druid数据库链接池

1. 引入jar包

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

2. 在spring配置文件里配置dataSource

<!--配置wxsr数据源 使用druid数据库链接池 -->
<bean id="druidDataSource_wxsr" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
    <!-- 基本属性 url、user、password -->
    <property name="url" value="${druid.wxsr.url}" />
    <property name="username" value="${druid.wxsr.username}" />
    <property name="password" value="${druid.wxsr.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" />

    <!-- 配置获取链接等待超时的时间 -->
    <property name="maxWait" value="60000" />

    <!-- 配置间隔多久才进行一次检测，检测须要关闭的空闲链接，单位是毫秒 -->
    <property name="timeBetweenEvictionRunsMillis" value="60000" />

    <!-- 配置一个链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' FROM DUAL" />
    <property name="testWhileIdle" value="true" />
    <property name="testOnBorrow" value="false" />
    <property name="testOnReturn" value="false" />

    <!-- 打开PSCache，而且指定每一个链接上PSCache的大小 -->
    <property name="poolPreparedStatements" value="true" />
    <property name="maxPoolPreparedStatementPerConnectionSize" value="20" />

    <!-- 配置监控统计拦截的filters -->
    <property name="filters" value="stat,log4j" />
</bean>

3. 配置WebStatFilter

<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>profileEnable</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>DruidWebStatFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

4. 用于展现Druid的统计信息的配置

<!-- 配置 Druid 监控信息显示页面 -->
<servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <init-param>
        <!-- 容许清空统计数据 -->
        <param-name>resetEnable</param-name>
        <param-value>true</param-value>
    </init-param>
    <init-param>
        <!-- 用户名 -->
        <param-name>loginUsername</param-name>
        <param-value>druid</param-value>
    </init-param>
    <init-param>
        <!-- 密码 -->
        <param-name>loginPassword</param-name>
        <param-value>druid123</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>DruidStatView</servlet-name>
    <url-pattern>/druid/*</url-pattern>
</servlet-mapping>

5. 访问统计页面

http://127.0.0.1:8080/xxxx/druid/index.html