将MySQL连接到Spring启动：通信失败

我是docker compose的新手，希望将mysql连接到我的spring boot应用程序

我的撰写文件看起来

version: '3'

volumes:
   mysql_data:

services:
   ww-mysql:
      image: mysql:5.7
      volumes:
         - mysql_data:/var/lib/mysql
      ports:
         - 3306:3306
      environment:
         MYSQL_ROOT_PASSWORD: root
         MYSQL_DATABASE: ww
         MYSQL_USER: admin
         MYSQL_PASSWORD: admin

ww-app:
      build: .
      image: ww-app
      ports:
         - 8080:8080
      depends_on:
         - ww-mysql
      links:
         - ww-mysql

连接到mysql的应用程序属性

spring.datasource.url = jdbc:mysql://localhost:3306/ww?useSSL=false
spring.datasource.username = admin
spring.datasource.password = admin

# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

# Show or not log for each sql query
spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update

# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager)

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

我得到的错误

 2019-06-05 04:58:16.411 ERROR 6 --- [           main] org.hibernate.tool.hbm2ddl.SchemaUpdate  : HHH000319: Could not get database metadata
ww-app_1    | 
ww-app_1    | com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
ww-app_1    | 
ww-app_1    | The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

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我很困惑。我的mysql服务器运行在我的Ubuntu18上

我看不到你在那里放了一个驱动程序类名。 //--对于mysql 5 spring.datasource.driver类名=com.mysql.jdbc.driver

//--对于mysql 8

---

spring.datasource.driver class name=com.mysql.cj.jdbc.driver

将jdbc URL更改为

jdbc：mysql://ww-mysql:3306/ww?useSSL=false

---

出现此错误的原因是因为两者都在不同的容器中运行，您无法告诉Spring service在其容器中查找MySql连接。

您的撰写文件不完整可能重复