JDBC驱动com.mysql.jdbc.Driver

1.JDBC连接Mysql5

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.37</version>
            <scope>runtime</scope>
        </dependency>

driver-class-name: com.mysql.jdbc.Driver

2.JDBC连接Mysql6

		<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
            <scope>runtime</scope>
        </dependency>

driver-class-name: com.mysql.cj.jdbc.Driver

提醒：不要小看一个cj.，这会直接导致是否连接数据库成功与否。