spring 的 Dao层+Service层+Action层的初使用，为什么用spring

spring 的 Dao层+Service层+Action层的初使用，为什么用spring

1.Dao层：(分为接口与Implement)

package com.myget;

public interface PersonDao {

public void add();

}

+

package com.myget;

import javax.annotation.Resource;

import org.springframework.stereotype.Repository;

@Repository("personDao")     //  相当于<bean    id="personDao" class="com.myget.PersonDaoImplement" />
public class PersonDaoImplement implements PersonDao {
public void add(){

System.out.println("Dao层的add方法");

}
}

2.Service层：(接口与implement)

package com.myget;

public interface ServiceInterface {

public void add();

}

+

package com.myget;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

@Service("serviceImplement")   //<bean  id="serviceImplement" class="com.myget.ServiceImplement"  />
public class ServiceImplement implements ServiceInterface{
public PersonDao personDao;

/* @Resource(name="personDao")     //引入id为personDao的 personDaoImplement类  <bean id="serviceImplement" class="com.myget.ServiceImplement">      <property name="personDao"  ref=‘personDao”> </bean>

public PersonDao personDao;

public PersonDao getPersonDao(){        //相当于getter方法   跟 下面的setter方法功能差不多啊 赶脚   

return personDao;

}*/

@Resource(name="personDao")
public void setPersonDao(PersonDao personDao){
this.personDao=personDao;
}


public void add(){


System.out.println("service层的add方法");

personDao.add();

}

}

3.Action层（类的getter方法与setter方法，选一个）

package com.myget;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;

@Controller("actionExample")   //相当于<bean id="actionExample" class="com.myget.ActionExample" />
public class ActionExample {

@Resource(name="serviceImplement")  //相当于在bean中引用了id为serviceImplement的bean   <bean id="serviceImplement" class="com.myget.ActionExample"><property name="serviceImplement" ref="serviceImplement"></bean>

public ServiceInterface serviceInterface;


public ServiceInterface getServiceInterface(){   //
return serviceInterface;
}

/* @Resource(name="serviceImplement")
public void setServiceInterface(ServiceInterface serviceInterface){
this.serviceInterface=serviceInterface;

}*/

public void addadd(){

serviceInterface.add();//调用Dao层与Service层的add方法
System.out.println("action层的addadd方法");
}

}

4.最后

调用ApplicationContext:

package com.myget;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyResult {

public static void main(String[] args){


ApplicationContext applicationContext = new ClassPathXmlApplicationContext("Example.xml");


ActionExample actionExample=(ActionExample)applicationContext.getBean("actionExample");

actionExample.addadd();



}

}