자바 웹 에서 데이터베이스 연결 탱크 proxool 설정 을 사용 합 니 다.

<?xml version="1.0" encoding="UTF-8"?>
<!--
the proxool configuration can be embedded within your own application's. Anything outside the "proxool" 

tag is ignored.
-->
<something-else-entirely>
     <proxool>
                <alias>smms</alias> <!--      -->
                <driver-url>jdbc:mysql://127.0.0.1:3306/smms</driver-url><!--url   -->
                <driver-class>com.mysql.jdbc.Driver</driver-class><!--   -->
                <driver-properties>
                        <property name="user" value="root" /><!--   -->
                        <property name="password" value="root" /><!--  -->
                </driver-properties>         
                <!--     (   5 ),        ,     ,        ,         

maximum-new-connections  -->
                <maximum-connection-count>100</maximum-connection-count>
                <!--     (  2 )-->
                <minimum-connection-count>10</minimum-connection-count>
                <!--proxool               (  ),             ,        

 30 -->
                <house-keeping-sleep-time>90000</house-keeping-sleep-time>
                <!--                       ,                  -

->
                <maximum-new-connections>10</maximum-new-connections>
                <!--          (  2 )-->
                <prototype-count>5</prototype-count>
                <!--       -->
                <test-before-use>true</test-before-use>
                <!--             -->
                <house-keeping-test-sql>select id from t_sysadmin</house-keeping-test-sql>
     </proxool>
</something-else-entirely>

  <servlet>     
   <servlet-name>ServletConfigurator</servlet-name>     
   <servlet-class>     
     org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>     
   <init-param>     
     <param-name>xmlFile</param-name>     
     <param-value>WEB-INF/proxool.xml</param-value>     
   </init-param>     
   <load-on-startup>1</load-on-startup>     
</servlet>

package cn.edu.hbcit.smms.dao.databasedao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.log4j.Logger;

import org.logicalcobwebs.proxool.ProxoolException;       
import org.logicalcobwebs.proxool.ProxoolFacade;       
import org.logicalcobwebs.proxool.admin.SnapshotIF;
/**
 *       
 * @author lw
 *
 */
public class DBConn {
	private static Connection conn;
	private static ResultSet rs;
	private static PreparedStatement ps;
	private static String driverClass = "org.logicalcobwebs.proxool.ProxoolDriver";//proxool   
	//private static String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=123";
	private static int activeCount = 0; //     
	protected final Logger log = Logger.getLogger(DBConn.class.getName());
	
    /**
     *        
     * @return Connection
     */
	public Connection getConn() {
		try {
			Class.forName(driverClass); 
			conn = DriverManager.getConnection("proxool.smms"); //   smms  proxool.xml         
			this.showSnapshotInfo(); //       
		} catch (Exception e) {
			log.error(e.getMessage());
			log.debug("       ！");
			//System.out.println(e.getMessage());
			//System.out.println("       ！");
		}
		return conn;
	}
	
	/**     
     *          
     * freeConnection     
     * @param conn     
     */
	public void freeConnection(Connection conn){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
	

	/**
	 *            
	 */
	private void showSnapshotInfo(){
        try{       
            SnapshotIF snapshot = ProxoolFacade.getSnapshot("smms", true);       
            int curActiveCount=snapshot.getActiveConnectionCount();//              
            int availableCount=snapshot.getAvailableConnectionCount();//                
            int maxCount=snapshot.getMaximumConnectionCount() ;//             
            if(curActiveCount!=activeCount)//                     
            {
            	log.debug("     :"+curActiveCount+"(active)；       :"+availableCount+"(available)；    :"+maxCount+"(max)");
             //System.out.println("     :"+curActiveCount+"(active)；       :"+availableCount+"(available)；    :"+maxCount+"(max)");                    
             activeCount=curActiveCount;       
            }
        }catch(ProxoolException e){       
            e.printStackTrace();       
        }       
    }  

}