Proxool 0.9.1的配置与应用

Proxool 0.9.1的配置与应用

 

Proxool老牌的数据库连接池了，褒贬不一，性能上还行。目前最新版本是0.9.1，相对之前版本的配置有些变动。这里以MySQL5为例做一个简单数据库连接池配置。

 

环境：

 

MySQL5.x

JDK1.5

Proxool 0.9.1

 

一、配置文件

 

proxool.xml

<? xml version ="1.0" encoding ="UTF-8" ?>
< something-else-entirely >
         < proxool >
                 < alias >ds </ alias >
                <!-- 数据源的别名-->
                 < driver-url >jdbc:mysql://192.168.104.191:3306/testdb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&zeroDateTimeBehavior=convertToNull </ driver-url >
                <!-- url连接串-->
                 < driver-class >com.mysql.jdbc.Driver </ driver-class >
                <!-- 驱动类-->
                 < driver-properties >
                         < property name ="user" value ="vcom" />
                        <!-- 用户名-->
                         < property name ="password" value ="vcom" />
                        <!-- 密码-->
                 </ driver-properties >
                 <!-- 是指在任一时刻，可以（同时）建立的最大连接数，也就是说，就是已经请求的、但还没可用的新连接数量-->
                <simultaneous-build-throttle>10</simultaneous-build-throttle>
                <!-- 最大连接数(默认5个),超过了这个连接数,再有请求时,就排在队列中等候,最大的等待请求数由maximum-new-connections决定 -->
                 < maximum-connection-count >100 </ maximum-connection-count >
                <!-- 最小连接数(默认2个)-->
                 < minimum-connection-count >10 </ minimum-connection-count >
                <!-- proxool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 默认30秒-->
                 < house-keeping-sleep-time >120000 </ house-keeping-sleep-time >
                <!-- 最少保持的空闲连接数(默认2个)-->
                 < prototype-count >10 </ prototype-count >
                <!-- 在使用之前测试-->
                 < test-before-use >true </ test-before-use >
                <!-- 用于保持连接的测试语句 -->
                 < house-keeping-test-sql >select 1 </ house-keeping-test-sql >
         </ proxool >
</ something-else-entirely >

 

粗体部分是变化部分，上面有详细说明！

 

二、测试类

 

package lavasoft;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.logicalcobwebs.proxool.ProxoolException;
import org.logicalcobwebs.proxool.configuration.JAXPConfigurator;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.*;
import java.util.List;
import java.util.Properties;

/**
* 简单的JDBC工具类
*
* @author leizhimin 2009-11-23 17:35:26
*/
public class MyDB {
         private static final Log log = LogFactory.getLog(MyDB. class);
         private static final boolean useDBPool = true;     //是否使用数据库连接池
         private static String dburl = null;
         private static String user = null;
         private static String password = null;
         private static Properties props = new Properties();

         static {
                init();
        }

         public static void init() {
                 if (useDBPool) {
                         try {
                                JAXPConfigurator.configure( "proxool.xml", false);
//                                JAXPConfigurator.configure("src/proxool.xml", false);
                        } catch (ProxoolException e) {
                                e.printStackTrace();
                        }
                         return;
                }
                 try {
//                        props.load(new FileInputStream("/jdbc.properties"));
                        props.load(MyDB. class.getResourceAsStream( "/jdbc.properties"));
                } catch (IOException e) {
                        log.error( "#ERROR# :系统加载sysconfig.properties配置文件异常，请检查！", e);
                }
                dburl = props.getProperty( "jdbc.url");
                user = props.getProperty( "jdbc.username").trim();
                password = props.getProperty( "jdbc.password").trim();
                System.out.println(dburl);
                System.out.println(user);
                System.out.println(password);
                 //注册驱动类
                 try {
                        Class.forName(props.getProperty( "jdbc.driver"));
                } catch (ClassNotFoundException e) {
                        log.error( "#ERROR# :加载数据库驱动异常，请检查！", e);
                         throw new RuntimeException(e);
                }
        }


         public static void main(String[] args) throws FileNotFoundException {

                 for ( int i = 0; i < 5; i++) {
                        Connection conn = getConnection();
                        System.out.println(conn == null ? "没连上" : "连上了");
//                        System.out.println("--------");
//                closeConnection(conn);                        
                }

        }

         /**
         * 创建一个数据库连接
         *
         * @return 一个数据库连接
         */
         public static Connection getConnection() {
                Connection conn = null;
                 //根据连接池配置创建数据库连接
                 if (useDBPool) {
                         try {
                                conn = DriverManager.getConnection( "proxool.ds");
                        } catch (SQLException e) {
                                log.error( "#ERROR# :无法从数据库连接池获取到数据库连接！");
                                 throw new RuntimeException(e);
                        }
                         return conn;
                }
                 //根据JDBC配置创建数据库连接
                 try {
                        conn = DriverManager.getConnection(dburl, user, password);
                } catch (SQLException e) {
                        log.error( "#ERROR# :创建数据库连接发生异常，请检查！", e);
                         throw new RuntimeException(e);
                }
                 return conn;
        }

         /**
         * 在一个数据库连接上执行一个静态SQL语句查询
         *
         * @param conn            数据库连接
         * @param staticSql 静态SQL语句字符串
         * @return 返回查询结果集ResultSet对象
         */
         public static ResultSet executeQuery(Connection conn, String staticSql) {
                ResultSet rs = null;
                 try {
                         //创建执行SQL的对象
                        Statement stmt = conn.createStatement();
                         //执行SQL，并获取返回结果
                        rs = stmt.executeQuery(staticSql);
                } catch (SQLException e) {
                        log.error( "#ERROR# :执行SQL语句出错，请检查！\n" + staticSql, e);
                         throw new RuntimeException(e);
                }
                 return rs;
        }

