阿里巴巴druid链接池

<dependency>  
       <groupId>com.alibaba</groupId>  
       <artifactId>druid</artifactId>  
       <version>0.2.15</version>  
</dependency>

1.依赖

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">   
    <!-- 基本属性 url、user、password -->  
    <property name="url" value="${jdbc_url}" />  
    <property name="username" value="${jdbc_user}" />  
    <property name="password" value="${jdbc_password}" />  
        
    <!-- 配置初始化大小、最小、最大 -->  
    <property name="initialSize" value="1" />  
    <property name="minIdle" value="1" />   
    <property name="maxActive" value="20" />  
   
    <!-- 配置获取链接等待超时的时间 -->  
    <property name="maxWait" value="60000" />  
   
    <!-- 配置间隔多久才进行一次检测，检测须要关闭的空闲链接，单位是毫秒 -->  
    <property name="timeBetweenEvictionRunsMillis" value="60000" />  
   
    <!-- 配置一个链接在池中最小生存的时间，单位是毫秒 -->  
    <property name="minEvictableIdleTimeMillis" value="300000" />  
　　<!-- 超过期间限制是否回收 -->
　　<property name="removeAbandoned" value="true" />
　　<!-- 超过期间限制多长； -->
　　<property name="removeAbandonedTimeout" value="1800" />
    
    <property name="validationQuery" value="SELECT 'x'" />  
    <property name="testWhileIdle" value="true" />  
    <property name="testOnBorrow" value="false" />  
    <property name="testOnReturn" value="false" />  
   
    <!-- 打开PSCache，而且指定每一个链接上PSCache的大小 -->  
    <property name="poolPreparedStatements" value="true" />  
    <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />  
   
    <!-- 配置监控统计拦截的filters，去掉后监控界面sql没法统计 -->  
    <property name="filters" value="stat" />   
</bean>

2.配置链接池

<filter>
    <filter-name>DruidWebStatFilter</filter-name>  
    <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>  
    <init-param>  
        <param-name>exclusions</param-name>  
        <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>  
    </init-param>  
</filter>  
<filter-mapping>  
        <filter-name>DruidWebStatFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
</filter-mapping>

<servlet> 
        <servlet-name>DruidStatView</servlet-name>  
        <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>  
</servlet>  
<servlet-mapping>  
        <servlet-name>DruidStatView</servlet-name>  
        <url-pattern>/druid/*</url-pattern>  
</servlet-mapping>

3.web.xml 配置