【正文】 ...................................................... 11 二層數(shù)據(jù)流圖 ............................................................................... 12 3 概要設計 ................................................................................................................................. 13 系統(tǒng)實現(xiàn)原理 ........................................................................................ 13 系統(tǒng)實現(xiàn)層次圖： .............................................................................. 14 各模塊詳細功能 .................................................................................... 14 服務器端結構 .................................................................................. 14 客戶端結構 ..................................................................................... 15 4 詳細設計 ................................................................................................................................. 16 系統(tǒng)流程圖 ........................................................................................... 16 系統(tǒng)總體流程圖 ............................................................................. 16 系統(tǒng)客戶端流程圖 ....................................................................... 17 編寫服務器端程序 ............................................................................... 17 問題陳述 ......................................................................................... 17 解決方案 ....................................................................................... 18 客戶端程序編寫 ........................................................................................................... 22 聊天室 ............................................................................................. 23 參考文獻 ...................................................................................................................................... 29 致謝 ...................................................................................................................... 錯誤 !未定義書簽。Eclipse 。 關鍵字 ： 多線程 ； 客戶機 /服務器 ； JAVA ； Socket ； Eclipse ； TCP/IP 2 Abstract as the work bee more and more developed, people bee more and more lean to the work, and can not leave with out it. This caused the chat materials bee more numerous, as the overseas ICQ system, the OICQ system that invented by Tencent Co., and so on. So we create a work chat medium just like the . Java work programming based on the power, the use of Java designed to prepare graduates a chat system. In general, the majority of the chat tool for client and server program in addition to serverside storage of customer data for the database, the system uses a client / server architecture model the adoption of Java provided Socket class connect client and server and between the client and server municate with each other, as the chat is to provide pointtomultipoint and multithreaded Java function to be pleted by using multithreaded chat and more pointtomultipoint, database management system with SQL Server2020 the pletion and adoption of JDBCODBC Bridge access the database. The system built on the JAVA platform, the system design using objectoriented technology and objectoriented design principles. System uses the C / S structure, client and clientside and serverside client and send messages through Socket. The use of JAVA language, development tools using Eclipse. Design and Implementation of serverside process, the use of multithreading technology, which can process in a single run at the same time a number of different threads, the implementation of different tasks. Procedures greatly enhanced the use of server resources. Chat system will allow people to plete chat to more friends， and the system can add, delete somebody， can deal with new user registration, send messages, receive messages and so on. Keywords : Multithreading 。使用 JAVA 語言編寫，開發(fā)工具采用 Eclipse?；?Java 網(wǎng)絡編程的強大功能 ， 本 次畢業(yè)設計使用 Java 編寫一個聊天系統(tǒng)。 一般來說，聊天工具大多數(shù)由客戶端程序和服務器程序外加服務器端用于存放客戶數(shù)據(jù)的數(shù)據(jù)庫組成，本系統(tǒng)采用客戶機 /服務器架構模式通過 Java 提供的Socket 類來連接客戶機和服務器并使客戶機和服務器之間相互通信，由于聊天是多點對多點的而 Java 提供的多線程功能用多線程可完成 多點對多點的聊天，數(shù)據(jù)庫管理系統(tǒng)用 SQL Server2020 完成并通過 JDBCODBC 橋訪問數(shù)據(jù)庫。服務器端設計與實現(xiàn)過程中，采用了多線程技術，可以在單個程序當中同時運行多個不同的線程，執(zhí)行不同的任務。 Client/Server 。TCP/IP 3 目 錄 1 緒論 ................................................................................................................. 錯誤 !未定義書簽。 4 1 緒論 國內外聊天系統(tǒng)的研究現(xiàn)狀 目前國內外做聊天系統(tǒng)的公司很多，產品也琳瑯滿目，國內有諸如騰訊 、新浪 UC、網(wǎng)易泡泡等，國外有著名的 MSN（新版改名為 Live Messenger）以及跨平臺 Ga