proxool连接池配置详细说明

目前市面上三个主流连接池从性能上排名如下：proxool>c3p0>dbcp，proxool还提供了可视化的连接池实时监控工具，所以既稳定又方便，配置也是非常容易的事情。下面我来讲讲我如何配置proxool连接池的。
1、下载相关资源。

从http://proxool.sourceforge.net/ 站点上下载我们需要的资源，proxool-0.9.1是最新版本，解压后从lib下copy里面的2个JAR包 proxool-0.9.1.jar和

proxool-cglib.jar至项目中去。如果不加proxool-cglib.jar的话会报java.lang.ClassNotFoundException:org.logicalcobwebs.cglib.proxy.Callback异常。

2、首先在WEB-INF目录下新建一个proxool.xml文件。

 <? xml  version = "1.0"  encoding = "UTF-8" ?>
 < proxool-config >
 < proxool >
 < alias > datasource1 </ alias >
 < driver-url > jdbc:mysql://localhost:3306/datasource1 </ driver-url >
 < driver-class > com.mysql.jdbc.Driver </ driver-class >
 < driver-properties >
 < property  name = "user"  value = "root"  />
 < property  name = "password"  value = "root"  />
 </ driver-properties >
 < house-keeping-sleep-time > 90000 </ house-keeping-sleep-time >
 < maximum-new-connections > 20 </ maximum-new-connections >
 < prototype-count > 5 </ prototype-count >
 < maximum-connection-count > 1000 </ maximum-connection-count >
 < minimum-connection-count > 10 </ minimum-connection-count >
 </ proxool >

 < proxool >
 < alias > datasource2 </ alias >
 < driver-url > jdbc:sybase:Tds:localhost:16428/datasource2 </ driver-url >
 < driver-class > com.sybase.jdbc3.jdbc.SybDriver </ driver-class >
 < driver-properties >
 < property  name = "user"  value = "dba"  />
 < property  name = "password"  value = "dba"  />
 </ driver-properties >
 < house-keeping-sleep-time > 90000 </ house-keeping-sleep-time >
 < maximum-new-connections > 20 </ maximum-new-connections >
 < prototype-count > 5 </ prototype-count >
 < maximum-connection-count > 1000 </ maximum-connection-count >
 < minimum-connection-count > 10 </ minimum-connection-count >
 </ proxool >
 </ proxool-config >

<?xml version="1.0" encoding="UTF-8"?> <proxool-config> <proxool> <alias>datasource1</alias> <driver-url>jdbc:mysql://localhost:3306/datasource1</driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="root" /> <property name="password" value="root" /> </driver-properties> <house-keeping-sleep-time>90000</house-keeping-sleep-time> <maximum-new-connections>20</maximum-new-connections> <prototype-count>5</prototype-count> <maximum-connection-count>1000</maximum-connection-count> <minimum-connection-count>10</minimum-connection-count> </proxool> <proxool> <alias>datasource2</alias> <driver-url>jdbc:sybase:Tds:localhost:16428/datasource2</driver-url> <driver-class>com.sybase.jdbc3.jdbc.SybDriver</driver-class> <driver-properties> <property name="user" value="dba" /> <property name="password" value="dba" /> </driver-properties> <house-keeping-sleep-time>90000</house-keeping-sleep-time> <maximum-new-connections>20</maximum-new-connections> <prototype-count>5</prototype-count> <maximum-connection-count>1000</maximum-connection-count> <minimum-connection-count>10</minimum-connection-count> </proxool> </proxool-config>

我在里面配置了2个不同数据库的数据源，你可以根据需要配置多个，其中具体的参数属性我会在下面全部予以说明。
3、配置web.xml文件。

 <? xml  version = "1.0"  encoding = "UTF-8"  ?>
 < web-app  version = "2.5"  xmlns = "http://java.sun.com/xml/ns/javaee"
 xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation = "http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
 < 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 > datasource_situation </ servlet-name >
 < servlet-class >
 org.logicalcobwebs.proxool.admin.servlet.AdminServlet
 </ servlet-class >
 </ servlet >
 < servlet-mapping >
 < servlet-name > datasource_situation </ servlet-name >
 < url-pattern > /datasource_situation </ 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 > /datasource_situation </ 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 > proxoolmanagerApplication </ realm-name >
 </ login-config >
 < security-role >
 < description >
 TherolethatisrequiredtologintotheManager
 Application
 </ description >
 < role-name > manager </ role-name >
 </ security-role >
 < error-page >
 < error-code > 401 </ error-code >
 < location > /401.jsp </ location >
 </ error-page >
 </ web-app >

