druid 的介绍（网上的帖子很全）

https://www.cnblogs.com/niejunlei/p/5977895.html

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  宜宾商城的数据库连接池用的是阿里的druid。web.xml中配置内置监控页面，   以及监控慢sql等

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<?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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
                            http://www.springframework.org/schema/aop
                            http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
                            http://www.springframework.org/schema/tx
                            http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="${driverClassName}" />
        <property name="url" value="${url}" />
        <!--这里名字用username，assembly打包的时候好像读不到，不知道是不是变量冲突了。所以改为dusername了-->
        <property name="username" value="${dusername}" />
        <property name="password" value="${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="2000" />
        <!-- 配置获取连接等待超时的时间 -->
        <property name="maxWait" value="10000" />

        <!-- 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="60000" />

        <!-- 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" />

        <!-- 验证连接有效与否的SQL，不同的数据配置不同 -->
        <property name="validationQuery" value="${validationQuery}" />

        <property name="testWhileIdle" value="true" />

        <!-- 这里建议配置为TRUE，防止取到的连接不可用 -->
        <property name="testOnBorrow" value="true" />
        <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" />

        <property name="proxyFilters">
            <list>
                <ref bean="statFilter"/>
                <ref bean="logFilter"/>
            </list>
        </property>
    </bean>
    <bean id="logFilter" class="com.alibaba.druid.filter.logging.Slf4jLogFilter">
        <property name="statementExecutableSqlLogEnable" value="false" />
    </bean>

    <!-- 慢SQL记录 -->
    <bean id="statFilter" class="com.alibaba.druid.filter.stat.StatFilter">
        <!-- 慢sql时间设置,即执行时间大于200毫秒的都是慢sql -->
        <property name="slowSqlMillis" value="200"/>
        <property name="logSlowSql" value="true"/>
    </bean>

    <!-- druid spring monitor setting -->
    <bean id="druid-stat-interceptor"
          class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor">
    </bean>

    <bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut"
          scope="prototype">
        <property name="patterns">
            <list>
                <value>com.truelore.xunjia.service.*</value>
                <value>com.truelore.xunjia.dao.*</value>
            </list>
        </property>
    </bean>

    <aop:config>
        <aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut"/>
    </aop:config>

    <!-- session工厂 -->
    <bean id="sessionFactory"
          class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
            </props>
        </property>

        <!-- 注解方式配置 -->
        <property name="packagesToScan">
            <list>
                <value>com.truelore.xunjia.*</value>
            </list>
        </property>

    </bean>

    <!-- 配置事务 -->
    <bean name="txManager"
          class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>

    <!-- order 的值越小，越在外围-->
    <tx:annotation-driven transaction-manager="txManager" order="1" />
</beans>

---

web.xml

<!--fjf druid 监控页面-->
<servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <init-param>
        <!-- 允许清空统计数据 -->
        <param-name>resetEnable</param-name>
        <param-value>true</param-value>
    </init-param>
    <init-param>
        <!-- 用户名 -->
        <param-name>loginUsername</param-name>
        <param-value>elyg-xunjia-666</param-value>
    </init-param>
    <init-param>
        <!-- 密码 -->
        <param-name>loginPassword</param-name>
        <param-value>elyg-xunjia-223</param-value>
    </init-param>
</servlet>

<!-- 监控页面访问路径,自行配置 -->
<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>
    <!-- 不需要加入监控的文件 -->
    <init-param>
        <param-name>exclusions</param-name>
        <param-value>/public/*,*.js,*.css,/druid*,*.jsp,*.swf,*.html</param-value>
    </init-param>
    <init-param>
        <param-name>principalSessionName</param-name>
        <param-value>sessionInfo</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>

拓展：（之前有一篇配置多数据源的，如果druid配置多数据源）