SpringMVC Druid鏈接池配置使用

    此次在項目中遇到了一個奇怪的問題, 就是在每隔一段時間訪問服務器就會報鏈接超時的錯誤,但在次請求就不會出現該問題,剛開始覺得是服務器那邊數據庫的問題,可是發現其餘項目中都沒有這種問題,因此查了好久發現原來是數據鏈接池這塊的相關參數根本沒有配置,這才致使出現的這樣的錯誤,耽擱的這麼長時間;都怪我太大意,因此寫下來這個錯誤,下次就不要在犯了;java

    這裏推薦一個很好用的數據鏈接池:mysql

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.29</version>
    </dependency>

string-mybatis.xml中相關配置:web

<?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:p="http://www.springframework.org/schema/p"
	   xmlns:tx="http://www.springframework.org/schema/tx"
	   xmlns:context="http://www.springframework.org/schema/context"
	   xmlns:aop="http://www.springframework.org/schema/aop"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd ">
    <context:component-scan base-package="com.xt.shop.base.service.impl" />
	<context:annotation-config />
	<tx:annotation-driven />

	<!-- 讀取JDBC的配置-->
	<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations" value="classpath:jdbc.properties"/>
	</bean>
	<!-- 配置數據源,從上面配置文件讀取-->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		
		<!--==============DRUID鏈接池相關配置==================-->
		
		<!--初始化時創建物理鏈接的個數-->
        <property name="initialSize" value="5"/>
		<!--最小鏈接池數量-->
        <property name="minIdle" value="10"/>
		<!--最大鏈接池數量-->
        <property name="maxActive" value="100"/>
		<!--鏈接時最大等待時間,單位毫秒-->
        <property name="maxWait" value="60000"/>
		<!--配置間隔多久才進行一次檢測,檢測須要關閉的空閒鏈接,單位是毫秒-->
        <property name="timeBetweenEvictionRunsMillis" value="60000"/>
		<!--配置一個鏈接在池中最小生存的時間,單位是毫秒-->
        <property name="minEvictableIdleTimeMillis" value="300000"/>
		<!--用來檢測鏈接是否有效的SQL,要求是一個查詢語句-->
        <property name="validationQuery" value="SELECT 1 FROM DUAL"/>
		<!--申請鏈接時執行 validationQuery 檢測鏈接是否有效,作了這個配置會下降性能-->
        <property name="testOnBorrow" value="true"/>
		<!--歸還鏈接時執行 validationQuery 檢測鏈接是否有效,作了這個配置會下降性能-->
        <property name="testOnReturn" value="true"/>
		<!--建議配置爲true,不影響性能,而且保證安全性;申請鏈接的時候檢測,若是空閒時間大於
			timeBetweenEvictionRunsMillis,執行 validationQuery 檢測鏈接是否有效-->
        <property name="testWhileIdle" value="true"/>
        <!--是否緩存preparedStatement,也就是 PSCache-->
        <property name="poolPreparedStatements" value="true"/>
        <!--指定每一個鏈接上 PSCache 的大小-->
        <property name="maxOpenPreparedStatements" value="20"/>
        <!-- 打開清除廢棄鏈接功能 -->  
        <property name = "removeAbandoned" value = "true"/>  
        <!--清除廢棄鏈接的超時時間-->
        <property name="removeAbandonedTimeout" value="1800"/>
        <!-- 關閉 清除 鏈接時輸出錯誤日誌 -->     
        <property name = "logAbandoned" value = "true"/> 
        <!--配置監控統計攔截的filters,屬性類型是字符串,經過別名的方式配置擴展插件,
        	經常使用的插件有:監控統計用的STAT;日誌用的log4j;防護SQL注入的wall-->
        <property name="filters" value="stat,wall,log4j"/>
        <!--經過 connectProperties 屬性來打開mergeSql功能;慢SQL記錄-->
        <property name="connectionProperties" value="druid.stat.merggSql=ture;druid.stat.slowSqlMillis=5000"/>
        <!--合併多個DruidDataSource的監控數據-->
        <property name="useGlobalDataSourceStat" value="true"/>
	</bean>
	
	<!-- MyBatis_Plus配置: -->
	<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<!-- 配置掃描實體的包路徑 -->
		<property name="typeAliasesPackage" value="com.xt.shop.base.entity"/>
		<!-- 配置掃描 MAPPER XML的位置 -->
		<property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"/>
		<!-- 配置 MyBatis配置文件的位置 -->
		<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
		<property name="globalConfig" ref="globalConfig"/>
		<!-- 配置插件 -->
		<property name="plugins">
            <array>
                <!-- 分頁插件配置 -->
                <bean id="paginationInterceptor" class="com.baomidou.mybatisplus.plugins.PaginationInterceptor">
                    <property name="dialectType" value="mysql"/>
                    <property name="optimizeType" value="aliDruid" />
                </bean>
            </array>
        </property>
	</bean>
	
    <!-- MP 全局配置注入 -->
    <bean id="globalConfig" class="com.baomidou.mybatisplus.entity.GlobalConfiguration">
        <property name="idType" value="0"/>
        <property name="dbColumnUnderline" value="true"/>
    </bean>
    
	<!-- 配置掃描MAPPER接口的包路徑 -->
	<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.xt.shop.base.mapper"/>
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
	</bean>
	
  	<!-- 事務處理  -->
    <bean id= "transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"/>
	</bean>
	
	<!-- 事務註解:開啓註解支持-->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
    
    <!-- 全局AOP事物,除get,list,select,query開頭的方法外,都處在事物當中  -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="select*" propagation="REQUIRED" read-only="true" />
			<tx:method name="get*" propagation="REQUIRED" read-only="true" />
			<tx:method name="list*" propagation="REQUIRED" read-only="true" />
			<tx:method name="query*" propagation="REQUIRED" read-only="true" />
			<tx:method name="*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception"/>
		</tx:attributes>
	</tx:advice>
	
	<!-- 配置事務切面 到Service層 -->
	<aop:config expose-proxy="true" proxy-target-class="true" >
		<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.xt.shop.base.service..*.*(..))"/>
	</aop:config>
  
</beans>

web.xml中相關配置:spring

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring/spring-mybatis.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <filter>
    <filter-name>SetCharacterEncoding</filter-name>
    	<filter-class>
			com.xt.shop.base.interceptor.SimpleCORSFilter
		</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>SetCharacterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>Spring MVC</servlet-name>
    <servlet-class>
			org.springframework.web.servlet.DispatcherServlet
		</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring/spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Spring MVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

    <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>/static/*,*.ico,/druid/*</param-value>
        </init-param>
        <init-param>
            <param-name>sessionStatEnable</param-name>
            <param-value>false</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>DruidWebStatFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--===================DRUID監控====================-->
    <servlet>
        <servlet-name>DruidStatView</servlet-name>
        <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
        <init-param>
            <!-- 用戶名 -->
            <param-name>loginUsername</param-name>
            <param-value>admin</param-value>
        </init-param>
        <init-param>
            <!-- 密碼 -->
            <param-name>loginPassword</param-name>
            <param-value>admin</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>DruidStatView</servlet-name>
        <url-pattern>/druid/*</url-pattern>
    </servlet-mapping>
</web-app>

這樣就能夠在該服務器下  /druid 中訪問 Druid 中攔截到的信息了;sql

參考: http://blog.csdn.net/hj7jay/article/details/51686418數據庫

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