在Docker容器中将Spring与MySql连接起来

当我按照这个教程： https ： //spring.io/guides/gs/accessing-data-mysql/#initial并旋转了一些新的docker集装箱：

version: '2' services: db: image: mysql environment: - MYSQL_DATABASE=test - MYSQL_USER=test - MYSQL_PASSWORD=secret - MYSQL_ROOT_PASSWORD=root volumes: - ./db:/var/lib/mysql ports: - "3306:3306" phpmyadmin: image: phpmyadmin/phpmyadmin environment: PMA_ARBITRARY: 1 MYSQL_USER: test MYSQL_PASSWORD: secret MYSQL_ROOT_PASSWORD: root ports: - "80:80" links: # for mysql container - "db:db" volumes: db: driver: "local" 

我无法连接到MySql数据库，当我在春运行示例应用程序时，我得到的错误：

 Unable to create initial connections of pool. com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 

我的应用程序属性

 spring.jpa.hibernate.ddl-auto=create spring.datasource.url=jdbc:mysql://db:3306/test spring.datasource.username=springuser spring.datasource.password=ThePassword 

出了什么问题？ 我也尝试像localhost不同的组合。 我可以在我的浏览器中访问phpmyadmin。