使用C3P0和DBUtils

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
  <default-config>
    <property name="driverClass">com.mysql.jdbc.Driver</property>
    <property name="jdbcUrl">jdbc:mysql:///表名?useSSL=true</property>
    <property name="user">用户名</property>
    <property name="password">密码</property>
    <property name="initialPoolSize">5</property>
    <property name="maxPoolSize">20</property>
  </default-config> 
  <named-config name="oracle"> 
    <property name="driverClass">com.mysql.jdbc.Driver</property>
    <property name="jdbcUrl">jdbc:mysql:///表名?useSSL=true</property>
    <property name="user">用户名</property>
    <property name="password">密码</property>
  </named-config>  
</c3p0-config>

package C3P0Utils;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;
public class C3P0Utils {
    private static ComboPooledDataSource dataSource = new ComboPooledDataSource();

    public static DataSource getDataSource() {
        return dataSource;
    }

    public static Connection getConnection() {
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
}