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Ruby Socket 程式設計入門：TCP 客戶端/伺服器、多線程與簡易網頁瀏覽器

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Socket 基礎概念

Socket 是雙向通訊端點，支援進程間通訊（同機或跨機）。Ruby 提供底層 TCPSocket/TCPServer 及高階 Net::HTTP 等函式庫。

簡易 TCP 客戶端

require 'socket'
hostname = 'localhost'
port = 2000
s = TCPSocket.open(hostname, port)
while line = s.gets
  puts line.chop
end
s.close

簡易 TCP 伺服器

require 'socket'
server = TCPServer.open(2000)
loop do
  client = server.accept
  client.puts(Time.now.ctime)
  client.puts "Closing the connection. Bye!"
  client.close
end

多線程伺服器

require 'socket'
server = TCPServer.open(2000)
loop do
  Thread.start(server.accept) do |client|
    client.puts(Time.now.ctime)
    client.puts "Closing the connection. Bye!"
    client.close
  end
end

簡易網頁瀏覽器 (原始 Socket)

require 'socket'
host = 'www.tutorialspoint.com'
port = 80
path = '/index.htm'
request = "GET #{path} HTTP/1.0\r\n\r\n"

socket = TCPSocket.open(host, port)
socket.print(request)
response = socket.read
headers, body = response.split("\r\n\r\n", 2)
print body

使用 Net::HTTP (推薦)

require 'net/http'
host = 'www.tutorialspoint.com'
path = '/index.htm'
http = Net::HTTP.new(host)
headers, body = http.get(path)
if headers.code == "200"
  print body
else
  puts "#{headers.code} #{headers.message}"
end