我们可以通过SOAP服务器来访问预先定义好的对象，通过soap/rpc/driver就可做到，这也可以看作是同其他语言交互的一种很好的方式，服务器端存为server.rb

require 'soap/rpc/standaloneServer'

class InterestCalculator
  attr_reader :call_count
  def initialize
    @call_count=0
  end
  def compound(printcipal,rate,freq,years)
    @call_count+=1
    printcipal*(1.0+rate/freq)**(freq*years)
  end
end

NS='http://pragprog.com/InterestCalc'
class Server2<SOAP::RPC::StandaloneServer
  def on_init
    calc=InterestCalculator.new
    add_method(calc,'compound','printcipal','rate','freq','years')
    add_method(calc,'call_count')
  end
end
svr=Server2.new('Calc',NS,'0.0.0.0',12321)
trap('INT'){svr.shutdown}
svr.start


客户端代码存为client.rb
require 'soap/rpc/driver'
proxy=SOAP::RPC::Driver.new("http://localhost:12321","http://pragprog.com/InterestCalc")
proxy.add_method('compound','principle','rate','freq','years')
proxy.add_method('call_count')
puts "Call count: #{proxy.call_count}"
puts "5 years,compound annually: #{proxy.compound(100,0.06,1,5)}"
puts "5 years,compound monthly: #{proxy.compound(100,0.06,12,5)}"
puts "Call count: #{proxy.call_count}"

我们在服务器端输入

% ruby server.rb

以打开服务器

客户端中输入

%ruby client.rb

会显示

Call count:0

5 years,compound annually:133.8225776

.......