Spring中使用proxool的配置+【转】proxool.xml配置属性说明

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:

<?xml version="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>select 1 from dual</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

<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:

<?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>

<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>