Newly increased file detection and downloading method and device for FTP (File Transfer Protocol) server

Abstract

The invention discloses a newly increased file detection and downloading method and device for an FTP (File Transfer Protocol) server. The method comprises the steps of scanning an appointed directory, thereby obtaining an FTP object list under the appointed directory; when an FTP object in the FTP object list is a file, judging whether the file satisfies a preset first condition or not, wherein the first condition comprises one or more of the following conditions that a file size satisfies strategy setting, a file name satisfies regular filtering and the modification time of the file is not expired; and when the file satisfies the first condition, judging whether the modification time of the file is later than the newest downloading time of the directory in which the file is located or not, and when the modification time of the file is later than the newest downloading time of the directory in which the file is located, downloading the file. Through application of the technical scheme provided by the invention, the judgment times is reduced, and the integrated judgment speed is improved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for detecting and downloading newly added files of an FTP server. Background technique [0002] FTP is the English abbreviation of File Transfer Protocol (File Transfer Protocol). The FTP server is a computer that provides file storage and access services through FTP. Visitors can use the FTP client to remotely access the FTP server through the network and read the files stored in the FTP server. . The download logic of the scene where the FTP server file can be deleted is relatively simple, just download it if it exists, and delete the FTP server file if the download is successful; but in the scene where the FTP server cannot be deleted, there will be historical files piled up, and a new file detection method is required In order to quickly download effective new files. In order to allow many visitors to share files provided by the FTP server and avoid m...

AI Technical Summary

Problems solved by technology

[0004] The above method has the following defects: First: the applicable scene is limited

This patent application is aimed at the files in the specified FTP directory, and does not consider the scenario that the specified FTP directory contains subdirectories, which is especially common. In the scenario of containing subdirectories, there will be duplicate file names. This patent application The detection method that only records the file name and modification time cannot be applied

Second: possible missing files

The modification time of the FTP file obtained by the client through the FTP command "dir" can only be accurate to the minute. Even if the modification time of the specified FTP file is obtained through the FTP command "quote mdtm specifying the FTP file name" one by one, the modification time can only be accurate to the second. The second-to-second method needs to interact one by one and consumes a lot; if the file has a new modification within 1 second and the modification time obtained is unchanged, it will not be regarded as a new file. In this scenario, missed files will appear, and the file has Modification failed to download

Third: Low detection efficiency

[0006] The above algorithm has two main defects of low efficiency and inability to run continuously: first: the detection efficiency is low

During the detection, all the file attributes of the FTP server will be compared with the attributes of all records in the log file. When the FTP server has a large number of files and the local configuration file records a large number of records, the detection efficiency is low. lead to unavailability

Second: Unable to run continuously: the algorithm implementation method is to write the path address, file name, file modification time and file size and other attribute values ​​in the FTP into the log file to save after the file is successfully downloaded. No cleaning strategy for this log file is proposed. As the running time goes by, this log file will expand infinitely, which will have a performance impact on writing new records to the log file, and will also bring storage pressure to the client machine, which will eventually lead to inability to continue running

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