/content/repositories/releases/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
            > Could not HEAD 'https://maven.eveoh.nl/content/repositories/releases/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
      > Could not resolve io.spring.gradle:propdeps-plugin:0.0.10.RELEASE.
         > Could not get resource 'https://plugins.gradle.org/m2/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
            > Could not HEAD 'https://plugins.gradle.org/m2/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
               > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
      > Could not resolve io.spring.gradle:propdeps-plugin:0.0.10.RELEASE.
         > Could not get resource 'https://repo.spring.io/plugins-release/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.
            > Could not HEAD 'https://repo.spring.io/plugins-release/io/spring/gradle/propdeps-plugin/0.0.10.RELEASE/propdeps-plugin-0.0.10.RELEASE.pom'.