获取URL字符串参数？

Question

我在我的数据库中的"位置"字段中有此URL:

http://www.youtube.com/watch?v=xxxxxxxxxxxxxxxxxxx

我可以得到它@object.location,但我怎样才能得到它的价值v？我的意思是,"xxxxxxxxxxxx"从URL字符串中获取？

Answer 1

require 'uri'
require 'cgi'

# use URI.parse to parse the URL into its constituent parts - host, port, query string..
uri = URI.parse(@object.location)
# then use CGI.parse to parse the query string into a hash of names and values
uri_params = CGI.parse(uri.query)

uri_params['v'] # => ["xxxxxxxxxxxxxxxxxxx"]

请注意,从返回CGI.parse是Hash的Strings,以Arrays使其可以处理多个值相同的参数名称.对于你想要的例子uri_params['v'][0].

另请注意,如果找不到请求的密钥,则Hash返回的CGI.parse将返回[],因此uri_params['v'][0]将返回值或nilURL不包含v参数.