一种自适应FTP服务器的增量文件下载算法  

Self-adaptability Incremental File Download Algorithm for FTP Server

作　　者：张志强[1,2] 郑加林[1] 王伟钧[1] 苏长明[1] 黎忠文[1] 

机构地区：[1]成都大学信息科学与工程学院,四川成都610106 [2]成都大学模式识别与智能信息处理四川省高校重点实验室,四川成都610106

出　　处：《成都大学学报（自然科学版）》2016年第3期234-239,共6页Journal of Chengdu University（Natural Science Edition）

基　　金：四川省教育厅自然科学基金(15ZB0390);四川省科技厅科研课题(2014ZR0218);四川省科技厅应用基础研究(2014JY0054)资助项目

摘　　要：FTP服务器是数据挖掘过程中重要的数据存储源.目前存在的文件下载策略在下载增量文件时有较多的局限性,具有无法自动判断增量文件以及文件重复下载等问题,从而使得增量文件下载效率较低.通过对文件下载算法的研究,提出并实现了一种新的自适应FTP服务器增量文件下载算法,进行了算法通用性、自适应网络环境的断点续传、下载速率的优化等方面的研究,并进行了算法的下载实验分析,完成了文件下载速率优化的比较.实验结果表明,新算法能够自动搜索FTP服务器增量文件,能自适应网络环境实现文件快速下载,在大数据量的FTP数据源中提高了增量文件的下载效率.FTP server is an important source of data storage in data mining process. In practical application, FTP server is used to store the increasing large data files, which are needed to be obtained in the later stage of data mining. For the smooth implementation of data mining projects, it is important to do a research on and design efficient algorithm for downloading files. At present, as for the downloading incremental files based on the current files＇ downloading strategy, there are many limitations. For example, the current files＇ downloading strategy cannot automatically detect incremental files and deal with problems like repeatedly downloading the same files. Therefore, the efficiency of incremental file downloading is very low. Through research on the file downloading algorithm, this paper has proposed and implemented a new self-adaptability FFI？ server incremental file do^aloading algorithm, and studies the generality of algorithm, the resuming of broken transfer under self-adaptability network and download rate optimization, etc. In order to verify the performance of the algorithm, an experimental analysis of the algorithm is carried out, and a comparative experiment on the optimization of file download rate is also done. Experimental results show that the new algorithm can automatically search the FTP server incremental files, and can achieve the rapid downloading of files,be self-adaptive to network environment, and especially can effectively improve the efficiency of the incremental file downloading in FTP data source with a large amount of data.

关 键 词：FTP 增量文件 通用性 自适应 断点续传 下载速率的优化 

分 类 号：TP393.093[自动化与计算机技术—计算机应用技术]