簡單瀏覽器服務(wù)器三層架構(gòu)畢業(yè)設(shè)計外文翻譯(完整版)
【正文】 )： User Interface(UI) is located in the outermost layer (the top), from the user recently. Used to display data and receive data entered by the user, to provide users with an interactive interface to operate. Business Logic Layer(BLL)： Business Logic Layer system architecture is reflected in some of the core values. It concerns mainly concentrated in the formulation of business rules, business processes and business needs to achieve, such as the system design, In other words it 4 is to deal with the areas of systems (Domain) logic, and most of the time, the area known as the Business Logic Tier layer. Martin Fowler ivided the whole structure into three main layers: the presentation Layer, the field layer and the data source layer. As a pioneer in the fielddriven design Eric Evans, of the Business Logic Tier division made a more detailed breakdown for the application layer and the field level, through the stratification to further the field of logic and the area of separation logic solutions. Business Logic Tier structure in the system the location of a key, it is data access layer and said intermediate layer, the data exchange has played a role in connecting. As the layer is a weakcoupling structure between the three levels down the dependence on the bottom to the top is ignorant
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