下面是访问日志文件
2008-8-13 14:43:22

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322)



2008-8-13 14:43:27

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322)



2008-8-13 14:44:18

Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)



2008-8-13 14:44:26

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; QQDownload 1.7; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)



2008-8-13 14:45:17

Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)

打开这个文件，这个文件用于记录访问搜索吧的正常访客或者机器人蜘蛛，从中提取的蜘蛛有： Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Gigabot/3.0 (http://www.gigablast.com/spider.html)

Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)

Mozilla/5.0 (compatible; YodaoBot/1.0; http://www.yodao.com/help/webmaster/spider/; )

Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)

msnbot/1.1 (+http://search.msn.com/msnbot.htm)

Baiduspider+(+http://www.baidu.com/search/spider.htm)

代码也十分的简单：

你可以自己用这个代码试下，发现会输出类似： Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; TencentTraveler 4.0; .NET CLR 2.0.50727; .NET CLR 1.1.4322)