Question

N-Tiered和N-Layered架构/设计意味着什么？

N-Tiered和N-Layered架构/设计之间有什么区别吗？

如果是，有什么区别？

Answer 1

人们经常互换使用这两个术语，因为他们可以将架构描述为多层次和多层次。我的看法是，层通常是指某种物理隔离，而层更多是逻辑分离。

例如，我会说一个典型的Web应用程序有一个前端 - 浏览器中显示的内容 - 以及在应用程序服务器上运行的实际应用程序逻辑和数据库。这可以称为3层，因为有数据库服务器，应用程序服务器和客户机。然而，同样可以轻松地引用数据库层，逻辑层和表示（或UI）层。

Answer 2

N层是指系统（即服务器和客户端）的“分布式”层，而n层是指自包含程序中的层;虽然这两者经常互换使用，但有些人认为存在显着差异（如我上面提到的那个），如维基百科上Multitier architecture和Multilayered architecture的第一段所示，解释了差异。 / p>

Answer 3

这个SCEA Study Notes解释了分层和分层架构之间的JEE差异

Java EE系统的层级

* Client (GUI and Web): GUI directly interacts with web tier. Web uses browser, applets to interact with web server through HTTP. Responsible for direct presentation and interaction with user.
* Web components: processes web requests. Acts as mediator between clients and business components.
* Business: (solves domain-specific) business problems. The abstract business logic processing happens in this tier.
* Integration and Resource: handles connectivity with data stores and other (legacy) systems.

Java EE系统的层

* Virtual platform (component APIs): used to implement/support business logic. API Components include: JavaBeans, Java Servlets, JavaServer Pages/Faces, Java Message Service API, Java Transaction API, etc.
* Application infrastructure (container): responsible for executing the application. Also provides services like: security, transactions, JNDI, and other connectivities.
* Enterprise services (OS): responsible for the execution environment of the application infrastructure. Provides computing time and access to (abstract) hardware.
* Compute and storage: the hardware or physical server. Provides computing power for the OS.
* Networking infrastructure: responsible for networking services.

N层与N层架构/设计

3 个答案: