Hot to searching node use Nokogiri

nokogiri_2.rb

require 'nokogiri'

xml = %q(<root>
  <sitcoms>
    <sitcom>
      <name>Married with Children</name>
      <characters>
        <character>Al Bundy</character>
        <character>Bud Bundy</character>
        <character>Marcy Darcy</character>
      </characters>
    </sitcom>
    <sitcom>
      <name>Perfect Strangers</name>
      <characters>
        <character>Larry Appleton</character>
        <character>Balki Bartokomous</character>
      </characters>
    </sitcom>
  </sitcoms>
  <dramas>
    <drama>
      <name>The A-Team</name>
      <characters>
        <character>John "Hannibal" Smith</character>
        <character>Templeton "Face" Peck</character>
        <character>"B.A." Baracus</character>
        <character>"Howling Mad" Murdock</character>
      </characters>
    </drama>
  </dramas>
</root>)

doc = Nokogiri::XML(xml)

# 搜索搜索 sitcom 节点, 直接使用元素名 (Element)
sitcom_node_set = doc.css('sitcom')
puts sitcom_node_set.size # 2

# 通过 CSS 搜索子节点, <name>
name_node_set = doc.css('sitcom name')
puts name_node_set.size # 2 , 不是 3, 因为是查询 sitcom 下的 name

# 还有任何你想象得到的 css 选择语法



# ------------------------ Further Info --------------------
# 解析出来的不是 Node, 而是 NodeSet
sitcom_node_set.class # Nokogiri::XML::NodeSet
# 对于他的操作详细可参考: https://github.com/sparklemotion/nokogiri/wiki/Cheat-sheet#working-with-a-nokogirixmlnodeset
# 其中使用的最多的 API 为 each, inner_html, inner_text/text, at_css, css, to_x

sitcom_node_set.each do |node|
  # 遍历 NodeSet, 返回的才是一个一个的 Element (其实就是 Node)
  puts node.class # Nokogiri::XML::Element  refs: http://nokogiri.org/Nokogiri/XML/Element.html
end