Druid

Druid是阿里巴巴開源平臺上的一個專案，整個專案由資料庫連線池、外掛框架和SQL解析器組成。該專案主要是為了擴充套件JDBC的一些限制，可以讓程式設計師實現一些特殊的需求，比如向金鑰服務請求憑證、統計SQL資訊、SQL效能收集、SQL注入檢查、SQL翻譯等，程式設計師可以通過定製來實現自己需要的功能。

Maven引入jar包

        <dependency>  
                <groupId>com.alibaba</groupId>  
                <artifactId>
 
druid</artifactId>  
                <version>1.0.9</version>  
            </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.8</version>
 

        </dependency>

配置資料庫連線池

在ApplicationContext.xml檔案中新增下列配置
配置資料庫

<!-- 宣告屬性檔案 -->
    <context:property-placeholder location="classpath:mysql.properties" />
    <!-- 阿里 druid 資料庫連線池 -->  
    <bean id = "dataSource" class = "com.alibaba.druid.pool.DruidDataSource
 
" destroy-method = "close" >    
       <!-- 資料庫基本資訊配置 -->  
       <property name = "url" value = "jdbc:mysql://${mysql.host}:${mysql.port}/${mysql.dbname}?useUnicode=true&amp;characterEncoding=UTF-8&amp;zeroDateTimeBehavior=convertToNull" />    
       <property name = "username" value = "${mysql.username}" />    
       <property name = "password" value = "${mysql.password}" />    
       <property name = "driverClassName" value = "${driverClassName}" />    
       <property name = "filters" value = "${filters}" />    
        <!-- 最大併發連線數 -->  
       <property name = "maxActive" value = "${maxActive}" />  
       <!-- 初始化連線數量 -->  
       <property name = "initialSize" value = "${initialSize}" />  
       <!-- 配置獲取連線等待超時的時間 -->  
       <property name = "maxWait" value = "${maxWait}" />  
       <!-- 最小空閒連線數 -->  
       <property name = "minIdle" value = "${minIdle}" />    
       <!-- 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連線，單位是毫秒 -->  
       <property name = "timeBetweenEvictionRunsMillis" value ="${timeBetweenEvictionRunsMillis}" />  
       <!-- 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 ="${minEvictableIdleTimeMillis}" />    
<!--        <property name = "validationQuery" value = "${validationQuery}" />     -->
       <property name = "testWhileIdle" value = "${testWhileIdle}" />    
       <property name = "testOnBorrow" value = "${testOnBorrow}" />    
       <property name = "testOnReturn" value = "${testOnReturn}" />    
       <property name = "maxOpenPreparedStatements" value ="${maxOpenPreparedStatements}" />  
       <!-- 開啟 removeAbandoned 功能 -->  
       <property name = "removeAbandoned" value = "${removeAbandoned}" />  
       <!-- 1800 秒，也就是 30 分鐘 -->  
       <property name = "removeAbandonedTimeout" value ="${removeAbandonedTimeout}" />  
       <!-- 關閉 abanded 連線時輸出錯誤日誌 -->     
       <property name = "logAbandoned" value = "${logAbandoned}" /> 
       <property name="proxyFilters">
            <list>
                <ref bean="wall-filter"/>
                <ref bean="stat-filter"/>
                <ref bean="log-filter"/>
            </list>
        </property>
    </bean>  


    <!-- 慢SQL記錄 -->
    <bean id="stat-filter" class="com.alibaba.druid.filter.stat.StatFilter">
        <!-- 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="2000"/>
        <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>

    <!-- 防禦SQL攻擊 -->
    <bean id="wall-filter" class="com.alibaba.druid.wall.WallFilter">  
        <property name="config" ref="wall-config" />  
        <property name="logViolation" value="true" />  
<!--         <property name="throwException" value="false" />   -->
    </bean>  

    <bean id="wall-config" class="com.alibaba.druid.wall.WallConfig">  
        <property name="deleteAllow" value="false" />  
        <property name="truncateAllow" value="false" />  
        <property name="dropTableAllow" value="false" />  
        <property name="alterTableAllow" value="false" />  
        <property name="deleteWhereNoneCheck" value="false" />  
        <property name="updateWhereNoneCheck" value="false" />  

    </bean> 



    <!-- druid  spring監控   start -->
    <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.dekscom.db.dao.*</value>
            </list>
        </property>
    </bean>


    <!-- 建立基於類的代理 -->
    <aop:config proxy-target-class="true">
        <aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" />
    </aop:config>
    <!-- druid  spring監控   end -->

mysql.properties屬性檔案

mysql.host=localhost
mysql.port=3306
mysql.dbname=mysqldb
mysql.username=root
mysql.password=root
driverClassName: com.mysql.jdbc.Driver  
filters: wall,stat  
maxActive: 20  
initialSize: 3  
maxWait: 5000  
minIdle: 3  
maxIdle: 15  
timeBetweenEvictionRunsMillis: 60000  
minEvictableIdleTimeMillis: 300000  
validationQuery: SELECT 'x'  
testWhileIdle: true  
testOnBorrow: false  
testOnReturn: false  
maxOpenPreparedStatements: 20  
removeAbandoned: true  
removeAbandonedTimeout: 1800  
logAbandoned: true 

在web.xml檔案中新增下列配置

<!-- 連線池 啟用 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>  
        <init-param>  
        <!-- 使用者名稱 -->  
            <param-name>loginUsername</param-name>  
            <param-value>druid</param-value>  
        </init-param>  
        <init-param>  
        <!-- 密碼 -->  
        <param-name>loginPassword</param-name>  
        <param-value>druid</param-value>  
     </init-param>
      </servlet>  
      <servlet-mapping>  
         <servlet-name>DruidStatView</servlet-name>  
         <url-pattern>/druid/*</url-pattern>  
      </servlet-mapping>  
      <!-- 連線池 啟用 Web 監控統計功能    end--> 

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