发布于 2016-08-02 07:47:52 | 61 次阅读 | 评论: 0 | 来源: 网友投递

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Spring Framework 开源j2ee框架

Spring是什么呢?首先它是一个开源的项目,而且目前非常活跃;它是一个基于IOC和AOP的构架多层j2ee系统的框架,但它不强迫你必须在每一层 中必须使用Spring,因为它模块化的很好,允许你根据自己的需要选择使用它的某一个模块;它实现了很优雅的MVC,对不同的数据访问技术提供了统一的接口,采用IOC使得可以很容易的实现bean的装配,提供了简洁的AOP并据此实现Transcation Managment,等等


这篇文章主要为大家详细介绍了Spring配置事务的五种方式,感兴趣的小伙伴们可以参考一下

Spring配置文件中关于事务配置总是由三个组成部分,分别是 DataSource 、TransactionManager  和 代理机制 这三部分,无论哪种配置方式,一般变化的只是代理机制这部分。

DataSource、TransactionManager这两部分只是会根据数据访问方式有所变化,比如使用Hibernate进行数据访问时,DataSource实际为SessionFactory,TransactionManager的实现为HibernateTransactionManager。

具体如下图:

根据代理机制的不同,总结了五种Spring事务的配置方式,配置文件如下:

第一种方式:每个Bean都有一个代理


<?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: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-2.5.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-2.5.xsd
 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> 
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
<property name="configLocation" value="classpath:hibernate.cfg.xml" /> 
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" /> 
</bean> 
<!-- 定义事务管理器(声明式的事务) --> 
<bean id="transactionManager"
  class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
<!-- 配置DAO --> 
<bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
<bean id="userDao"
  class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> 
<!-- 配置事务管理器 --> 
<property name="transactionManager" ref="transactionManager" /> 
<property name="target" ref="userDaoTarget" /> 
<property name="proxyInterfaces" value="com.bluesky.spring.dao.GeneratorDao" /> 
<!-- 配置事务属性 --> 
<property name="transactionAttributes"> 
<props> 
<prop key="*">PROPAGATION_REQUIRED</prop> 
</props> 
</property> 
</bean> 
</beans>

第二种方式:所有Bean共享一个代理基类


<?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: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-2.5.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-2.5.xsd
 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> 
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
<property name="configLocation" value="classpath:hibernate.cfg.xml" /> 
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" /> 
</bean> 
<!-- 定义事务管理器(声明式的事务) --> 
<bean id="transactionManager"
  class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
<bean id="transactionBase"
   class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
   lazy-init="true" abstract="true"> 
<!-- 配置事务管理器 --> 
<property name="transactionManager" ref="transactionManager" /> 
<!-- 配置事务属性 --> 
<property name="transactionAttributes"> 
<props> 
<prop key="*">PROPAGATION_REQUIRED</prop> 
</props> 
</property> 
</bean> 
<!-- 配置DAO --> 
<bean id="userDaoTarget" class="com.bluesky.spring.dao.UserDaoImpl"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
<bean id="userDao" parent="transactionBase" > 
<property name="target" ref="userDaoTarget" /> 
</bean> 
</beans>

第三种方式:使用拦截器


<?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: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-2.5.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-2.5.xsd
 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"> 
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
<property name="configLocation" value="classpath:hibernate.cfg.xml" /> 
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" /> 
</bean> 
<!-- 定义事务管理器(声明式的事务) --> 
<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" /> 
<!-- 配置事务属性 --> 
<property name="transactionAttributes"> 
<props> 
<prop key="*">PROPAGATION_REQUIRED</prop> 
</props> 
</property> 
</bean> 
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> 
<property name="beanNames"> 
<list> 
<value>*Dao</value> 
</list> 
</property> 
<property name="interceptorNames"> 
<list> 
<value>transactionInterceptor</value> 
</list> 
</property> 
</bean> 
<!-- 配置DAO --> 
<bean id="userDao" class="com.bluesky.spring.dao.UserDaoImpl"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
</beans>

第四种方式:使用tx标签配置的拦截器


<?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:context="http://www.springframework.org/schema/context"
 xmlns:aop="http://www.springframework.org/schema/aop"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-2.5.xsd
 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> 
<context:annotation-config /> 
<context:component-scan base-package="com.bluesky" /> 
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
<property name="configLocation" value="classpath:hibernate.cfg.xml" /> 
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" /> 
</bean> 
<!-- 定义事务管理器(声明式的事务) --> 
<bean id="transactionManager"
  class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
<tx:advice id="txAdvice" transaction-manager="transactionManager"> 
<tx:attributes> 
<tx:method name="*" propagation="REQUIRED" /> 
</tx:attributes> 
</tx:advice> 
<aop:config> 
<aop:pointcut id="interceptorPointCuts"
   expression="execution(* com.bluesky.spring.dao.*.*(..))" /> 
<aop:advisor advice-ref="txAdvice"
   pointcut-ref="interceptorPointCuts" /> 
</aop:config> 
</beans>

第五种方式:全注解


<?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:context="http://www.springframework.org/schema/context"
 xmlns:aop="http://www.springframework.org/schema/aop"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-2.5.xsd
 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> 
<context:annotation-config /> 
<context:component-scan base-package="com.bluesky" /> 
<tx:annotation-driven transaction-manager="transactionManager"/> 
<bean id="sessionFactory"
   class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
<property name="configLocation" value="classpath:hibernate.cfg.xml" /> 
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" /> 
</bean> 
<!-- 定义事务管理器(声明式的事务) --> 
<bean id="transactionManager"
  class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 
<property name="sessionFactory" ref="sessionFactory" /> 
</bean> 
</beans>

此时在DAO上需加上@Transactional注解,如下:


package com.mktao.spring.dao; 
import java.util.List; 
import org.hibernate.SessionFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.orm.hibernate3.support.HibernateDaoSupport; 
import org.springframework.stereotype.Component; 
import com.bluesky.spring.domain.User; 
@Transactional
@Component("userDao") 
public class UserDaoImpl extends HibernateDaoSupport implements UserDao { 
public List<User> listUsers() { 
return this.getSession().createQuery("from User").list(); 
 } 
... 
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持phperz。



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