• 乱码的话：设置 File Encodings的Transparent native-to-ascii conversion为true
• 具体步骤如下：依次点击

File -> Settings -> Editor -> File Encodings

将Properties Files (*.properties)下的Default encoding for properties files设置为UTF-8，将Transparent native-to-ascii conversion前的勾选上。

• 还不行的话可以加上一下配置：

  banner.charset=UTF-8
  server.tomcat.uri-encoding=UTF-8
  spring.http.encoding.charset=UTF-8
  spring.http.encoding.enabled=true
  spring.http.encoding.force=true
  spring.messages.encoding=UTF-8