c3p0的使用步骤

//1、导入c3p0的连个包，和mysql的驱动包//2、配置c3p0.xml的配置文件

<c3p0-config>  <!-- 使用默认的配置读取连接池对象 -->  <default-config>   <!--  连接参数 -->    <property name="driverClass">com.mysql.jdbc.Driver</property>    <property name="jdbcUrl">jdbc:mysql://localhost:3306/estore</property>    <property name="user">root</property>    <property name="password">123</property>        <!-- 连接池参数 -->    <property name="initialPoolSize">5</property>    <property name="maxPoolSize">10</property>    <property name="checkoutTimeout">3000</property>  </default-config>  <named-config name="otherc3p0">     <!--  连接参数 -->    <property name="driverClass">com.mysql.jdbc.Driver</property>    <property name="jdbcUrl">jdbc:mysql://localhost:3306/estore</property>    <property name="user">root</property>    <property name="password">123</property>        <!-- 连接池参数 -->    <property name="initialPoolSize">5</property>    <property name="maxPoolSize">8</property>    <property name="checkoutTimeout">1000</property>  </named-config></c3p0-config>//3、代码测试package cn.itcast.datasoure.c3p0;import com.mchange.v2.c3p0.ComboPooledDataSource;import javax.sql.DataSource;import java.sql.Connection;import java.sql.SQLException;/** * @author newcityman * @date 2019/8/16 - 21:45 */public class C3P0Demo01 {    public static void main(String[] args) {        Connection conn = null;        try {//        1、创建数据库连接池对象            DataSource ds = new ComboPooledDataSource();//        2、获取连接对象            conn= ds.getConnection();            System.out.println(conn);        } catch (SQLException e) {            e.printStackTrace();        }    }}

来源：https://www.cnblogs.com/newcityboy/p/11366808.html