1.Spring AOP实现原理
- aop实现原理其实是java动态代理,但是jdk的动态代理只支持接口代理,所以spring的aop是用cglib这个库实现的,cglib使用了asm这个直接操纵字节码的框架,所以可以做到不实现接口的情况下完成动态代理。
- 面向切面编程,把散落在程序中的公共部分提取出来,做成切面类,这样的好处在于,代码的可重用,一旦涉及到该功能的需求发生变化,只要修改该代码就行,否则,你要到处修改,如果只要修改1、2处那还可以接受,万一有1000处呢。
AOP底层的东西就是JDK动态代理和CGLIB代理,说白了就是增强类的功能。
最常用的AOP应用在数据库连接以及事务处理上。
2.Spring IOC
- 含义:IOC就是控制反转,也就是应用程序本身不负责他依赖的对象的创建和管理,而是把它依赖的对象的创建和管理转交给外部容器,(获得依赖对象的过程由自身管理变成容器主动注入)(IOC容器中所有的对象都称为bean)
- 实现方式:
IOC目的:IOC容器负责创建对象和对象关系的组装
原理:反射
3.Spring如何管理事务的?
4.Spring配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="jdbcUrl">
<value>jdbc:mysql://localhost:3306/eportal?useUnicode=
true&characterEncoding=gbk</value>
</property>
<property name="user">
<value>root</value>
</property>
<property name="password">
<value>root</value>
</property>
<property name="maxPoolSize">
<value>20</value>
</property>
<property name="minPoolSize">
<value>2</value>
</property>
<property name="initialPoolSize">
<value>2</value>
</property>
<property name="maxIdleTime">
<value>20</value>
</property>
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.
hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mappingResources">
<list>
<value>com/eportal/ORM/News.hbm.xml</value>
<value>com/eportal/ORM/Category.hbm.xml</value>
<value>com/eportal/ORM/Memberlevel.hbm.xml</value>
<value>com/eportal/ORM/Cart.hbm.xml</value>
<value>com/eportal/ORM/Traffic.hbm.xml</value>
<value>com/eportal/ORM/Newsrule.hbm.xml</value>
<value>com/eportal/ORM/Merchandise.hbm.xml</value>
<value>com/eportal/ORM/Admin.hbm.xml</value>
<value>com/eportal/ORM/Orders.hbm.xml</value>
<value>com/eportal/ORM/Cartselectedmer.hbm.xml</value>
<value>com/eportal/ORM/Newscolumns.hbm.xml</value>
<value>com/eportal/ORM/Member.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="show_sql">true</prop>
<prop key="hibernate.jdbc.batch_size">50</prop>
<prop key="show_sql">50</prop>
</props>
</property>
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager" ref="transactionManager" />
<property name="transactionAttributes">
<props>
<prop key="browse*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="list*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="is*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<bean
class="org.springframework.aop.framework.autoproxy.
BeanNameAutoProxyCreator">
<property name="beanNames">
<list>
<value>adminService</value>
<value>columnsService</value>
<value>newsService</value>
<value>crawlService</value>
<value>memberLevelService</value>
<value>memberService</value>
<value>categoryService</value>
<value>merService</value>
<value>cartService</value>
<value>ordersService</value>
<value>trafficService</value>
</list>
</property>
<property name="proxyTargetClass">
<value>true</value>
</property>
<property name="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean>
<bean id="dao" class="com.eportal.DAO.BaseDAOImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<bean id="adminService" class="com.eportal.service.AdminServiceImpl">
<property name="dao" ref="dao" />
</bean>
<bean id="columnsService" class="com.eportal.service.ColumnsServiceImpl">
<property name="dao" ref="dao" />
</bean>
<bean id="ordersService" class="com.eportal.service.OrderServiceImpl">
<property name="dao" ref="dao" />
</bean>
<bean id="trafficService" class="com.eportal.service.TrafficServiceImpl">
<property name="dao" ref="dao" />
</bean>
<bean id="adminAction" class="com.eportal.struts.action.
AdminAction"
scope="prototype">
<property name="service" ref="adminService" />
</bean>
<bean id="columnsAction" class="com.eportal.struts.action.
ColumnsAction"
scope="prototype">
<property name="service" ref="columnsService" />
</bean>
<bean id="newsAction" class="com.eportal.struts.action.
NewsAction"
scope="prototype">
<property name="service" ref="newsService" />
<property name="columnsService" ref="columnsService" />
</bean>
<bean id="crawlAction" class="com.eportal.struts.action.
CrawlAction"
scope="prototype">
<property name="service" ref="crawlService" />
<property name="columnsService" ref="columnsService" />
</bean>
</beans>