spring boot 打包态，无需配置web root

display-server/src/main/resources/application.properties

is.spring.boot=true
web.root=src/main/webapp/
#web.root=c:/a/
spring.mvc.static-path-pattern=/**
spring.resources.static-locations=classpath:/static/,file:${web.root}
server.context-path=/display
#server.servlet-path=/display
spring.application.name=display
spring.application.index=display
#server.servlet-path=/display
logging.file=/home/aiosc/logs/display.log