畢業(yè)設(shè)計(jì)-在線(xiàn)英語(yǔ)能力測(cè)試系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)-資料下載頁(yè)
2024-12-03 19:42本頁(yè)面
【導(dǎo)讀】使用HTML技術(shù)和JSP技術(shù)作為前臺(tái)顯示。B/S結(jié)構(gòu)中的表示層有Web瀏覽器，它向網(wǎng)絡(luò)上的Web服務(wù)器提出服務(wù)請(qǐng)求，接收Web服務(wù)器返回的頁(yè)面并顯示給用戶(hù)；事務(wù)邏輯層有Web服務(wù)器，它接受用戶(hù)的請(qǐng)求并判斷請(qǐng)求的類(lèi)型。B/S結(jié)構(gòu)代表了當(dāng)前數(shù)據(jù)庫(kù)應(yīng)用軟件技術(shù)發(fā)展的趨勢(shì)，是目前開(kāi)發(fā)Web數(shù)據(jù)庫(kù)應(yīng)用系統(tǒng)普遍采用的數(shù)據(jù)庫(kù)系統(tǒng)體系結(jié)構(gòu)。它的優(yōu)點(diǎn)使它成為構(gòu)建高效安全Web數(shù)據(jù)庫(kù)應(yīng)用系統(tǒng)首選的體系結(jié)構(gòu)
【正文】 air, to be highly effective and the network. The network test system should be able to satisfy the massive examinees in any place, any time all can participate in the test, and automatic judgment result. Through to the test service demand multianalysis, the main function which this system should provide as follows: 1) The examinee may online carry on the test, after the test had finished by puter automatic judgment score, and the recording result, the examinee also may examine the standard answer. If the test time, the system automatic prompt pletes an assignment and stops doing answers. 2) The teacher may online establish the revision question bank, revises the examinee individual material, and monitors the examination place situation and so on. 3) the manager may online establish reference material and so on the examinee, teacher, the verification question bank, arranges the examinee to take a test, revises the examinee and the examination place condition, inquires the examinee to take a test the result, monitors the examination place situation as well as the establishment test project with tests the test question number and so on. Moreover for the guarantee test fair, is fair, the examination paper test question stochastically extracts by the puter from the question bank. For strictly will cease the test to cheat the behavior, the system later is best also should provide the function which the fingerprint confirmation will register. Its main flow is: After the user basis is authorized registers, the system basis user jurisdiction difference, establishes the corresponding operation. After the train attendant registers may carry on the test, operation and so on examination result and standard answer。 After the teacher registers may carry on revises operation and so on examinee39。s individual material, revision question bank, revision user password as well as monitoring test situation。 After the manager registers besides has teacher39。s all functions, but also may carry on the verification question bank (only has verified question bank only then to be allowed to carry on test),establishment operation and so on test time, inquiry, printing test result. Also may establish following several items: Test workstation: Carries on the test to the examinee the customer end procedure. Mainly provided has carried on according to the system disposition stochastically sets the topic of a position, the confirmation registers, test function and so on time prompt, automatic judgment result, examination test result as well as standard answer. Test workstation divides into the customer end procedure and the Web way in the realization way, former allows the examinee (support touches screen test pattern) through the customer end procedure the way to carry on the test, latter allows the examinee to carry on the test through the test specialpurpose network. The test establishes the workstation: Carries on the establishment tote test service the customer end procedure. Mainly provided the revision question bank, the verification question bank, revised the examinee material, establishes the examinee/examination place condition, the inquiry/printing test result, the question bank inducts/derives function and so on function as well as monitoring test situation. Test application server: Network online test system application server. Mainly has realized the data cushion and the test service logic seal and duplicate uses the function, is takes a test the workstation, the test establishes the workstation and the database server connection. Has provided the rich connection using the server, may increase or the reduced service rule through the module way, considered later will take a test the service promotion, also should reserve the new test type connection using the server level, will cause later the system to expand conveniently. Moreover, for guarantee test effectiveness, using server support hot backup database server pattern, namely if presently is using the database server breaks down, then in the system disposition reserve database server automatic cutover for the current database server, all these is does not know in the user with in the intervention situation carries on. Through application server level effectiveness, truly caused the test service to achieve the use easily, the function formidable, the performances table, the modular degree was strong, has satisfied the new time to an information construction higher request.Furthermore, considered the system the stability with carries out the efficiency, in the analysis network configuration foundation, the system later might select distributional three C/S and B/S will mix with the overhead construction method, namely: The examinee if miscarries on the test in this section, may choose the C/S structure to touch the screen test and the examination site test pattern。 If the examinee is carries on the test in the outside areas, may choose the B/S structure the examination site test pattern.The network online test system needs to carry on the data through the network the transmission, 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 SQ
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