Research and Design of Online Test-evaluating System Based on J2EE

This paper researches the strategy of online test-evaluating system,and instroduces the strategy of extracting and assembling subject,and brings forward dynamic algorithms of confirm difficulty coefficient and model of random assembling subject.Evaluating strategy is organizing and forming a individual plan according to knowledge point of worked subject and history records.The plan can lead the student study.The system is designed base on J2EE in term of above stragegy.This paper also introduces the main technology based on J2EE.