Jsoner

html = <<-eohtml
    <table id='example-table'>
      <thead>
        <tr>
          <th>First Name</th>
          <th>Last Name</th>
          <th>Points</th></tr>
      </thead>
      <tbody>
        <tr>
          <td>Jill</td>
          <td>Smith</td>
          <td>50</td></tr>
        <tr>
          <td>Eve</td>
          <td>Jackson</td>
          <td>94</td></tr>
        <tr>
          <td>John</td>
          <td>Doe</td>
          <td>80</td></tr>
        <tr>
          <td>Adam</td>
          <td>Johnson</td>
          <td>67</td></tr>
      </tbody>
    </table>
  eohtml

# Convert HTML table into Json

json = Jsoner.parse(html)

# output json => 
# 
#   [ {"First Name"=>"Jill", "Last Name"=>"Smith",   "Points"=>"50"},
#     {"First Name"=>"Eve",  "Last Name"=>"Jackson", "Points"=>"94"},
#     {"First Name"=>"John", "Last Name"=>"Doe",     "Points"=>"80"},
#     {"First Name"=>"Adam", "Last Name"=>"Johnson", "Points"=>"67"} ]

require 'open-uri'
# you must have table.html file and assign file path correctly.

table = Jsoner.parse(open('table.html'))

# output json => 
# 
#   [ {"First Name"=>"Jill", "Last Name"=>"Smith",   "Points"=>"50"},
#     {"First Name"=>"Eve",  "Last Name"=>"Jackson", "Points"=>"94"},
#     {"First Name"=>"John", "Last Name"=>"Doe",     "Points"=>"80"},
#     {"First Name"=>"Adam", "Last Name"=>"Johnson", "Points"=>"67"} ]

require 'open-uri'

table = Jsoner.parse(open('http://www.w3school.com.cn/tiy/t.asp?f=html_table_header'))

# output json => 
#
# [{"姓名"=>"Bill Gates", "电话"=>"555 77 855"}]