从所有搜索结果页面中抓取信息的数据

Question

我正试图从UCAS网站上抓取数据，以显示从基本搜索返回的所有页面中的所有Uni名称。

到目前为止，在没有循环工作的情况下，它显示了第一页中所有大学的名称以及一些随机信息，如下所示：

"The University of Aberdeen
Abertay University
Aberystwyth University
ABI College
Abingdon and Witney College
The Academy of Contemporary Music
Access to Music
Accrington & Rossendale College
Activate Learning (Oxford, Reading, Banbury & Bicester)
The College of Agriculture, Food and Rural Enterprise
Amersham & Wycombe College
Amsterdam Fashion Academy
Anglia Ruskin University
Anglo European College of Chiropractic
Arden University (RDI)
University of the Arts London
Arts University Bournemouth (formerly University College)
ARU London
Askham Bryan College
Aston University, Birmingham
Availability
Applying through Extra
Single/Combined subjects
Provider types
How you study
Qualification level
Conservatoire specialism"

这是我的代码：

require 'rubygems' 
require 'nokogiri'  
require 'open-uri'  
require 'mechanize'
mechanize = Mechanize.new
doc = mechanize.get('http://search.ucas.com/')
form = doc.forms.first
form['Vac'] = '2'  
form['AvailableIn'] = '2016'  
doc = form.submit
doc.search('li.results clearfix').each do |h3|  
puts h3.text.strip  

while a = doc.at('div.pagerclearfix a')   
doc = Nokogiri::HTML(open(a[:href]))    
doc.search('results clearfix').each do |h3|    
puts h3.text.strip   
end 
end 
end

Answer 1

您不需要require 'rubygems'，因为这是一个反模式。您不需要像机械化所要求的那样使用require 'nokogiri'，也不需要OpenURI。

由于pager和clearfix是独立的类，div.pagerclearfix选择器不匹配任何内容，因此分页不起作用。此外，while循环位于错误的位置，它不应该位于打印结果的each循环内。

你最终应该得到这样的东西：

require 'mechanize'
mechanize = Mechanize.new
page = mechanize.get('http://search.ucas.com/')
form = page.forms.first
form['Vac'] = '2'
form['AvailableIn'] = '2016'
page = form.submit
page.search('li.result h3').each do |h3|
puts h3.text.strip
end
while next_page_link = page.at('.pager a[text()=">"]')
page = mechanize.get(next_page_link['href'])
page.search('li.result h3').each do |h3|
puts h3.text.strip
end
end

有多种方法可以实现分页，搜索"下一页"链接通常是最简单的。