发布于 2018-03-15 15:56:48 | 71 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


这篇文章主要介绍了Spring事务Transaction配置的五种注入方式详解,具有一定的参考价值,感兴趣的小伙伴们可以参考一下。

前段时间对spring的事务配置做了比较深入的研究,在此之间对Spring的事务配置虽说也配置过,但是一直没有一个清楚的认识。通过这次的学习发觉Spring的事务配置只要把思路理清,还是比较好掌握的。

总结如下:

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.bluesky.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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