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");          }   }