一个spring管理hibernate事务的问题？？？

以前用hibernate+struts实现了一个简单的发贴功能，现在想用spring的aop来管理事务：
我使用spring的源代码如下：
~~~~~DAO~~~~~~~~~~
public interface IPostDAO {
public void savePost(Post post);
public Post[] getAllPosts();
public Post getPostById(Integer id);

}


public class PostDAO  extends HibernateDaoSupportimplements IPostDAO{
public PostDAO() {
    super(); }
public void savePost(Post post){  
getHibernateTemplate().saveOrUpdate(post);
}  
public Post getPostById(Integer id) {
   Post post=null;  
   return (Post)getHibernateTemplate().get(Post.class, id);
   }
public Post[] getAllPosts(){
List result = new ArrayList();
result=getHibernateTemplate().find("from Post");
Post[] posts = new Post[result.size()];
result.toArray(posts);
return posts;
}
}
 
IUserDAO和UserDAO类似（不列出了）
~~~~~~~~~~~~~Service~~~~~~~~~~~~~~~~~~~~~~
public interface IPostService {
public void savePost(PostDTO postdto);
public List  getAllPosts();
public void setUserdao(UserDAO userdao);

}

public class PostService implements IPostService {
public PostService() {
  }
private PostDAO postdao;
private UserDAO userdao;
public void setPostdao(PostDAO postdao) {
this.postdao = postdao;
}
public void setUserdao(UserDAO userdao) {
this.userdao = userdao;
}
    public void savePost(PostDTO postdto){
        try {
            Post post=new Post();
            post.setPTitle(postdto.getPTitle());
            post.setPContent(postdto.getPContent());
            post.setPTime(postdto.getPTime());
            User user=new User();   
            user=userdao.getUserById(new Integer(postdto.getUId()));
            post.setUser(user);
            postdao.savePost(post);
        } catch (RuntimeException e) {
            throw new RuntimeException("aa"+e.toString());
        } 
    }
    public List getAllPosts(){
        try {
            List list=new ArrayList();
            Post[] posts =postdao.getAllPosts();
            if(posts!=null&&posts.length>0){
                for(int i=0;i<posts.length;i++){
            PostDTO postdto=new PostDTO();
            postdto.setPTitle(posts[i].getPTitle());
            postdto.setPContent(posts[i].getPContent());
            postdto.setPTime(posts[i].getPTime());
            list.add(postdto);
            }
            }
            return list;
        } catch (RuntimeException e) {
            throw new RuntimeException(e.getMessage()+"postservice you wen ti!!" );
        }
    }
}

~~~~~~~~~~~~~~~~配置文件~~~~~~~~~~~~~~~~~~~~~~~~
<?xml version="1.0" encoding="GB2312"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName">
<value>org.gjt.mm.mysql.Driver</value>
</property>
<property name="url">
<value>jdbc:mysql://localhost/cus</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value></value>
</property>
</bean>
<bean id="mySessionFactory"
class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
<property name="dataSource">
<ref local="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>User.hbm.xml</value>
<value>Post.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
net.sf.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">
true
</prop>
</props>
</property>
</bean>
<bean id="myTransactionManager"
         class="org.springframework.orm.hibernate.HibernateTransactionManager">
  <property name="sessionFactory">
    <ref local="mySessionFactory"/>
  </property>
  </bean>
<!-- ORDER SERVICE -->
<bean id="postService"
  class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
  <property name="transactionManager">
    <ref local="myTransactionManager"/>
  </property>
  <property name="target">
    <ref local="postTarget"/>
  </property>
  <property name="transactionAttributes">
    <props>
      <prop key="save*">
     PROPAGATION_REQUIRED
      </prop>
      <prop key="get*">
     PROPAGATION_REQUIRED
      </prop>
    </props>
  </property>
</bean>
 
<!-- ORDER TARGET PRIMARY BUSINESS OBJECT:
Hibernate implementation -->
<bean id="postTarget"
         class="service.PostService">
  <property name="postdao">
    <ref local="postdao"/>
  </property>
  <property name="userdao">
    <ref local="userdao"/>
  </property>
</bean>
<!-- ORDER DAO OBJECT -->
<bean id="userdao"  class="dao.UserDAO">
  <property name="sessionFactory">
  <ref local="mySessionFactory"/>
  </property>
</bean>
<bean id="postdao"  class="dao.PostDAO">
<property name="sessionFactory">
<ref local="mySessionFactory"/>
  </property>
</bean>
</beans>
配置是不是有错啊？？？，我一运行service里得到的总是空！不知道为什么？？？？
以前我用hibernate.cfg.xml去配置的数据源的。如果我想保留hibernate.cfg.xml这个配置应该怎么写啊？？
请多多指教！

可以自己写个工厂类，生成servcie实例

在你的action里边调用，拿到实例

好难看阿，这些代码。。。晕

你把代码打包发上来看看。