解析XML

一、解析本地XML

 

XML内容如下：

 

  <?xml version="1.0" encoding="UTF-8" ?> 
- <ResultSet xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:yahoo:srch" xsi:schemaLocation="urn:yahoo:srch http://api.search.yahoo.com/WebSearchService/V1/WebSearchResponse.xsd" type="web" totalResultsAvailable="243000000" totalResultsReturned="2" firstResultPosition="1" moreSearch="/WebSearchService/V1/webSearch?query=madonna&appid=YahooDemo&region=us">
- <Result>
  <Title>Madonna</Title> 
  <Summary>Official site of pop diva Madonna, with news, music, media, and fan club.</Summary> 
  <Url>http://www.madonna.com/</Url> 
  <ClickUrl>http://www.madonna.com/</ClickUrl> 
  <DisplayUrl>www.madonna.com/</DisplayUrl> 
  <ModificationDate>1295769600</ModificationDate> 
  <MimeType>text/html</MimeType> 
- <Cache>
  <Url>http://uk.wrs.yahoo.com/_ylt=A0PDBgoeIT5NIkUANj_dmMwF;_ylu=X3oDMTBwOHA5a2tvBGNvbG8DdwRwb3MDMQRzZWMDc3IEdnRpZAM-/SIG=15ihvl486/EXP=1296003742/**http%3A//66.218.69.11/search/cache%3Fei=UTF-8%26appid=YahooDemo%26query=madonna%26results=2%26u=www.madonna.com/%26w=madonna%26d=bkRm7VtsWMrk%26icp=1%26.intl=us</Url> 
  <Size>17828</Size> 
  </Cache>
  </Result>
- <Result>
  <Title>Madonna - Wikipedia, the free encyclopedia</Title> 
  <Summary>Madonna (entertainer), the American singer-songwriter-producer and actress ... Alex Madonna, a real estate developer in California. Madonna Inn which was named after him ...</Summary> 
  <Url>http://en.wikipedia.org/wiki/Madonna</Url> 
  <ClickUrl>http://en.wikipedia.org/wiki/Madonna</ClickUrl> 
  <DisplayUrl>en.wikipedia.org/wiki/Madonna</DisplayUrl> 
  <ModificationDate>1294300800</ModificationDate> 
  <MimeType>text/html</MimeType> 
- <Cache>
  <Url>http://uk.wrs.yahoo.com/_ylt=A0PDBgoeIT5NIkUAOT_dmMwF;_ylu=X3oDMTBwZG5hOWwzBGNvbG8DdwRwb3MDMgRzZWMDc3IEdnRpZAM-/SIG=15vfrntlh/EXP=1296003742/**http%3A//66.218.69.11/search/cache%3Fei=UTF-8%26appid=YahooDemo%26query=madonna%26results=2%26u=en.wikipedia.org/wiki/Madonna%26w=madonna%26d=YjgyQ1tsWIHU%26icp=1%26.intl=us</Url> 
  <Size>29302</Size> 
  </Cache>
  </Result>
  </ResultSet>

 

示例代码：

 

    require 'rexml/document'
    include REXML

    file = File.new("d://yahoo.xml")
    doc = Document.new(file)
    titles, links  = [], []
    doc.elements.each('ResultSet/Result/Title') do |element|  #获取Title值
      titles << element.text
    end
    doc.elements.each('ResultSet/Result/Url') do |element|  #获取Url值
      links << element.text
    end
    titles.each_with_index do |title, idx|
      print "#{title} => #{links[idx]}\n"
    end

 

示例输出：

 

Madonna => http://www.madonna.com/
Madonna - Wikipedia, the free encyclopedia => http://en.wikipedia.org/wiki/Madonna

 

二、解析网络XML

 

示例代码：

 

    require 'net/http'
    require 'rexml/document'

    url = 'http://api.search.yahoo.com/WebSearchService/V1/webSearch?appid=YahooDemo&query=madonna&results=2'
    xml_data = Net::HTTP.get_response(URI.parse(url)).body  # 获取XML数据
    doc = REXML::Document.new(xml_data)  # 析取XML事件信息
    titles, links = [], []
    doc.elements.each('ResultSet/Result/Title') do |element|  #获取Title值
      titles << element.text
    end
    doc.elements.each('ResultSet/Result/Url') do |element|  #获取Url值
      links << element.text
    end
    titles.each_with_index do |title, idx|
      print "#{title} => #{links[idx]}\n"
    end

 

示例输出：

 

Madonna => http://www.madonna.com/
Madonna - Wikipedia, the free encyclopedia => http://en.wikipedia.org/wiki/Madonna