1.引入依賴

<!-- 連線池 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>${druid-version}</version>
</dependency>

<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.1.xsd
 
       ">
<!-- 資料來源配置 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init"
destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}" />
        <property name="url" value="${jdbc.url}" />
        <property 
 
name="username" value="${jdbc.username}" />
        <property name="password" value="${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" />
<!-- 配置獲取連線等待超時的時間 -->
<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線，單位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="60000" />
<!-- 配置一個連線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" />
<!-- 開啟PSCache，並且指定每個連線上PSCache的大小, 如果用Oracle，則把poolPreparedStatements配置為true，
                    mysql可以配置為false。 -->
<property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
value="20" />
<!-- 配置監控統計攔截的filters，去掉後監控介面sql無法統計 -->
<property name="filters" value="stat,log4j" />
<!--Start 慢sql監控及log4j設定-->
<property name="proxyFilters">
            <list>
                <ref bean="stat-filter"/>
                <ref bean="log-filter"/>
            </list>
        </property>
    </bean>
<!--End 慢sql監控及log4j設定,不想監控的話將proxyFilters屬性刪除即可 -->
        <!-- 慢SQL記錄 -->
<bean id="stat-filter" class="com.alibaba.druid.filter.stat.StatFilter">
            <property name="mergeSql" value="true"/>
<!-- 慢sql時間設定,即執行時間大於200毫秒的都是慢sql -->
<property name="slowSqlMillis" value="200"/>
            <property name="logSlowSql" value="true"/>
        </bean>
        <bean id="log-filter" class="com.alibaba.druid.filter.logging.Log4jFilter">
            <property name="dataSourceLogEnabled" value="true" />
            <property name="statementExecutableSqlLogEnable" value="true" />
        </bean>
</beans>

<!--durid Filter-->
<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>
<!--展示Druid的統計資訊-->
<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>