druid连接池技术

druid：

1.导入jar包，

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.28</version>
</dependency>
2、属性文件:application.properties(DataSource连接参数)
jdbc.driverClassName=com.mysql.jdbc.Driver
#jdbc.url=jdbc:mysql://127.0.0.1:3308/logistics?useUnicode\=true&characterEncoding\=UTF-8
#jdbc.username=root
#jdbc.password=root

jdbc.url=jdbc:mysql://test.hjw.com:3306/logistics?useUnicode\=true&characterEncoding\=UTF-8
jdbc.username=test
jdbc.password=test123456

druid.pool.size.max=20
druid.pool.size.min=3
druid.pool.size.init=3
 
3、SPRING配置文件：
<!--1、配置数据库相关参数 -->
<context:property-placeholder location="classpath:jdbc.properties"
ignore-unresolvable="true" />
<!--2.数据源druid -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />


<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize" value="${druid.pool.size.init}" />
<property name="minIdle" value="${druid.pool.size.min}" />
<property name="maxActive" value="${druid.pool.size.max}" />
<!-- 配置监控统计拦截的filters，wall用于防止sql注入，stat用于统计分析 -->
<property name="filters" value="wall,stat" />
</bean>

<!--3、配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--注入数据库连接池 -->
<property name="dataSource" ref="dataSource" />
<!--扫描sql配置文件:mapper需要的xml文件 -->
<property name="mapperLocations" value="classpath:mapper/*.xml" />
<property name="typeAliasesPackage" value="com.isea533.ssm.model" />
<property name="plugins">
<array>
<bean class="com.github.pagehelper.PageHelper">
<property name="properties">
<value>
dialect=mysql
</value>
</property>
</bean>
<bean class="com.fumao.logistics.util.mybatis.MapInterceptor" />
</array>
</property>
</bean>

<!--4、配置扫描Dao接口包,动态实现DAO接口,注入到spring容器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--注入SqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<!-- 给出需要扫描的Dao接口 -->
<property name="basePackage" value="com.fumao.logistics.dao" />
</bean>
</beans>




4.监控方式
1、WEB方式监控配置web.xml
<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> 
 <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>/public/*,*.js,*.css,/druid*,*.jsp,*.swf</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>