（售后服务）TCPIP网络编程上传下载客户服务端品质.doc

（售后服务）TCPIP网络编程上传下载客户服务端 摘 要 FTP（File?Transfer?Protocal，文件传输协议）是Internet上最早提供的服务之一，它通过客户端和服务器端的FTP应用程序在Internet上实现远程文件传送，是Internet上实现资源共享的最方便、最基本的手段之一。FTP服务器广泛应用于我们的工作和生活之中，为了能更好的使用FTP服务器，也为了FTP服务器能适用于更广的人群，F 可以方便地提供更安全，更稳定，更快速的文件传输服务。 关键字： FTP服务器，信息安全，消息号，多线程 ABSTRACT FTP (File Transfer Protocol, File Transfer Protocol) is one of the first to provide the service on the Internet, it is through the client and FTP server for remote file transfer application on the Internet, is the sharing of resources on the Internet the most convenient, basic one of the means .At the same time to enable the FTP server to run more stabler, it needs to own the guard ability attacktion initiatively in network. Under this background, this article elaborated the design and the realization about Secure FTP Server. Through increasing the information security in the application layer of the FTP server (for example, use encryption and decryption to keep data secrecy, such as uses Hash Algorithm to make data integrity, or use digital signature to guarantees anti-denial nature of the data manipulation) so it can guarantee the data safe from the transmission to the reception,which can increase guard to the network attacktion (for instance, use news number and connection number to limit the resists flood attacks and so on,which including in replay attack) ,to guarantee the steadiness of FTP server; The use of multithreading mechanism can realize to prompt receive of the client side information and fast processing, in order to full use server hardware resources and guarantee highly effective running rate.This system conforms to the need in current time, and can be suitable to all situations and the crowd, may provide file transfer service conveniently ,safely, stably,and more faster. Key Words: FTP server,information security,message id, multithreading 目 录 目 录 TOC \o "1-3" \h \z \u 4.2.2 FTP服务 13 4.2.3 FTP客服端 16 第5章 系统设计 17 5.1 系统总体设计 17 5.1.1 架构设计 17 5.1.2 总体设计 18 5.2 系统详细设计 19 5.2.1 套接字应