c3p0-config.xml的配置：
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.cj.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql:///shop?characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false</property>
<property name="user">root</property>
<property name="password">123456</property>
</default-config>
</c3p0-config>
jar包要用到
c3p0-0.9.5.2.jar和mchange-commons-java-0.2.12.jar 两个包要版本匹配，否则无法运行。（改bug改了仨小时的血泪教训）