网上商城系统毕业设计外文翻译

毕业设计说明书英文文献及中文翻译

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指导教师：

1 Struts Framework Based on MVC

In the traditional Web application, Java Server Pages(JSP) pages are responsible for handling all things, for example, receiving requests, executing business logics, choosing the next page. Thes e complicated things may lead to chaos of JSP pages’ codes and be harmful for the extension and maintenance of pages. The Model-View-Controller (MVC) mode separates the programming codes into three different areas, which has solved the above problem. MVC can realize J2EE application system's stratification and the loose coupling of three layers or multilayer, and it is a realization way of orienting dynamic content. The MVC mode divides application into three core components of Model, View and Controller.

Struts is a realization of MVC. It is an open source Web application framework and uses Servlet and JSP marks that belong to the J2EE norm as a part of the realization. Struts inherits MVC characteristics and realizes some corresponding changes and extension according to J2EE traits. Struts separates Java codes of JSP by Java Bean and Action class to be the MVC mode, transmits data among the three partitions of Model, View and Controller, demonstrates the connection between various classes and JSP pages by configuration files finally and it intends to realize the separation of presentation layer, business layer and data layer. The Struts structure is shown in Figure 1.

The Model contains the business logic that exchanges data with a persistence layer. The View is in charge of producing what is directly visible to the user, . web pages. The Controller is the layer that receives requests from clients, determines what business logic takes place and where to go next. In the Struts framework, the Model uses Java classes for the business logic. The View can be implemented with JSP and the Tag lib of Struts. The Controller is a J2EE component known as Servlet, more specifically an ActionServlet object, which determines what or when logic gets executed and where the control should get directed.

2 Hibernate Framework Based on ORM

Working with both the object-oriented software and the relational database is a complicated task with Java Database Connectivity (JDBC) because there is mismatch between how data is represented in objects versus relational database. So with JDBC, developers have to write pure the Structured Query Languag (SQL) statements to map an object model's data representation to a relational data model and its corresponding database schema.

Introduction of Hibernate

Hibernate is a flexible and powerful Object-Relational Mapping (ORM) solution to map Java classes to database tables. It is a powerful, high performance object-relational persistence and query service. Hibernate allows developers to express queries in its own portable SQL extension (Hibernate Query Language (HQL))[3], as well as in native SQL, or with an object-oriented criteria and example Application Programming Interface(API). Hibernate itself take s care of this mapping using XML files so developers don’t need to write code for this.

Hibernate is an open source and it is free to use for both development and production deployments, which is a bridge between Java application and relational database and takes charge of mapping between Java objects and relational data. The inside of Hibernate packs the operation of accessing database by JDBC, which provides API of object-oriented database access to upper layer application. So developers can use the object programming thought to operate database sufficiently, caring for the bottom database structure unnecessarily.

Hibernate relieves the developer from 95 percent of common data persistence related programming tasks, compared to manual coding with SQL and the JDBC API[4]. And it can integrate various Web server or application server, and nearly support all popular databases server.

Principle of Hibernate

As shown in figure , Hibernate lies in the middle layer that is between application