<?xml version="1.0" encoding="UTF-8" ?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <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>datasource_situation</servlet-name> <servlet-class> org.logicalcobwebs.proxool.admin.servlet.AdminServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>datasource_situation</servlet-name> <url-pattern>/datasource_situation</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>/datasource_situation</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> <error-page> <error-code>401</error-code> <location>/401.jsp</location> </error-page> </web-app>

<load-on-startup>1</load-on-startup>用来设置加载属性，一定要保证在其他配置项之前加载。

 < servlet >
 < servlet-name > datasource_situation </ servlet-name >
 < servlet-class >
 org.logicalcobwebs.proxool.admin.servlet.AdminServlet
 </ servlet-class >
 </ servlet >
 < servlet-mapping >
 < servlet-name > datasource_situation </ servlet-name >
 < url-pattern > /datasource_situation </ url-pattern >
 </ servlet-mapping >

<servlet> <servlet-name>datasource_situation</servlet-name> <servlet-class> org.logicalcobwebs.proxool.admin.servlet.AdminServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>datasource_situation</servlet-name> <url-pattern>/datasource_situation</url-pattern> </servlet-mapping>

这个属性是用来提供察看连接池信息的工具，既在域名后跟上/datasource_situation就可以查看了，当然名字可以自己定义。如果你想限制用户和密码来访问就用

 < security-constraint >
 < web-resource-collection >
 < web-resource-name > proxool </ web-resource-name >
 < url-pattern > /datasource_situation </ 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 > proxoolmanagerApplication </ realm-name >
 </ login-config >
 < security-role >
 < description >
 TherolethatisrequiredtologintotheManager
 Application
 </ description >
 < role-name > manager </ role-name >
 </ security-role >
 < error-page >
 < error-code > 401 </ error-code >
 < location > /401.jsp </ location >
 </ error-page >

<security-constraint> <web-resource-collection> <web-resource-name>proxool</web-resource-name> <url-pattern>/datasource_situation</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> <error-page> <error-code>401</error-code> <location>/401.jsp</location> </error-page>

这段配置就限定了只有输入了TOMCAT的管理员帐号密码后就能登陆连接池查看工具了，如果连续三次登陆失败，进入401.jsp页面。401.jsp要加入下段代码

response.setHeader("WWW-Authenticate", "Basic realm=\"Tomcat Manager Application\"");

4、配置连接池连接类。

 package selfservice;

 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;


 public  class PoolManager{

 private  static  int activeCount= 0 ;


 public PoolManager(){

 }
 /**
 *获取连接
 *getConnection
 *@paramname
 *@return
 */
 public ConnectiongetConnection(){
 try {
 Class.forName("org.logicalcobwebs.proxool.ProxoolDriver" ); //proxool驱动类
 Connectionconn=DriverManager.getConnection("proxool.datasource1" );
 //此处的datasource1是在proxool.xml中配置的连接池别名，当然根据需要可以用datasource2
 showSnapshotInfo();

 return conn;
 }catch (Exceptionex){
 ex.printStackTrace();
 }
 return  null ;
 }
 /**
 *此方法可以得到连接池的信息
 *showSnapshotInfo
 */
 private  void showSnapshotInfo(){
 try {
 SnapshotIFsnapshot=ProxoolFacade.getSnapshot("datasource1" , 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
 {
 System.out.println("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 (ProxoolExceptione){
 e.printStackTrace();
 }
 }
 /**
 *获取连接
 *getConnection
 *@paramname
 *@return
 */
 public ConnectiongetConnection(Stringname){
 return getConnection();
 }
 /**
 *释放连接
 *freeConnection
 *@paramconn
 */
 public  void freeConnection(Connectionconn){
 if (conn!= null ){
 try {
 conn.close();
 }catch (SQLExceptione){
 e.printStackTrace();
 }
 }
 }
 /**
 *释放连接
 *freeConnection
 *@paramname
 *@paramcon
 */
 public  void freeConnection(Stringname,Connectioncon){
 freeConnection(con);
 }

 public  void getQuery(){
 try {
 Connectionconn=getConnection();
 if (conn!= null ){
 Statementstatement=conn.createStatement();
 ResultSetrs=statement.executeQuery("select*fromtblgxinterface" );
 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 (SQLExceptione){
 e.printStackTrace();
 }

