EJB3.0 draft学习笔记(1)

EJB3.0 draft学习笔记(1)

今天开始学习EJB3.0 draft，大家可能都知道了，一个有状态会话bean长得象这样：
@Stateful public class CartBean implements ShoppingCart {
private float total;
private Vector productCodes;
public int someShoppingMethod(){...};
...
ejbRemove() {...};
}
其它类型的我就不用说了吧...

规范中对entity bean的接口没有做具体规定，但sesseion bean 和MDB肯定是有个接口的。
一个bean类可以实现一个或多个接口：
/*
* The bean class implements the Calculator business interface:
*/
@Stateless public class CalculatorBean implements Calculator {
public float add (int a, int b) {
return a + b;
}
public float subtract (int a, int b) {
return a - b;
}
}
public interface Calculator {
public float add (int a, int b);
public float subtract (int a, int b);
}
如果没有实现接口，则会自动为它产生接口：
/*
* This class definition causes the Calculator
* interface to be generated as a local business interface.
* This interface will have the methods add and subtract.
*/
@Stateless public class CalculatorBean {
public float add (int a, int b) {
return a + b;
}
Enterprise Bean Class and Business Interface Enterprise JavaBeans 3.0, Early Draft

Exceptions
Sun Microsystems Inc.
public float subtract (int a, int b) {
return a - b;
}
}
产生的接口是什么名称呢？肯定是要规定的罗。根据bean类的名称来决定接口的名称。

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