在下面的代码中,Mediator中对EJB机制的压缩以及将EJB方法作为Mediator的方法,可以在jsp中使用 Mediator。Mediator通常由你自己根据个人需要编写。Mediator可以提供附加的值如attribute caching等.
<%@ page import="javax.naming.*, javax.rmi.PortableRemoteObject,
foo.AccountHome, foo.Account" %>
<%!
//declare a "global" reference to an instance of the home interface of the session bean
AccountHome accHome=null;
public void jspInit() {
//obtain an instance of the home interface
InitialContext cntxt = new InitialContext( );
Object ref= cntxt.lookup("java:comp/env/ejb/AccountEJB");
accHome = (AccountHome)PortableRemoteObject.narrow(ref,AccountHome.class);
}
%>
<%
//instantiate the session bean
Account acct = accHome.create();
//invoke the remote methods
acct.doWhatever(...);
// etc etc...
%>
<%@ page import="javax.naming.*, javax.rmi.PortableRemoteObject,
foo.AccountHome, foo.Account" %>
<%!
//declare a "global" reference to an instance of the home interface of the session bean
AccountHome accHome=null;
public void jspInit() {
//obtain an instance of the home interface
InitialContext cntxt = new InitialContext( );
Object ref= cntxt.lookup("java:comp/env/ejb/AccountEJB");
accHome = (AccountHome)PortableRemoteObject.narrow(ref,AccountHome.class);
}
%>
<%
//instantiate the session bean
Account acct = accHome.create();
//invoke the remote methods
acct.doWhatever(...);
// etc etc...
%>
解决方案 »
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