The Development And Research Of Distributed System Based On DCOM

In recent years, with the rapid progress of internet,people can access computereasily, that follows that there is enough physical basis to work and/or study with thehelp of computer and internet. On the one hand, more and more repeated work makesworkers fatigue;on the other hand, the continuous acceleration of commercial rhythmand very fast updating of various kind of softwares make it hard to live on under suchsurroundings. Just for the two reasons illustrated above, it is necessary to developsoftware develop method. The program development technology based on componentjust is such a method which can meet people's need. This method has manyadvantages such as high efficiency, easily updating, high recycle use of code, easilyupdating edition, moreover it is independent of operating system and language, whichmakes itself become preferred when programmer are going to choose a method ofdeveloping softwares. DCOM is a component standard put forward by Microsoft, andWindows operating system holds most users, therefore DCOM becomes a universalcomponent standard. But because of DCOM's inherent bug in its security supportmechanism, more use of it is limited. This paper begins with the programdevelopment technology based on component, then work over security mechanism onthe basis of chaos, finally a distributed exam system based on DCOM is developed.The most content of this dissertation is followed:(1) Study and analyze the system structure of distributed application program,then advance integrant strategy when we choose the middleware. At last analyze thefunction of COM in whole distributed operating system by using object-modelmethod.(2) Discuss the realizing mechanism of COM&DCOM in detail, and put forwardautomation technology for the sake of laying a foundation for our DCOMdevelopment.(3) Go deep into analysis of security mechanism based on DCOM, then abandonthe intrinsic security mechanism after its security leaks are found, and design our ownDCOM security mechanism grounded on chaos, which lays a found of a newDCOM security mechanism for developing distributed teaching exam system.(4) Design the whole framework of distributed teaching exam system and devisenecessary components concretely. Finally test and run the developed system, theexpected effect is achieved.