proxool试用

配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<something-else-entirely>
	<proxool>
		<alias>DBPool</alias>
		<driver-url>jdbc:mysql://127.0.0.1:3306/qianyu</driver-url>
		<driver-class>com.mysql.jdbc.Driver</driver-class>
		<driver-properties>
			<property name="user" value="root" />
			<property name="password" value="admin" />
			<property name="useUnicode" value="true" />
			<property name="characterEncoding" value="utf8" />
		</driver-properties>
		<!--自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回收,超时的销毁 -->
		<house-keeping-sleep-time>90000</house-keeping-sleep-time>
		<!--最少保持的空闲连接数 -->
		<prototype-count>5</prototype-count>
		<!--允许最大连接数,超过了这个连接，再有请求时，就排在队列中 -->
		<maximum-connection-count>1000</maximum-connection-count>
		<!--最小连接数 -->
		<minimum-connection-count>10</minimum-connection-count>
		<!--最大的等待请求数,即因没有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的 用户连接就不会被接受 -->
		<proxool.simultaneous-build-throttle>200</proxool.simultaneous-build-throttle>
		<!-- 自动重连的，也就是在网络错误或数据库重启等等原因导致与数据库断开，每次获取连接前都会检查，如果现在池子中的连接已经无效将会重新创建 -->
		<test-before-use>true</test-before-use>
		<!--Test SQL(SELECT getDate()) -->
		<house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
	</proxool>
</something-else-entirely>

web.xml中加入：

<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>  

<servlet>  
  <servlet-name>Admin</servlet-name>  
  <servlet-class>  
    org.logicalcobwebs.proxool.admin.servlet.AdminServlet  
  </servlet-class>  
</servlet>  
<servlet-mapping>  
  <servlet-name>Admin</servlet-name>  
  <url-pattern>/admin</url-pattern>  
</servlet-mapping>  
<!-- 配置受保护域，只有Tomcat管理员才能察看连接池的信息 -->  
<security-constraint>  
  <web-resource-collection>  
      <web-resource-name>proxool</web-resource-name>   
      <url-pattern>/admin</url-pattern>  
  </web-resource-collection>  
  <auth-constraint>  
     <role-name>manager</role-name>   
     </auth-constraint>  
  </security-constraint>  
 <login-config>  
     <auth-method>BASIC</auth-method>   
     <realm-name>proxool manager Application</realm-name>   
  </login-config>  
  <security-role>  
    <description>The role that is required to log in to the Manager Application</description>   
     <role-name>manager</role-name>   
 </security-role> 

java测试代码：

/**   
 * java (__FILE__, "$Revision: 1.1 $")
 *
 * @ A.java Create on 2014-3-26   
 *
 * Copyright (c) 2014 by [email protected]   
 */  
package com.dingding.dao;


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

import org.logicalcobwebs.proxool.ProxoolException;       
import org.logicalcobwebs.proxool.ProxoolFacade;       
import org.logicalcobwebs.proxool.admin.SnapshotIF;       

import com.pachira.utils.SrvLogger;


public class ProxoolPoolManager {       

    private static int activeCount = 0;       


    public ProxoolPoolManager(){       

    }          
    /**     
     * 获取连接     
     * getConnection     
     * @param name     
     * @return     
     */      
    public Connection getConnection() {       
        try{       
            Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");//proxool驱动类       
            Connection conn = DriverManager.getConnection("proxool.DBPool");    
           //此处的DBPool是在proxool.xml中配置的连接池别名      
            showSnapshotInfo();       

            return conn;       
        }catch(Exception ex){       
            ex.printStackTrace();       
        }       
        return null;       
    }       
    /**     
     * 此方法可以得到连接池的信息     
     * showSnapshotInfo     
     */      
    private void showSnapshotInfo(){       
        try{       
            SnapshotIF snapshot = ProxoolFacade.getSnapshot("DBPool", true);       
            int curActiveCount=snapshot.getActiveConnectionCount();//获得活动连接数       
            int availableCount=snapshot.getAvailableConnectionCount();//获得可得到的连接数       
            int maxCount=snapshot.getMaximumConnectionCount() ;//获得总连接数       
            if(curActiveCount!=activeCount)//当活动连接数变化时输出的信息       
            {       
             SrvLogger.debug(this.getClass(),"活动连接数:"+curActiveCount+"(active)  可得到的连接数:"+availableCount+"(available)  总连接数:"+maxCount+"(max)");                    
             activeCount=curActiveCount;       
            }       
        }catch(ProxoolException e){       
            SrvLogger.errorW(getClass(), "showSnapshotInfo error,",e);   
        }       
    }       
    /**     
     * 获取连接     
     * getConnection     
     * @param name     
     * @return     
     */      
    public Connection getConnection(String name){       
        return getConnection();       
    }       
    /**     
     * 释放连接     
     * freeConnection     
     * @param conn     
     */      
    public void freeConnection(Connection conn){       
        if(conn!=null){       
            try {       
                conn.close();       
            } catch (SQLException e) {                     
                e.printStackTrace();       
            }       
        }       
    }       
    /**     
     * 释放连接     
     * freeConnection     
     * @param name     
     * @param con     
     */      
    public void freeConnection (String name,Connection con){       
        freeConnection(con);       
    }       

    public void getQuery() {               
        try {       
            Connection conn = getConnection();       
            if(conn != null){       
                Statement statement = conn.createStatement();       
                ResultSet rs = statement.executeQuery("select id,uuid from Transcription");       
                int c = rs.getMetaData().getColumnCount();       
                while(rs.next()){                          
                    System.out.println();       
                    for(int i=1;i<=c;i++){       
                        System.out.print(rs.getObject(i));       
                    }       
                }       
                rs.close();       
            }       
            freeConnection(conn);       
        } catch (SQLException e) {                 
            e.printStackTrace();       
        }       

    }       


    public static void main(String[] args) {
    	ProxoolPoolManager pool=new ProxoolPoolManager();
    	pool.getQuery();
	}
}

重启数据库不影响连接池