idea 打开一个新的项目，maven都需要重新配置（设置默认全局设置）
File->Other Settings -> settings for new project
也可以设置默认jdk
File->Other Settings -> structure for new project 默认jdk
File->Other Settings -> settings for new project
也可以设置默认jdk
File->Other Settings -> structure for new project 默认jdk