docker-compose 配置spring环境的方法步骤

#### 建立spring-boot项目
FROM openjdk:8-jdk-alpine as build

# 设置项目在docker容器中工作目录
WORKDIR /app

# 将 maven 可执行程序复制到容器中
COPY mvnw .
COPY .mvn .mvn

# 复制pom.xml文件
COPY pom.xml .

# 导入所有maven依赖
RUN ./mvnw dependency:go-offline -B

# 复制项目源代码
COPY src src

# 打包应用程序
RUN ./mvnw package -DskipTests
RUN mkdir -p target/dependency && (cd target/dependency; jar -xf ../*.jar)

#### 设置能运行应用程序的最小docker容器
FROM openjdk:8-jre-alpine

ARG DEPENDENCY=/app/target/dependency

# Copy project dependencies from the build stage
COPY --from=build ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY --from=build ${DEPENDENCY}/META-INF /app/META-INF
COPY --from=build ${DEPENDENCY}/BOOT-INF/classes /app

ENTRYPOINT ["java","-cp","app:app/lib/*","com.xiang.airTicket.AirTicketApplication"]

version: '3.7'

# 定义服务
services:
 # spring-boot服务
 app-server:
  build:
   context: . # 配置需要构建Dockerfile的路径 相对于docker-compose.yml
   dockerfile: Dockerfile
  ports:
   - "8080:8080" # 将本机8080端口映射到容器8080端口
  restart: always
  depends_on: 
   - db # 需要依赖的服务 率先构建
   - redis
  environment: # 设置环境变量
   SPRING_DATASOURCE_URL: jdbc:mysql://db:3306/airTicket?useSSL=false&serverTimezone=UTC&useLegacyDatetimeCode=false
   SPRING_DATASOURCE_USERNAME: root
   SPRING_DATASOURCE_PASSWORD: 123456
   SPRING_REDIS.HOST: redis
  networks: # 网络 连接mysql和redis
   - backend
 db:
  image: mysql:5.6
  ports:
   - "3306:3306"
  restart: always
  environment:
   MYSQL_DATABASE: airTicket
   MYSQL_USER: htx
   MYSQL_PASSWORD: 123456
   MYSQL_ROOT_PASSWORD: 123456
  volumes:
   - db-data:/var/lib/mysql
  networks:
   - backend
 redis:
  image: redis
  command: [ "redis-server", "--protected-mode", "no" ]
  hostname:
   redis
  ports:
   - "6379:6379"
  networks:
   - backend   
volumes:
 db-data:
networks:
 backend: