<!-- 读取db.properties文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置c3p0连接池 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
</bean>
db.properties内容
jdbc.driverClass=com.mysql.jdbc.Driver jdbc.user=root jdbc.password=password jdbc.jdbcUrl=jdbc:mysql://localhost:3306/mybase?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=UTC
原文：https://www.cnblogs.com/longyang2018/p/10512841.html