要构建搜索引擎，首先要收集各个FTP站点的文件信息，记录到数据库，用于提供搜索。因特 网中有许多的FTP站点，要收集某个FTP站点的信息时，从数据表中读出站点信息，然后登陆到此站点，多数FTP服务器都开辟有一个公共访问区，称为"匿 名FTP"，对公众提供免费的文件信息服务，一般用户名为 Anonymous，密码为一个Email地址。数据采集程序用此用户名和密码登陆站点，然后对站点所有目录进行采集，读取每个目录下的文件信息，在收到 文件信息之后，对其进行分析，将文件信息存储到相应的数据表字段中。完成此站点的数据采集之后，再读取另外一个FTP站点的信息，进行文件信息采集。如此 循环，采集所有已知FTP站点的文件信息。-To build a search engine, we must first collect the FTP site file information, record to the database, to provide search. There are many Internet FTP site to a FTP site to collect information, data tables read from the site information, then visit this site, most FTP servers are opening up a public access area, known as "anonymous FTP" of the documents available to the public free information service, the average user named Anonymous, the password for an Email address. Data acquisition program with this user name and password login site, and then all the directory site acquisition, reading each directory file information, after receiving the file information, analyze it, will be stored into the appropriate file information table field. Completed after data collection for this site, and then read another FTP site information, to file information collection. This cycle, collecting all known FTP site file information.