public interface IPersonService {

 public abstract void Save();

}

public class PersonDaoBean implements IPersonDao {

 
 public void add(){
  System.out.println("这是personDaoBean的Add()方法");
 }
}

public class PersonServiceBean implements IPersonService {

 private IPersonDao iPersonDao;
 
 public IPersonDao getIPersonDao() {
  return iPersonDao;
 }

 public void setIPersonDao(IPersonDao personDao) {
  iPersonDao = personDao;
 }

 public void Save(){
  iPersonDao.add();
 }
 
 
}

<bean id="personDaoBean" class="cn.itcast.dao.impl.PersonDaoBean"></bean>
 <bean id="personService"
  class="cn.itcast.service.impl.PersonServiceBean">
  <property name="IPersonDao" ref="personDaoBean"></property>
  </bean>
  

public void instanceSpring() {
  ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(
    "beans.xml");
  IPersonService ipersonService = (IPersonService) ctx
    .getBean("personService");
  ipersonService.Save();
  ctx.close();
  // ctx.registerShutdownHook();

 }

输出：这是personDaoBean的Add()方法