原因：
com/mysql/cj/jdbc/Driver是6.0版本的驅動，兼容JDK8環境，不兼容JDK7環境，在基於jdk7的tomcat中編譯運行會出錯，在基於jdk8的tomcat中編譯運行則不會出錯。
解決方案：
1、jdk7+老版5.0驅動com/mysql/jdbc/Driver
2、jdk8+新版6.0驅動com/mysql/cj/jdbc/Driver
java.lang.UnsupportedClassVersionError: com/mysql/cj/jdbc/Driver : Unsupported major.minor version 52.0 (unable to load class [com.mysql.cj.jdbc.Driver])
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