spring

 

Public class Action{

public void execute(){

ICustomerDao icdao= DaoFactory.getCustomDao();

cdao.login();                   

}

}

 

 

 

public class DaoFactory{

public static ICustomDao getCustomDao(){

       return new CustomDao();

}

}

 

 

 

Public interface ICustomerDao{

public abstract  boolean login();

}

 

 

public class CustomerDao implements ICustomerDao{

 

            public Boolean login()  {/*代码*/}

}

 

这样做的好处：Action与CustomDao有什么直接关系。如有另一个类，也只要实现

 

ICustomerDao接口。修改一个new CustomDao();

 

 

 

 

 

=======================================

 

 

Public class Action{

public void execute(){

ICustomerDao icdao= (ICustomerDao)BeanFactory.getBean(“别名”);

cdao.login();                   

}

}

 

 

 

public class BeanFactory{//框架化

public static ObjectgetBean(String  aName){

String  className= 根据别名读取的类名；

return Class.forName(className).newInstance();

}

}

 

 上面aName是别名，className是类名

-------------设置配置文件，定义别名和类名的映射

在映射文件中只要修改类名，别名不变。

 

 

Public  interface ICustomerDao{

public abstract  boolean login();

}

 

 

public class CustomerDao implements ICustomerDao{

 

            public Boolean login()  {/*代码*/}

}