另外，此方法的可扩展性不如中间件代理方法，因为需要对每个J2EE 1.3客户机应用程序进行手动修改。
Also, this approach is not as scalable as the middleware proxy approach, because it requires manual modification of each J2EE 1.3 client application.
中间件代理方法的一个优势在于，不需要进行任何应用程序开发任务。
One advantage to the middleware proxy approach is that no application development tasks are required.
这种设计模式在中间层中引入了一个应用程序服务器，中间层代理客户端和数据层之间的代理。
This design pattern introduces an application server in the middle tier which brokers connections between clients and the data tier.
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