Build a spring boot app image

1. In the directory where Dockerfile is located, unzip the jar package generated by MAVEN unzip<path-to-app-jar>.jar-d app2, Dockerfile we divide the content of the application into 4 parts copy into the Mirror: the first 3 are basically unchanged, the fourth one is the own code that changes frequently. The last line is the way to start the Spring boot app after decompression. From OpenJDK:8-jre-Alpinelabel Maintainer"[email protected]"COPY App/boot-inf/lib//app/boot-inf/lib/COPY App/org/app/orgcopy App/meta-inf/app/meta-infcopy App/boot-inf/classes/app/boot-inf/Classesexpose8080CMD ["/usr/bin/java","-CP","/app","Org.springframework.boot.loader.JarLauncher"]

Build a spring boot app image