如何使用spring aop自动设置创建日期

我一直在用java+maven+spring+hibernate开发一个项目,我想在调用saveorupdate之前自动将当前日期分配给pojo。我不介意创造 new Date()

//DateSetter.java
package org.personal.myproject.model;

import java.util.Date;
//this is how i'm getting the current date
public interface DateSetter {

   public Date getCurrentDate();

}


//DateCreatedDateSetterImpl.java
package org.personal.myproject.model;

import java.util.Date;
// the implementation
public class DateCreatedDateSetterImpl implements DateSetter {

  public Date getCurrentDate() {
    return new Date();
  }

}

//DateIntroduction.java
package org.personal.myproject.model;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.DeclareParents;

@Aspect
public class DateIntroduction {
    //making all the model implementors of the DateSetter interface
    @DeclareParents(value="org.personal.myproject.model.*",
    defaultImpl=DateCreatedDateSetterImpll.class)
    public DateSetter dateSetter;

    /**here is to add my "before trigger" for every calling of every method.
       if you can see i have the daos in 2 packages, i don't know whether is wrong or         not.i'm actually using the generic Dao so should i use that interface instead?
    **/
    @Before("execution * org.personal.myproject.dao.hibernate.*.(..) || *    org.personal.myproject.dao.hibernate.*.*.(..)" + "&& this(dateSetter)")
    public void injectLastModifiedDate(DateSetter dateSetter){
      /**so here i'm expecting to inject the new date but apparently i'm missing something**/
    }
}

有人能告诉我我做错了什么吗?或者这是他实现我梦想的错误方式好的。谢谢为了阅读