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.下载proxool

一.下载proxool
去proxool官网下载proxool,最新版本是0.9.1。

下载完后解压,把proxool.jar和proxool-cglib.jar放入你要配置的项目的lib目录下.

二.配置proxool.xml
添加proxool.xml文件到项目的/WEB-INF下.
连接数据库Oracle的配置如下:

<? xmlversion="1.0"encoding="ISO-8859-1" ?>

< something-else-entirely >
< proxool >
< alias > dbname </ alias >
< driver-url > jdbc:oracle:thin:@127.0.0.1:1521:testdb </ driver-url >
< driver-class > oracle.jdbc.driver.OracleDriver </ driver-class >
< driver-properties >
< property name ="user" value ="username" />
< property name ="password" value ="password" />
</ driver-properties >
< maximum-connection-count > 100 </ maximum-connection-count >
< minimum-connection-count > 10 </ minimum-connection-count >
< house-keeping-sleep-time > 90000 </ house-keeping-sleep-time >
< maximum-new-connections > 10 </ maximum-new-connections >
< prototype-count > 5 </ prototype-count >
< test-before-use > true </ test-before-use >
< house-keeping-test-sql > select1fromdual </ house-keeping-test-sql >
</ proxool >
</ something-else-entirely >

alias:数据源的别名
driver-url:url连接串,须确定用户名和密码
driver-class:驱动名
username:用户名(proxool没有使用,但是不能没有)
password:密码(proxool没有使用,但是不能没有)
maximum-connection-count: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
minimum-connection-count:最小连接数(默认2个)
house-keeping-sleep-time: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)
prototype-count:最少保持的空闲连接数(默认2个)
maximum-new-connections: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
test-before-use和house-keeping-test-sql:测试用

三.配置web.xml

< servlet >
< servlet-name > contextConfigLocation </ servlet-name >
< servlet-class >
org.springframework.web.context.ContextLoaderServlet
</ servlet-class >
< load-on-startup > 2 </ load-on-startup >
</ servlet >

< 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 >

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:值越小级别就越高，就先被加载初始化
contextConfigLocation:加载Spring的配置文件,如果以前是:

< listener >
< listener-class >
org.springframework.web.context.ContextLoaderListener
</ listener-class >
</ listener >

则必须改成

设置加载顺序为proxool.xml之后,如果设置成监听器的形式,因监听器会在servlet之前加载,所以会报错.
Admin:监控数据库连接池的连接情况

四.配置applicationContext.xml,整合Spring和proxool

< bean id ="dataSource"
class ="org.springframework.jdbc.datasource.DriverManagerDataSource" >
< property name ="driverClassName"
value ="org.logicalcobwebs.proxool.ProxoolDriver" />
< property name ="url" value ="proxool.dbname" />
</ bean >

<property name="url">要配置成 proxool. + proxool.xml中的别名

配置基本完成,还有其它配置方式,但个人比较喜好这种.

另附加一份proxool.xml的配置属性说明:

<? xmlversion="1.0"encoding="ISO-8859-1" ?>

<!--

PropertiesforProxoolConfiguratortesting.Definesthesameparametersas

TestHelper.buildCompleteAlternativeProperties()

-->

< something-else-entirely xmlns ="http://sumthin.else.entirely" xmlns:proxool ="Thelatestversionisavailableathttp://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 > selectCURRENT_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 >

< 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 > Fatalerror </ 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 >