 }

 }

package selfservice; 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; public class PoolManager { private static int activeCount = 0; public PoolManager(){ } /** * 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.datasource1"); //此处的datasource1是在proxool.xml中配置的连接池别名，当然根据需要可以用datasource2 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("datasource1", 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 { System.out.println("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){ e.printStackTrace(); } } /** * 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 * from tblgxinterface"); 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(); } } }

测试成功！

下面我来介绍一下proxool.xml文件中关于proxool各个属性的详细说明：

fatal-sql-exception : 它是一个逗号分割的信息片段.当一个SQL异常发生时,他的异常信息将与这个信息片段进行比较.如果在片段中存在,那么这个异常将被认为是个致命错误 (Fatal SQL Exception ).这种情况下,数据库连接将要被放弃.无论发生什么,这个异常将会被重掷以提供给消费者.用户最好自己配置一个不同的异常来抛出.

fatal-sql-exception-wrapper-class : 正如上面所说,你最好配置一个不同的异常来重掷.利用这个属性,用户可以包装SQLException,使他变成另外一个异常.这个异常或者继承SQLException或者继承字RuntimeException.proxool 自带了2个实现:'org.logicalcobwebs.proxool .FatalSQLException' 和'org.logicalcobwebs.proxool .FatalRuntimeException' .后者更合适.

house-keeping-sleep-time : house keeper 保留线程处于睡眠状态的最长时间,house keeper 的职责就是检查各个连接的状态,并判断是否需要销毁或者创建.

house-keeping-test-sql : 如果发现了空闲的数据库连接.house keeper 将会用这个语句来测试.这个语句最好非常快的被执行.如果没有定义,测试过程将会被忽略。

injectable-connection-interface : 允许proxool 实现被代理的connection对象的方法.

injectable-statement-interface : 允许proxool 实现被代理的Statement 对象方法.

injectable-prepared-statement-interface : 允许proxool 实现被代理的PreparedStatement 对象方法.

injectable-callable-statement-interface : 允许proxool 实现被代理的CallableStatement 对象方法.

jmx : 略

jmx-agent-id : 略

jndi-name : 数据源的名称

maximum-active-time : 如果housekeeper 检测到某个线程的活动时间大于这个数值.它将会杀掉这个线程.所以确认一下你的服务器的带宽.然后定一个合适的值.默认是5分钟.

maximum-connection-count : 最大的数据库连接数.

maximum-connection-lifetime : 连接最大生命时间默认4小时

minimum-connection-count : 最小的数据库连接数

overload-without-refusal-lifetime : 略

prototype-count : 连接池中可用的连接数量.如果当前的连接池中的连接少于这个数值.新的连接将被建立(假设没有超过最大可用数).例如.我们有3个活动连接2个可用连接, 而我们的prototype-count是4,那么数据库连接池将试图建立另外2个连接.这和 minimum-connection-count不同. minimum-connection-count把活动的连接也计算在内.prototype-count 是spare connections 的数量.

recently-started-threshold : 略

simultaneous-build-throttle : 同时最大连接数

statistics : 连接池使用状况统计。 参数“10s,1m,1d”

statistics-log-level : 日志统计跟踪类型。 参数“ERROR”或 “INFO”

test-before-use : 略

test-after-use : 略

trace : 如果为true,那么每个被执行的SQL语句将会在执行期被log记录(DEBUG LEVEL).你也可以注册一个ConnectionListener (参看ProxoolFacade)得到这些信息.

verbose : 详细信息设置。 参数 bool 值

希望大家能讨论一下关于proxool更多的东西，谢谢！