本文選題：P2P + 即時通信��； 參考：《東北師范大學(xué)》2012年碩士論文

【摘要】：隨著互聯(lián)網(wǎng)技術(shù)的不斷發(fā)展，即時通信系統(tǒng)已經(jīng)成為人們?nèi)粘Ｉ畈豢苫蛉钡慕M成部分，它以一種實(shí)時通信方式為用戶提供實(shí)時有效的溝通。P2P技術(shù)已經(jīng)被廣泛應(yīng)用到許多領(lǐng)域，例如文件存儲，搜索引擎，對等計(jì)算等,基于P2P的即時通信系統(tǒng)也越來越受到人們的關(guān)注。目前最為流行的即時通信系統(tǒng)如MSN，ICQ，QQ等都屬于P2P的應(yīng)用，但這些即時通信軟件客戶端都沒有服務(wù)，這種軟件的客戶端在沒有信息交互時會不斷的向服務(wù)器發(fā)送數(shù)據(jù)包報(bào)告自己的狀態(tài)，這樣就會占用大量帶寬，造成資源浪費(fèi)，對互聯(lián)網(wǎng)是一種嚴(yán)重的污染，隨著這種類型軟件的不斷攀升,有可能會導(dǎo)致Internet的崩潰。而且這些軟件的資源都存在服務(wù)器上，對服務(wù)器的性能要求較高，并容易使服務(wù)器由于壓力過大而癱瘓，從而使整個系統(tǒng)不能正常使用。 本文對P2P和即時通信系統(tǒng)的相關(guān)理論和技術(shù)進(jìn)行了介紹，說明了研究基于P2P的即時通信系統(tǒng)的意義和價值。該系統(tǒng)將改變了C/S這一傳統(tǒng)模式，使用P2P與C/S相結(jié)合的模式，以P2P技術(shù)為主，C/S結(jié)構(gòu)為輔，基本上脫離單個中心服務(wù)器的束縛，網(wǎng)絡(luò)中的任何節(jié)點(diǎn)自身即有客戶端也有服務(wù)端，系統(tǒng)中每個節(jié)點(diǎn)即可以作為客戶端請求服務(wù)，也可以作為服務(wù)端提供服務(wù)，用戶只在登陸時訪問服務(wù)器，將本地所需要的信息加載到本地服務(wù)端，登陸完成后，用戶之間通信不再訪問服務(wù)器，避免了在沒有信息交互時客戶端與服務(wù)端之間的數(shù)據(jù)傳輸，減少了對帶寬的占用。而且該通信系統(tǒng)把資源都分布式的存儲在網(wǎng)絡(luò)上的各個節(jié)點(diǎn)中，大大的減輕了服務(wù)器的壓力，有效解決了服務(wù)器的單點(diǎn)失效的問題。該系統(tǒng)還使用XML文檔對數(shù)據(jù)進(jìn)行外部存儲，不再使用龐大的DBMS（數(shù)據(jù)庫管理系統(tǒng)），大大減少了對系統(tǒng)資源的占用，降低了在數(shù)據(jù)庫管理系統(tǒng)方面的開銷，也提高了效率。同時考慮到系統(tǒng)安全性和穩(wěn)定性，引入對等節(jié)點(diǎn)互評機(jī)制在一定程度上有效的避免了惡意節(jié)點(diǎn)的攻擊，并在服務(wù)端設(shè)置了數(shù)據(jù)庫備份和記錄事務(wù)日志功能。本文采用面向?qū)ο蟮乃枷腴_發(fā)一個基于P2P的即時通信系統(tǒng)，并開發(fā)一個網(wǎng)絡(luò)數(shù)據(jù)包捕捉程序?qū)υ撓到y(tǒng)進(jìn)行測試和結(jié)果分析，，基本上達(dá)到了預(yù)期目標(biāo)。
[Abstract]:With the continuous development of Internet technology, instant messaging system has become an indispensable part of people's daily life. It provides real-time and effective communication for users by a real-time communication mode. P2P technology has been widely used in many fields. For example, file storage, search engine, peer-to-peer computing, P2P-based instant communication system has also attracted more and more attention. The most popular instant messaging systems, such as MSN, ICQQ, QQ and so on, belong to P2P applications, but none of these instant messaging software clients have any services. The client of this kind of software will send packets to the server continuously to report its status when there is no information interaction, which will take up a lot of bandwidth and cause waste of resources, which is a serious pollution to the Internet. As this type of software continues to climb, it is possible to cause the Internet to crash. Moreover, the resources of these software all exist on the server, the performance of the server is high, and the server is easily paralyzed because of too much pressure, so the whole system can not be used normally. This paper introduces the theory and technology of P2P and instant messaging system, and explains the significance and value of the research of P2P based instant communication system. The system will change the traditional mode of C / S, using the mode of combining P2P with C / S, using P2P technology as the main auxiliary of C / S structure, basically breaking away from the shackles of a single central server, and any node in the network has its own client and server. Each node in the system can request service either as a client or as a server. The user only visits the server at the time of login, loads the information needed locally to the local server, and after the login is completed, The communication between users no longer accesses the server, avoids the data transmission between the client and the server when there is no information interaction, and reduces the bandwidth occupation. Moreover, the communication system stores the resources distributed in each node on the network, which greatly reduces the pressure of the server and effectively solves the problem of single point failure of the server. The system also uses XML documents to store the data externally, no longer using the huge DBMS (Database Management system), which greatly reduces the consumption of the system resources, reduces the cost of the database management system, and improves the efficiency. Considering the security and stability of the system, the peer peer evaluation mechanism is introduced to avoid the attack of malicious nodes to a certain extent, and the database backup and transaction log functions are set up on the server side. In this paper, an instant messaging system based on P2P is developed with the idea of object oriented, and a network packet capture program is developed to test and analyze the results of the system.
【學(xué)位授予單位】：東北師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP311.52

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