http://sunnylocus.javaeye.com/blog/359570
proxool一个数据库连接池框架,提供了对你选择的其它类型的驱动程序的连接池封装。可以非常简单的移植到现存的代码中。完全可配置。快速,成熟,健壮。可以透明地为你现存的JDBC驱动程序增加连接池功能。到目前为止最新版本是proxool 0.9.1,可从官网下载最新版本http://proxool.sourceforge.net
一、配置proxool.xml文件
- <?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>dbname</alias> <!--数据源的别名-->
- <driver-url>jdbc:oracle:thin:@127.0.0.1:1521:testdb</driver-url><!--url连接串-->
- <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> <!--驱动类-->
- <driver-properties>
- <property name="user" value="username" /> <!--用户名-->
- <property name="password" value="password" /><!--密码-->
- </driver-properties>
- <!--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>90000</house-keeping-sleep-time>
- <!--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-->
- <maximum-new-connections>10</maximum-new-connections>
- <!--最少保持的空闲连接数(默认2个)-->
- <prototype-count>5</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 sysdate from dual</house-keeping-test-sql>
- </proxool>
- </something-else-entirely>
二、配置web.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
- http://java.sun.com/xml/ns/j2ee/web-app_2_4.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>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>
- <error-page>
- <error-code>401</error-code>
- <location>/401.jsp</location>
- </error-page>
- </web-app>
ServletConfigurator:加载并初始化proxool.xml文件,因为它是连接数据库的.其他很多模块都用到数据,所以必须首先加载它
load-on-startup:数值越小,就会先被加载初始化
Admin:监控数据库连接池的连接情况
//获得数据库连接的语句
Connection conn=DriverManager.getConnection("proxool.dbname");
注意:在401.jsp页面中必须加
<%
response.setHeader("WWW-Authenticate", "Basic realm=/"Tomcat Manager Application/"");
%>这句话,否则在访问/admin察看连接池信息时,会直接跳转到401.jsp页面。我们是想让访问admin/的用户必须输入用户名和密码,且必须是manager角色,三次输入不正确才会跳到401.jsp页面,如图
输入正确用户名和密码后才能看到proxool池的信息
三、更详细的proxool.xml的配置属性说明:
- <?xml version="1.0" encoding="ISO-8859-1"?>
- <!--
- Properties for Proxool Configurator testing. Defines the same parameters as
- TestHelper.buildCompleteAlternativeProperties()
- -->
- <something-else-entirely xmlns="http://sumthin.else.entirely" xmlns:proxool="The latest version is available at http://proxool.sourceforge.net/xml-namespace">
- <proxool:proxool>
- <proxool:alias>xml-test-ns</proxool:alias>
- <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url>
- <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class>
- <proxool:driver-properties>
- <proxool:property name="user" value="sa"/>
- <proxool:property name="password" value=""/>
- </proxool:driver-properties>
- <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time>
- <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql>
- <proxool:maximum-connection-count>10</proxool:maximum-connection-count>
- <proxool:minimum-connection-count>3</proxool:minimum-connection-count>
- <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours -->
- <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle>
- <proxool:recently-started-threshold>40000</proxool:recently-started-threshold>
- <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime>
- <proxool:maximum-active-time>60000</proxool:maximum-active-time>
- <proxool:verbose>true</proxool:verbose>
- <proxool:trace>true</proxool:trace>
- <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception>
- <proxool:prototype-count>2</proxool:prototype-count>
- </proxool:proxool>
- <nothing-to-do-with-proxool>
- <proxool:proxool>
- <proxool:alias>xml-test-ns-2</proxool:alias>
- <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url>
- <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class>
- <proxool:driver-properties>
- <proxool:property name="user" value="sa"/>
- <proxool:property name="password" value=""/>
- </proxool:driver-properties>
- <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time>
- <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql>
- <proxool:maximum-connection-count>10</proxool:maximum-connection-count>
- <proxool:minimum-connection-count>3</proxool:minimum-connection-count>
- <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours -->
- <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle>
- <proxool:recently-started-threshold>40000</proxool:recently-started-threshold>
- <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime>
- <proxool:maximum-active-time>60000</proxool:maximum-active-time>
- <proxool:verbose>true</proxool:verbose>
- <proxool:trace>true</proxool:trace>
- <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception>
- <proxool:prototype-count>2</proxool:prototype-count>
- </proxool:proxool