第一次通过docker部署java服务的全过程

src/
├── main/
│   ├── java/com/example/demo/
│   │   ├── controller/UserController.java
│   │   ├── mapper/UserMapper.java
│   │   ├── model/User.java
│   │   └── DockerDemoApplication.java
│   └── resources/
│       ├── application.yml
|       ├── application-dev.yml
|       ├── application-docker.yml
│       └── mybatis/mapper/UserMapper.xml
Dockerfile
docker-compose.yml
init.sql

# application.yml
server:
  port: 8080

spring:
  profiles:
    active: dev
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: 111
    username: 111
    password: 111

mybatis:
  mapper-locations: classpath:mybatis/mapper/*.xml
  configuration:
    map-underscore-to-camel-case: true
    
    
# application-dev.yml
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/testdb?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
    username: root
    password: 123456
    

# application-docker.yml
spring:
  datasource:
    url: ${SPRING_DATASOURCE_URL}
    username: ${SPRING_DATASOURCE_USERNAME}
    password: ${SPRING_DATASOURCE_PASSWORD}

FROM openjdk:8-jdk # 使用jdk8的镜像
WORKDIR /app # 设置容器的工作目录为app，可以随意命名
COPY target/*.jar app.jar # 将jar包拷贝到app目录之下
EXPOSE 8080 # 容器的服务端口为8080
CMD ["java", "-jar", "app.jar"] # 容器启动时执行的命令：运行Java应用

version: '3.8'

services:
  mysql:
    image: mysql:8.0 # docker的mysql版本
    container_name: mysql-container # 容器名称
    environment: # root账号信息，涉及的数据库
      MYSQL_ROOT_PASSWORD: 123456
      MYSQL_DATABASE: testdb
    ports: # 端口，前面为暴露到公网的端口（与主机公用），后面为docker内部占用的端口
      - "3306:3306"
    volumes:
      - mysql-data:/var/lib/mysql
    command: --default-authentication-plugin=mysql_native_password
    healthcheck:
      test: [ "CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-proot" ]
      interval: 5s
      timeout: 10s
      retries: 20

  app:
    build: .
    container_name: app-container
    depends_on: # 添加依赖关系
      mysql:
        condition: service_healthy
    ports:
      - "8080:8080"
    environment: # 环境变量，这里与application-docker.yml进行呼应，且需要与上面的mysql信息一致（登陆账号信息）
      SPRING_DATASOURCE_URL: jdbc:mysql://mysql:3306/testdb?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
      SPRING_DATASOURCE_USERNAME: root
      SPRING_DATASOURCE_PASSWORD: 123456
    links:
      - mysql

volumes:
  mysql-data: