etmvc中集成spring使用druid连接池

etmvc中ActiveRecord（下称AR）在使用上可以独立使用，其数据库的连接信息通过activerecord.properties进行配置，具体如下：

domain_base_class=com.et.ar.ActiveRecordBasecom.et.ar.ActiveRecordBase.driver_class=com.mysql.jdbc.Drivercom.et.ar.ActiveRecordBase.url=jdbc:mysql://localhost/ciccpsmembercom.et.ar.ActiveRecordBase.username=rootcom.et.ar.ActiveRecordBase.password=rootcom.et.ar.ActiveRecordBase.pool_size=5

但是AR提供的这个简单的连接池（其实根本称不上连接池技术）性能实在不敢恭维，于是本人就琢磨这如何引入别的连接池？

首先，JAVAEE下数据库连接池有很多选择，c3p、dhcp、proxool等，druid作为一名后起之秀，凭借其出色的性能，也逐渐印入了大家的眼帘，于是本人将目标锁定了druid。

然后，连接池怎了和etmvc结合起来，第一个想法就是使用spring，查了一下资料，在不使用spring的情况下，类似于dbcp，druid也提供了原生态的支持，但是本人实在懒得折腾了，所以还是通过集成spring来使用连接池。具体步骤如下：

1、下载druid，地址：http://repo1.maven.org/maven2/com/alibaba/druid/，得到druid的jar包，我这里是druid-0.2.9.jar；

2、下载spring，现在的spring基本都是3.0之后的，但是我这用2.5的，就一个spring.jar；

3、将上面的两个包导入到WEB-INF下的lib；

4、修改WEB-INF下的Web.xml，注意过滤器由DispatcherFilter改成SpringDispatcherFilter，在追加springframework的listener，不使用spring时的Web.xml如下：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>ciccpsMember</display-name>  <filter>  <filter-name>etmvc</filter-name>  <filter-class>com.et.mvc.DispatcherFilter</filter-class>  <init-param>  <param-name>controllerBasePackage</param-name>  <param-value>controllers</param-value>  </init-param>  <init-param>  <param-name>viewBasePath</param-name>  <param-value>/views</param-value>  </init-param>  </filter>  <filter-mapping>  <filter-name>etmvc</filter-name>  <url-pattern>/*</url-pattern>  </filter-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list></web-app>

修改后如下：

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>/WEB-INF/applicationContext.xml</param-value>  </context-param>  <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <display-name>ciccpsMember</display-name>  <filter>  <filter-name>etmvc</filter-name>  <filter-class>com.et.mvc.SpringDispatcherFilter</filter-class>  <init-param>  <param-name>controllerBasePackage</param-name>  <param-value>controllers</param-value>  </init-param>  <init-param>  <param-name>viewBasePath</param-name>  <param-value>/views</param-value>  </init-param>  </filter>  <filter-mapping>  <filter-name>etmvc</filter-name>  <url-pattern>/*</url-pattern>  </filter-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list></web-app>

5、删掉src下的activerecord.properties，追加一个dbconfig.properties，主要用于保存数据库及连接池的配置信息，内容如下：

url:jdbc:mysql://localhost:3306/ciccpsmemberdriverClassName:com.mysql.jdbc.Driverusername:rootpassword:rootfilters:statmaxActive:20initialSize:1maxWait:60000minIdle:10#maxIdle:15 timeBetweenEvictionRunsMillis:60000minEvictableIdleTimeMillis:300000 validationQuery:SELECT 'x'testWhileIdle:truetestOnBorrow:falsetestOnReturn:false#poolPreparedStatements:truemaxOpenPreparedStatements:20#\u5BF9\u4E8E\u957F\u65F6\u95F4\u4E0D\u4F7F\u7528\u7684\u8FDE\u63A5\u5F3A\u5236\u5173\u95EDremoveAbandoned:true#\u8D85\u8FC730\u5206\u949F\u5F00\u59CB\u5173\u95ED\u7A7A\u95F2\u8FDE\u63A5removeAbandonedTimeout:1800#\u5C06\u5F53\u524D\u5173\u95ED\u52A8\u4F5C\u8BB0\u5F55\u5230\u65E5\u5FD7logAbandoned:true

6、在WEB-INF下追加spring配置文件applicationContext.xml，dataSource就是连接池的配置，内容如下：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:p="http://www.springframework.org/schema/p"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">                          <bean id="propertyConfigurer"class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="locations"><list><value>/WEB-INF/classes/dbconfig.properties</value></list></property></bean><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"destroy-method="close"><property name="url" value="${url}" /><property name="username" value="${username}" /><property name="password" value="${password}" /><property name="driverClassName" value="${driverClassName}" /><property name="filters" value="${filters}" /><property name="maxActive" value="${maxActive}" /><property name="initialSize" value="${initialSize}" /><property name="maxWait" value="${maxWait}" /><property name="minIdle" value="${minIdle}" /><property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" /><property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" /><property name="validationQuery" value="${validationQuery}" /><property name="testWhileIdle" value="${testWhileIdle}" /><property name="testOnBorrow" value="${testOnBorrow}" /><property name="testOnReturn" value="${testOnReturn}" /><!-- <property name="maxOpenPreparedStatements"value="${maxOpenPreparedStatements}" /> --><property name="removeAbandoned" value="${removeAbandoned}" /> <!-- 打开removeAbandoned功能 -->    <property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" /> <!-- 1800秒，也就是30分钟 -->    <property name="logAbandoned" value="${logAbandoned}" /> <!-- 关闭abanded连接时输出错误日志 --></bean>    <bean class="com.et.ar.ConnectionFactoryBean"          p:dataSource-ref="dataSource"          p:adapterClass="com.et.ar.adapters.MySqlAdapter"          p:domainBaseClass="com.et.ar.ActiveRecordBase" />              <!-- ADD PERSISTENCE SUPPORT HERE (jpa, hibernate, etc) -->    </beans>

7、这样就配置好了，AR该怎用还是怎用，主要的是性能也上去了。

druid教程参考地址：http://blog.csdn.net/yunnysunny/article/details/8657095