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();
        }
    }
}

原文地址：https://www.cnblogs.com/newcityboy/p/11366808.html