DBCP遷移到Druid

Maven_Spring_Mybatis 實例

• 第一步，修改applicationContext.xml文件，將

<!-- 數據庫連接池 -->
    <bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="#{db.driverClassName}"></property>
        <property name="url" value="#{db.url}"></property>
        <property name="username" value="#{db.username}"></property>
        <property name="password" value="#{db.password}"></property>
    </bean>

替換爲

<!-- 阿里Druid數據庫連接池 -->
     <bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> 
      <!-- 基本屬性 url、user、password -->
      <property name="url" value="#{db.url}" />
      <property name="username" value="#{db.username}" />
      <property name="password" value="#{db.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 -->
      <property name="filters" value="stat" /> 
  </bean>

• 第二步，修改pom.xml文件，將

        <!-- 數據庫dbcp(BasicDataSource) -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

替換成

        <!-- 阿里Druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.2</version>
        </dependency>

• 如果是web項目，修改web.xml配置druid監控

<!-- 連接池 啓用Web監控統計功能   start-->
    <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>
    <!-- 連接池 啓用Web監控統計功能   end-->

假如項目根目錄http://localhost:8080/demo-web
監控頁面路徑爲http://localhost:8080/demo-web/druid/index.html