是因为IDEA注册码的问题，
解决方案：
修改此路径的hosts文件：C:\Windows\System32\drivers\etc\hosts
在其最后一行加入：“0.0.0.0 account.jetbrains.com”
保存即可。然后退出IDEA,重新获取注册码打开就好了。
ItelliJ IDEA下载及获取注册码详解
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