基于java在线考试系统毕业设计外文翻译

基于java在线考试系统毕业设计外文翻译内容摘要：

, therefore applies the server, the Web server and the database server security must from the system design time carries on the plan. We might use below the security measure: 1) In stalls the reliable firewall, carries on the effective containment to the exterior malicious attack. 2) The server (including applies server, database server and the Web server) the hard disk district transformation is the NTFS form, open sure sportive jurisdiction according to the different demand for the user. 3) May write the essential code the DLL module, not only streng the need the security, simultaneously also caused the system the modular degree to strengthen, enhanced the system performance. 4) May carry on two times of encryptions in the database to the essential data. 5) 2,000 data backups with restores the function using SQL the SERVER, guarantees the database information the integrity and the security. The current software quite popular system structural model mainly has: C/S structural model and B/S structural model. These two kinds of structures may divide into two with the multilayered overhead con saturation, the main difference lies in whether has used them idle ware (for example COM+ or CORBA) es the overhead construction to apply the server level. This structural model unified distributional multilayered C/S and the B/S merit designs, divides into the customer level, business logic level and the data level in the usual situation. Customer level: Below mainly uses for to satisfy the overall system each kind of visit demand and processes works: The receive user39。 s in put, carries on the analysis inspection to user39。 s input and makes corresponding processing。 Sends out the data to the server to request that, demonstrated by movement result which transmits using the server. The customer level usually is posed by the customer advancement, the customer advancement mainly includes the advancement in this model which the IE browser dynamic foundation the advancement as well as the customer end test workstation founds and so on. Business logic level: Will be responsible to receive the request which will transmit from the customer end or the tour and to request will bequeath the first floor to carry on processing, simultaneously will request the processing result transmission for the customer end or the brow ser. Business logic level advancement mainly is posed by middle ware MTS/COM+ as well as some related processing advancements. Microsoft Corporation has promoted Windows DNA under the Windows platform (Distributed inter Net Application Architecture, distribution work application structure) strategy. Takes Windows COM+ in the DNA strategy the middleware. In the Windows 2,000 above operating systems, COM+ has bee a system part. COM+ was the intermediate level has characteristic provided the load balance, the object pond (Object Pooling), business characteristic and so on a series of force support, and the procedure which worked in COM+ receives the operating system the protection, thus the biggest guarantee system security, stable and was highly effective. In this model, mainly through the ADO realization data dynamic ration, ADO is the Microsoft current mainstream data accessing module, pares with the former data accessing technology, it has provided the extremely simple object model, and has sealed t。