连接MySQL 报错"init datasource error, url: jdbc:mysql:/" 解决

原因

原来数据库5.5升级到8.0后，数据库连接配置没有改造成的

解决办法

1、驱动包要升级为 mysql-connector-java-8.0.11.jar 或更新的版本
https://dev.mysql.com/downloads/file/?id=477058

Maven 依赖:

<dependencies>
	<dependency>
    	<groupId>mysql</groupId>
    	<artifactId>mysql-connector-java</artifactId>
    	<version>8.0.11</version>
	</dependency>
</dependencies>	

2、JDBC driver 由com.mysql.jdbc.Driver改为com.mysql.cj.jdbc.Driver
3、url中加上“useSSL=false”。否则会出现以下错误：

“Establishing SSL connection withoutserver's identity verification is not recommended. According to MySQL 5.5.45+,5.6.26+ and 5.7.6+ requirements SSL connection must be established by defaultif explicit option isn't set. For compliance with existing applications notusing SSL the verifyServerCertificate property is set to 'false'. You needeither to explicitly disable SSL by setting useSSL=false, or set useSSL=trueand provide truststore for server certificate verification.”

4、url中加上“serverTimezone=GMT%2B8”（GMT%2B8代表东八区）否则会报关于时区的错

一个完整配置的例子:

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql:/localhost:3306/mysql?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=yourpassword

参考

连接数据库报错init datasource error, url: jdbc:mysql:/