FROM java:8
#此處的*為正則表達式，表示以.jar結(jié)尾的同步錄下的文件（這里的jar是maven打包好的）
COPY *.jar /app.jar

CMD ["--server.port=8080"]
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ARG DEPENDENCY=target/dependency # jar包解壓位置
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","com.example.MyApplication"]

# 指定基礎鏡像，這是分階段構(gòu)建的前期階段
FROM openjdk:8 as builder
# 執(zhí)行工作目錄
WORKDIR application
# 配置參數(shù)
ARG JAR_FILE=target/*.jar
# 將編譯構(gòu)建得到的jar文件復制到鏡像空間中
COPY ${JAR_FILE} application.jar
# 通過工具spring-boot-jarmode-layertools 從application.jar 中提取拆分后的構(gòu)建結(jié)果
RUN java -Djarmode=layertools -jar application.jar extract

# 正式構(gòu)建鏡像
FROM openjdk:8
WORKDIR application
# 前一階段從jar中提取除了多個文件，這里分別執(zhí)行COPY命令將他們復制到鏡像空間中，每次COPY都是一個layer
COPY --from=builder application/dependencies/ ./
COPY --from=builder application/spring-boot-loader/ ./
COPY --from=builder application/snapshot-dependencies/ ./
COPY --from=builder application/application/ ./
ENTRYPOINT ["java","-Duser.timezone=GMT+8","org.springframework.boot.loader.JarLauncher"]

# '-t' 設置打包鏡像tag， '-f' 設置DockerFile文件， '.'選擇當前目錄
docker build -t test:1.0 -f .\DockerFile .