Druid監控數據庫

之前做項目一直用的是C3p0做數據源，有博客說druid性能方面比c3p0等還要好，並且也支持監控，所以就將c3p0替換成Druid。

常見問題彙總詳細的說明了如何通過Maven下載，配置。下面爲Druid和Spring的部分配置(applicationContext.ml)：

 <!--配置文件-->
       <context:property-placeholder location="classpath:config.properties"/>

       <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
             init-method="init"   destroy-method="close">
           <property name="url" value="${jdbc.url}" />
           <property name="username" value="${jdbc.user}" />
           <property name="password" value="${jdbc.password}" />
           <property name="driverClassName" value="${jdbc.driverClass}" />

           <!-- 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" />

           <!-- 配置獲取連接等待超時的時間 -->
           <property name="maxWait" value="60000" />

           <!-- 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連接，單位是毫秒 -->
           <property name="timeBetweenEvictionRunsMillis" value="60000" />

           <!-- 配置一個連接在池中最小生存的時間，單位是毫秒 -->
           <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" />

           <!-- 打開PSCache，並且指定每個連接上PSCache的大小 -->
           <property name="poolPreparedStatements" value="true" />
           <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />

           <!-- 配置監控統計攔截的filters，去掉後監控界面sql無法統計 -->
           <property name="filters" value="stat,slf4j" />
         

           <!--定期把監控數據輸出到日誌-->
           <property name="timeBetweenLogStatsMillis" value="1800000" />
           <!--合併多個DruidDataSource的監控數據-->
           <!--<property name="useGlobalDataSourceStat" value="true" />-->
       </bean>

Web監控配置

  <filter>
        <filter-name>struts2Filter</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2Filter</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>struts2Filter</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>


    <filter>
        <filter-name>requestContextFilter</filter-name>
        <filter-class>org.springframework.web.filter.RequestContextFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>requestContextFilter</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>

    <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>

        <init-param>
            <param-name>sessionStatMaxCount</param-name>
            <param-value>1000</param-value>
        </init-param>

        <init-param>
            <param-name>sessionStatEnable</param-name>
            <param-value>true</param-value>
        </init-param>

        <init-param>
            <param-name>profileEnable</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>DruidWebStatFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

這裏面吧Strut的配置也貼出來了。之前將struts配置爲

 <filter>
        <filter-name>struts2Filter</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

結果http://localhost:8080/demo2/druid/報404錯誤

貼出效果圖：