beans.xml
<?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-3.0.xsd
http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
         http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <!-- a service object; we will be profiling its methods -->
    <context:annotation-config />
    <context:component-scan base-package="com.bebig" />

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        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}" />
    </bean>
    <context:property-placeholder location="classpath:jdbc.properties" />

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="annotatedClasses">
            <list>
                <value>com.bebig.model.User</value>
                <value>com.bebig.model.Log</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
<!--                <prop key="hibernate.current_session_context_class">thread</prop>-->
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
    </bean>
    
    <bean id="transactionManager" 
            class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
  </bean>
  <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>
UserService.java
package com.bebig.service;

import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.bebig.dao.LogDAO;
import com.bebig.dao.UserDAO;
import com.bebig.model.Log;
import com.bebig.model.User;

@Service("userService")
public class UserService {
    private UserDAO userDAO;
    private LogDAO logDAO;

    public LogDAO getLogDAO() {
        return logDAO;
    }

    @Resource
    public void setLogDAO(LogDAO logDAO) {
        this.logDAO = logDAO;
    }

    @Transactional//事务注解
    public void add(User u) {
        userDAO.save(u);
        Log l = new Log();
        l.setMsg("a user saved!");
        logDAO.save(l);
    }

    @Resource
    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }

    public UserDAO getUserDAO() {
        return userDAO;
    }

    public void init() {
        System.out.println("init.");
    }

    public void destory() {
        System.out.println("destory.");
    }
}