| With the rapid development and popularization of Internet technique, the network message resources improve gradually. A kind of completely new education model-distant education has made a breakthrough in the method and resource of the traditional education. It meets many basic requirements such as without the limitation of time and space, sharing the resource and opening the system. The design objective of the Internet educational terrace is to utilize the advanced IT, according to different educational models and different educational characters, the distant education gives us a flexible, shrinked, and interactive education environment.Dividing the web site function into modules is very common in implementing web site function. In this paper, the function of the web site was divided into two relative modules and each module was depicted particu1arly,then as to the online testing module,given detailed design,it is included coming out the algorithm of the examination that is at the random.According to the current trend of formulating questions independence,put forward a new management mechanism of test, and give a detailed design and realization.In this module,the last partion ,provide a preliminary analysis module which is not relate to application and used to guiding teaching and studying for student,teacher,test and test paper.The system uses the three-level Brower/Server model. The platform is Microsoft Windows 2000 Advanced Server ,and Tomcat5.0 as the Web server ,and MS SQL Server2000 and PostgreSQL(management mechanism module of formulating questions independence ) as the Database server. Developed with JSP technology, a dynamic Web technology,the system is able to form homepage dynamically using the server scripts and perform many functions readily when used with the JavaBean components. Java Database Connectivity (JDBC),a new technology that uses database connection pool.It can improve the changing capacity of database. This system's developmental technology is mainly characterized by its making use of a series of technologies based on J2EE and the Model-View-Controller (MVC) model applied masterly to the Web application programs. The main creative point is that the common MVC model is improved,a MVC model based on struts is implemented,and the new model's performance by using this kind of structure is analyzed. Then put forward a method of composing examination questions by location, and accomplish the examination questions management process and ascertain the area ranges of one question by map operation.The safety of Web site is important in any condition,so how to guarantee the safety of web site with any possible measure is a necessary portion of the paper.MD5 encipher strategy is adopted to protect the system safely in the paper. |