         /**
         * 在一个数据库连接上执行一个静态SQL语句
         *
         * @param conn            数据库连接
         * @param staticSql 静态SQL语句字符串
         */
         public static void executeSQL(Connection conn, String staticSql) {
                 try {
                         //创建执行SQL的对象
                        Statement stmt = conn.createStatement();
                         //执行SQL，并获取返回结果
                        stmt.execute(staticSql);
                } catch (SQLException e) {
                        log.error( "#ERROR# :执行SQL语句出错，请检查！\n" + staticSql, e);
                         throw new RuntimeException(e);
                }
        }

         /**
         * 在一个数据库连接上执行一批静态SQL语句
         *
         * @param conn        数据库连接
         * @param sqlList 静态SQL语句字符串集合
         */
         public static void executeBatchSQL(Connection conn, List<String> sqlList) {
                 try {
                         //创建执行SQL的对象
                        Statement stmt = conn.createStatement();
                         for (String sql : sqlList) {
                                stmt.addBatch(sql);
                        }
                         //执行SQL，并获取返回结果
                        stmt.executeBatch();
                } catch (SQLException e) {
                        log.error( "#ERROR# :执行批量SQL语句出错，请检查！", e);
                }
        }

         public static void closeConnection(Connection conn) {
                 if (conn == null) return;
                 try {
                         if (!conn.isClosed()) {
                                 //关闭数据库连接
                                conn.close();
                        }
                } catch (SQLException e) {
                        log.error( "#ERROR# :关闭数据库连接发生异常，请检查！", e);
                         throw new RuntimeException(e);
                }
        }
}

 

运行结果：

[INFO] 2010-02-25 13:05:20 [org.logicalcobwebs.proxool.ProxoolFacade] Proxool 0.9.1 (23-Aug-2008 11:10)
连上了
连上了
连上了
连上了
连上了
[INFO] 2010-02-25 13:05:22 [org.logicalcobwebs.proxool.ds] Shutting down 'ds' pool immediately [Shutdown Hook]
[INFO] 2010-02-25 13:05:22 [org.logicalcobwebs.proxool.ConnectionPool] Waiting until Thu Feb 25 13:05:22 CST 2010 for all connections to become inactive (active count is 5).
[WARN] 2010-02-25 13:05:22 [org.logicalcobwebs.proxool.ConnectionPool] Shutdown waited for 0 milliseconds for all the connections to become inactive but the active count is still 5. Shutting down anyway.
[INFO] 2010-02-25 13:05:22 [org.logicalcobwebs.proxool.PrototyperController] Stopping Prototyper thread
[INFO] 2010-02-25 13:05:22 [org.logicalcobwebs.proxool.HouseKeeperController] Stopping HouseKeeper thread

Process finished with exit code 0

 

Proxool提供的配置方式很多，这里进选择最常用的xml方式，另外的方式也很简单，可以参看官方文档：

http://proxool.sourceforge.net/index.html

http://proxool.sourceforge.net/configure.html

 

三、Proxool很扯蛋的问题----找不到配置文件

 

proxool的配置文件加载做的比较差劲，通过两个类来加载配置文件：

org.logicalcobwebs.proxool.configuration.PropertyConfigurator

org.logicalcobwebs.proxool.configuration.ServletConfigurator

org.logicalcobwebs.proxool.configuration.XMLConfigurator

org.logicalcobwebs.proxool.configuration.JAXPConfigurator

org.logicalcobwebs.proxool.configuration.AvalonConfigurator

这几个类加载配置文件时候，常常会提示找不到配置文件，其原因是proxool在读取CLASSPATH下路径有问题，经常看到一种情况就是，在开发环境IDE环境下面测试通过，在打包后脱离IDE环境独立运行时候就提示找不到配置文件。这里有一个简单的解决方法就是不要使用文件名指定配置文件，而是通过读取CLASSPATH下的配置文件流，形成字节流传递给配置工具类来实现。比如：

         public static void init() {
                 //初始化数据库连接配置参数
                InputStream in = MyDB. class.getResourceAsStream( "/proxool.xml");
                Reader reader = null;
                 try {
                        reader = new InputStreamReader(in, "GBK");
                } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                }
                 try {
                        JAXPConfigurator.configure(reader, false);
                } catch (ProxoolException e) {
                        e.printStackTrace();
                }
        }

 

在初始化Proxool环境的时候，千万不要把第二个验证参数设置为true，否则老提示验证失败，但是配置文件语法什么都没错，这个问题我仅仅发现了，但没找到根本原因，解决办事是只需要将其设置为false就行。

 

四、使用ProxoolDataSource

 

ProxoolDataSource提供了一个java.sql.DataSource接口的简单实现，不过需要一个个的设置属性，比较麻烦，大致思路如下：

public class TestProxoolDS {
         private static ProxoolDataSource ds = null;


         public void init(){

                ds = new ProxoolDataSource();
                ds.setDriver( "com.mysql.jdbc.Driver");
                ds.setDriverUrl( "jdbc:mysql://192.168.104.191:3306/cdn");    
                ds.setUser("vcom");
                ds.setPassword("vcom");
                ds.setAlias("ds");
                ds.setMaximumConnectionCount(5);
                ds.setMinimumConnectionCount(0);
                ds.setMaximumActiveTime(5);
                //todo:继续设置属性，直到没有空指针异常为止
        }

        public static void main(String argsp[]) throws SQLException {
                        Connection conn = ds.getConnection();
                        System.out.println(conn == null ? "没连上" : "连上了");        }
}

 

 

本文出自 “熔 岩” 博客，请务必保留此出处http://lavasoft.blog.51cto.com/62575/278521