idea时间用长了，默认放在C盘的缓存就慢慢变大，需要修改一下缓存的默认位置。
修改步骤如下：
1.打开程序安装路径：D:\Program Files\IntelliJ IDEA 2017.2\bin，找到 idea.properties
2.用notepad++打开idea.properties文件，找到配置信息中有${user.home}的字段，如idea.config.path，idea.system.path，
例如，修改为：D:/JetBrains/
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE config folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
# idea.config.path=${user.home}/.IntelliJIdea/config
idea.config.path=D:/JetBrains/.IntelliJIdea2017/config
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE system folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
# idea.system.path=${user.home}/.IntelliJIdea/system
idea.system.path=D:/JetBrains/.IntelliJIdea2017/system
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to user installed plugins folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.plugins.path=${idea.config.path}/plugins
#---------------------------------------------------------------------
# Uncomment this option if you want to customize path to IDE logs folder. Make sure you're using forward slashes.
#---------------------------------------------------------------------
idea.log.path=${idea.system.path}/log
3.建议打开plugins和log的配置，去掉前面的#，这样会将插件和日志也切换到新目录下。
4.重新打开idea，会自动提示是否导入配置，如图，选择原始C盘的逻辑，会自动导入原始的配置和插件。
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