/** This interface defines the 'home' interface for the 'Interest' EJB. */ public interface InterestHome extends EJBHome { /** Creates an instance of the `InterestBean' class on the server, and returns a remote reference to an Interest interface on the client. */ Interest create() throws RemoteException, CreateException; } 最后我们给出bean实现类，文件名称：InterestBean.java。代码如下：
/** This class contains the implementation for the 'calculateCompoundInterest' method exposed by this Bean. It includes empty method bodies for the methods prescribe by the SessionBean interface; these don't need to do anything in this simple example. */public class InterestBean implements SessionBean { /** Calulates the compound interest on the sum `principle', with interest rate per period `rate' over `periods' time periods. This method also prints a message to standard output; this is picked up by the EJB server and logged. In this way we can demonstrate that the method is actually being executed on the server, rather than the client. */ public double calculateCompoundInterest(double principle, double rate, double periods) { System.out.println("Someone called `calculateCompoundInterest!'"); return principle * Math.pow(1+rate, periods) - principle; } /** Empty method body */ public void ejbCreate() {} /** Every ejbCreate() method ALWAYS needs a corresponding ejbPostCreate() method with exactly the same parameter types. */ public void ejbPostCreate() {} /** Empty method body */ public void ejbRemove() {} /** Empty method body */ public void ejbActivate() {} /** Empty method body */ public void ejbPassivate() {} /** Empty method body */ public void setSessionContext(SessionContext sc) {}
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