数据库连接池相关配置。 c3p0,tomcat jdbc,druid

c3p0

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="${driverClassName}"></property>
<property name="jdbcUrl" value="${url}"></property>
<property name="user" value="${username}"></property>
<property name="password" value="${password}"></property>
<property name="maxPoolSize" value="40"></property>
<property name="minPoolSize" value="1"></property>
<property name="initialPoolSize" value="1"></property>
<property name="maxIdleTime" value="20"></property>
</bean>

 pom.xml

<dependency>   <groupId>c3p0</groupId>   <artifactId>c3p0</artifactId>   <version>0.9.1.2</version></dependency>

tomcat jdbc

<!-- tomcat jdbc 数据源 -->

<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close">   <property name="driverClassName" value="${driverClassName}" />   <property name="url" value="${url}" />   <property name="username" value="${username}" />   <property name="password" value="${password}" />   <property name="validationQuery" value="${validationQuery}" />    <property name="testWhileIdle" value="true" />     <property name="testOnBorrow" value="true" />     <property name="testOnReturn" value="false" />     <property name="validationInterval" value="30000" />  

<!-- 运行"检查已经超时/废弃的连接"的线程频率(毫秒/次),默认为5000/5秒 -->    <property name="timeBetweenEvictionRunsMillis" value="30000" />  

<!-- 同一时间可从连接池中分配的最大连接数 -->    <property name="maxActive" value="40" />     <property name="minIdle" value="2" /> 

 <!-- 连接池中应保持的最大连接数 -->     <property name="maxIdle" value="40" />    <property name="maxWait" value="10000" />     <property name="initialSize" value="4" />     <property name="removeAbandonedTimeout" value="60" />     <property name="removeAbandoned" value="true" />     <property name="logAbandoned" value="true" />  

  <!-- 连接超时的最小时间(单位:毫秒,默认为60000/60秒) -->     <property name="minEvictableIdleTimeMillis" value="30000" />     <property name="jmxEnabled" value="true" />  </bean> 

pom.xml

<dependency>      <groupId>org.apache.tomcat</groupId>      <artifactId>tomcat-jdbc</artifactId>      <version>7.0.29</version>  </dependency>  <dependency>      <groupId>org.apache.tomcat</groupId>      <artifactId>tomcat-juli</artifactId>      <version>7.0.29</version>  </dependency>  
参考：http://rayoo.iteye.com/blog/1980973

druid配置

参考：https://github.com/alibaba/druid/wiki/%E5%B8%B8%E8%A7%81%E9%97%AE%E9%A2%98

1.导入jar包<dependency>    <groupId>com.alibaba</groupId>    <artifactId>druid</artifactId>    <version>1.1.6</version></dependency>2.替换原连接池配置,spring-hibernate.xml 配置文件中,将原dataSource配置替换为以下配置:<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"     init-method="init" destroy-method="close">   <property name="driverClassName" value="${driverClassName}" />   <property name="url" value="${url}" />   <property name="username" value="${username}" />   <property name="password" value="${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" />   <!-- 配置获取连接等待超时的时间 -->   <property name="maxWait" value="10000" />   <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->   <property name="timeBetweenEvictionRunsMillis" value="60000" />   <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->   <property name="minEvictableIdleTimeMillis" value="300000" />   <!-- 验证连接有效与否的SQL，不同的数据配置不同 -->   <property name="validationQuery" value="${validationQuery}" />   <property name="testWhileIdle" value="true" />   <!-- 这里建议配置为TRUE，防止取到的连接不可用 -->   <property name="testOnBorrow" value="true" />   <property name="testOnReturn" value="false" />   <!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->   <property name="poolPreparedStatements" value="true" />   <property name="maxPoolPreparedStatementPerConnectionSize"           value="20" />   <property name="proxyFilters">      <list>         <ref bean="statFilter"/>         <ref bean="logFilter"/>      </list>   </property></bean><bean id="logFilter" class="com.alibaba.druid.filter.logging.Slf4jLogFilter"><!-- 是否记录执行的sql语句 -->   <property name="statementExecutableSqlLogEnable" value="false" /></bean><!-- 慢SQL记录 --><bean id="statFilter" class="com.alibaba.druid.filter.stat.StatFilter">   <!-- 慢sql时间设置,即执行时间大于200毫秒的都是慢sql -->   <property name="slowSqlMillis" value="200"/><!-- 是否记录慢sql语句，如果只是替换连接池，则改为false即可 -->   <property name="logSlowSql" value="true"/> </bean>如果只是替换连接池，以下步骤可省略3.配置切面开启spring关联监控,spring-hibernate.xml中配置切面(根据项目实际路径配置)<!-- druid spring monitor setting --><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.xxxx.项目名.service.*</value><value>com.xxxx.项目名.dao.*</value></list></property></bean><aop:config><aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut"/></aop:config>4.在web.xml中配置开启druid监控.druid监控页面用户名,密码<servlet>  <servlet-name>DruidStatView</servlet-name>  <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>  <init-param>    <!-- 允许清空统计数据 -->    <param-name>resetEnable</param-name>    <param-value>true</param-value>  </init-param>  <init-param>    <!-- 用户名 -->    <param-name>loginUsername</param-name>    <param-value>用户名</param-value>  </init-param>  <init-param>    <!-- 密码 -->    <param-name>loginPassword</param-name>    <param-value>密码</param-value>  </init-param></servlet><!-- 监控页面访问路径,自行配置 --><servlet-mapping>  <servlet-name>DruidStatView</servlet-name>  <url-pattern>/druid/*</url-pattern></servlet-mapping><filter>  <filter-name>druidWebStatFilter</filter-name>  <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>  <!-- 不需要加入监控的文件 -->  <init-param>    <param-name>exclusions</param-name>    <param-value>/public/*,*.js,*.css,/druid*,*.jsp,*.swf,*.html</param-value>  </init-param>  <init-param>    <param-name>principalSessionName</param-name>    <param-value>sessionInfo</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>5.security.xml中配置例外,不经过权限校验,pattern为DruidStatView 配置的访问路径<!-- ### 配置例外 ### --><security:filter-chain pattern="/druid/**" filters="none" />6.  配置日志文件,记录慢sql# Druidlog4j.appender.druid=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.druid.layout=org.apache.log4j.PatternLayoutlog4j.appender.druid.layout.ConversionPattern= [%d{HH\:mm\:ss}] %c{1} - %m%nlog4j.appender.druid.datePattern='.'yyyy-MM-ddlog4j.appender.druid.Threshold = WARNlog4j.appender.druid.append=truelog4j.appender.druid.File=druid-sql.log7.  配置完成后,启动项目,访问http://localhost:8080/项目名/druid 配置的访问路径