Spring整理5 -- 模块的组装

 

如何实现三个模块良好的切换？

 

配置文件

<beans>

       <bean id="dao" class="dao.CustomerDao"></bean>

       <!-- 将dao装配到DaoCaller内dao属性 -->

       <bean id="caller" class="caller.DaoCaller">

              <property name="dao">

                     <ref local="dao"/>

              </property>

       </bean>

 

</beans>

程序

package dao;

 

public interface IDAO {

       public boolean login(String account,String password);

}

 

package dao;

 

public class StudentDao implements IDAO {

 

       public boolean login(String account, String password) {

              System.out.println("Student登陆，账号:" + account + " 密码:" + password);

              return false;

       }

}

 

package dao;

 

public class CustomerDao implements IDAO {

 

       public boolean login(String account, String password) {

              System.out.println("Customer登陆，账号:" + account + " 密码:" + password);

              return false;

       }

 

}

 

package caller;

 

import dao.IDAO;

 

public class DaoCaller {

       private IDAO dao;//设置成为一个属性

       public IDAO getDao() {

              return dao;

       }

       public void setDao(IDAO dao) {

              this.dao = dao;

       }

       public void callDao(String account,String password){

              dao.login(account, password);

       }

}

 

package main;

 

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

 

import caller.DaoCaller;

 

public class MainModule {

 

       public static void main(String[] args) {

              ApplicationContext context =

new FileSystemXmlApplicationContext("applicationContext.xml");

              DaoCaller caller = (DaoCaller)context.getBean("caller");

              caller.callDao("111", "34;gd");

 

       }

 

}