druid 使用及配置

　　　　<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">  
            <property name="url" value="${ds1.url}" />  
            <property name="username" value="${ds1.username}" />  
            <property name="password" value="${ds1.password}" />  
                
<!--                 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->
            <property name="filters" value="stat" />  
            
<!--                 配置初始化大小、最小、最大 -->
            <property name="maxActive" value="20" />   
            <property name="initialSize" value="1" />  
            <property name="minIdle" value="1" />  
            
<!--                 配置获取连接等待超时的时间 -->
            <property name="maxWait" value="60000" />  
            
<!--                 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
            <property name="timeBetweenEvictionRunsMillis" value="3000" />  
                
<!--                 配置一个连接在池中最小生存的时间，单位是毫秒  -->
            <property name="minEvictableIdleTimeMillis" value="300000" />  
            <property name="validationQuery" value="SELECT ‘x‘" />  
            <property name="testWhileIdle" value="true" />  
            <property name="testOnBorrow" value="false" />  
            <property name="testOnReturn" value="false" />  
            
<!--                 打开PSCache，并且指定每个连接上PSCache的大小 -->
            <property name="poolPreparedStatements" value="true" />
            <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />  
        </bean>

<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>

<servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <init-param>
        <param-name>allow</param-name>
        <param-value></param-value>
    </init-param>
    <init-param>
        <param-name>deny</param-name>
        <param-value>192.168.146.1</param-value>
    </init-param>
    <init-param>
        <param-name>principalSessionName</param-name>
        <param-value>session.user</param-value>
    </init-param>
    <init-param>
        <param-name>principalCookieName</param-name>
        <param-value>cookies.user</param-value>
    </init-param>
</servlet>

<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>