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FTP文件传输课程设计班级：学号：姓名：摘要进入信息时代，随着互联网普及，只要接上网络，就能从网上找到庞大的数据资源，其内容包罗万象，可以说几乎任何人都可以在Internet资源中找到自己所需要的信息资源。有了网络，使用者不但可以浏览各种各样的信息资源，还能够将自己感兴趣的资源下载到本地机上。计算机之间数据的传输大多是通过文件传输协议FTP来完成的。FTP使用两个TCP连接来实现文件传送操作。FTP可以管理四类不同的文件类型,且可用多种模式传输文件。本系统是用JBuilder9.0作为开发工具完成的，系统有着良好的界面，简单易用，系统开发的总体任务是连接FTP服务器，上传/下载文件；并使用Serv-U软件构建FTP服务器,使客户端用户能够通过互联网访问FTP服务器,进行信息资源的共享和传输。论文首先介绍FTP文件传输协议的原理和工作的机制。然后简要介绍开发FTP客户端应用程序的一些详细的步骤(如何建立文件传输的数据连接过程)并提供了一个完整的JAVA实现的文件传输程序模块,以此来演示使用JAVA开发FTP客户端应用程序的一些具体细节。本次论文的设计，即从需求分析，软件设计到软件功能实现，都始终遵循软件工程的思想和数据库的设计方法。在本文中采用了大量的图表说明，使文章明确清晰，便与阅读和理解。关键词：FTP文件传输系统，JBuilder9.0,网络技术，软件工程ABSTARCTDuringenteringtotheinformationtimes,alongwiththeInternetuniversal,solongasconnectwiththenet,youcanfindoutthehugedataresourcesfromtheInternet.ItisalmostsaidthateveryonecanfindouttheinformationresourceswhichyouneedintheInternet.Hadthenetwork,theusercannotonlybrowsevariousofinformationresources,butalsodownloadresourceswhichyouareinterestedin.Mostofthedatatransferbetweencomputersarerealizedthroughfiletransferprotocol-FTP.GenerallyFTPmeansfiletransferservice.UsingtwoTCPconnections,FTPcanrealizefiletransfer.ThissoftwaresystemcompleteswiththeJBuilder9.0tools.Andthesystemhasgoodinterface,usinginbriefandeasily.ThetotalmissionofthesystemistolinktheserverofFTP,spreadingup/downloaddocuments.AndaFTPservercanbebuiltbythesoftwareofServ-U.TheuserofclientsidethencanvisittheFTPservertouploadordownloadthefiles.FirstlythisdesignintroducesthemechanicsandprincipleofFileTransportationProtocol(FTP).Thendetailedsteps(howtomakeadatalinkforfiletransport)ofdevelopingtheFTPClientarepresented.Aprogrammingmoduleoffiletransport,writteninjavaisavailabletodemonstratethespecificsofdevelopingaFTPClientApplicationinJAVA.Thedesignofthissoftware,namelyanalyticalfromtheneed,thesoftwaredesignsthefunctiontocarryout,allfollowingthethoughtofthesoftwareengineeringandthedesignmethodofthedatabasesalways.Thistexthadagreatdealofchartelucidation,makethearticledefinitelyclear,thenwithreadandcomprehendeasily.KeyWords:FTPFiletransportationsystem,JBuilder9.0,networktechnique,softwareengineering.目录摘要..................................................................................................................................................1ABSTARCT............................................................................................................................................3目录...................................................................................................................................................I3第一章绪论......................................................................................................................................11．1课题简介..........................................................................................................................11．2FTP的工作原理..............................................................................................................11．2．1FTP连接............................................................................................................11．2．2FTP数据处理....................................................................................................21．2．3FTP命令以及响应............................................................................................21．2．4FTP登陆............................................................................................................21．3相关技术和开发工具.....................................................................................................21．3．1JAVA简介..........................................................................................................31．3．2Jbuilder9.0编程环境..................................................................................31．3．3C/S的网络通信模式..........................................................................................41．3．4FTP服务器端软件Serv-U...............................................................................4第二章系统需求分析......................................................................................................................62．1任务概述.......................................................................................................................62．2设计思想.......................................................................................................................62．3系统工作流程与结构...................................................................................................62．4用例描述.......................................................................................................................72．5分析与设计.................................................................................................................102．6相关类的设计.............................................................................................................13第三章系统界面设计及模块实现................................................................................................163．1功能说明................................................................................................................