IDEA安装后会默认将C:\Users\用户\AppData\Local\JetBrains\IntelliJIdea*作为系统目录，将C:\Users\用户\AppData\Roaming\JetBrains\IntelliJIdea*作为配置目录。在使用IDEA的过程中，这两个目录会不断占用C盘更多空间，所以可以重新指定非C盘的目录为系统目录和配置目录以避免这个问题，步骤如下：
- 创建自定义的系统目录
D:\workspace\IDEA\system和配置目录D:\workspace\IDEA\config - 在
IDEA安装目录\bin\idea.properties配置如下内容：
#---------------------------------------------------------------------
# Uncomment this option if you want to customize a path to the settings directory.
#---------------------------------------------------------------------
# idea.config.path=${user.home}/.IntelliJIdea/config
idea.config.path=D:/workspace/IDEA/config
#---------------------------------------------------------------------
# Uncomment this option if you want to customize a path to the caches directory.
#---------------------------------------------------------------------
# idea.system.path=${user.home}/.IntelliJIdea/system
idea.system.path=D:/workspace/IDEA/system
#---------------------------------------------------------------------
# Uncomment this option if you want to customize a path to the user-installed plugins directory.
#---------------------------------------------------------------------
# idea.plugins.path=${idea.config.path}/plugins
idea.plugins.path=D:/workspace/IDEA/config/plugins
#---------------------------------------------------------------------
# Uncomment this option if you want to customize a path to the logs directory.
#---------------------------------------------------------------------
# idea.log.path=${idea.system.path}/log
idea.log.path=D:/workspace/IDEA/system/log
- 将默认目录的内容复制到自定义的目录中
- 重新启动IDEA即可
