问如何在Docker和PostgreSQL数据库中同时使用Java？

EN

version: '3'
services:
  db:
    image: 'postgres:13'
    # cf. https://devcenter.heroku.com/articles/heroku-postgresql#version-support
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: TestPhasePassword
      POSTGRES_DB: mydb
    # The following is UNNEEDED for the app service to access the db.
    # Enable it ONLY IF YOU NEED TO ALSO ACCESS THE DB FROM THE HOST.
    # ports:
    #   - '5432:5432'
    networks:
      - db-net
    # The volume is useful to locally test the webapp data persistence,
    # after running "docker-compose down && docker-compose up --build".
    volumes:
      - postgres-data-dev:/var/lib/postgresql/data
  app:
    build: .
    # image: name-of-your-app  # optional
    environment:
      DATABASE_URL: 'postgres://postgres:TestPhasePassword@db:5432/mydb'
    ports:
      - '8080:8080'
    networks:
      - db-net
    depends_on:
      - db
networks:
  db-net:
    driver: bridge
volumes:
  postgres-data-dev:
    driver: local