ruby 批量下载王者荣耀皮肤

主要采用ruby Parallel库提供的多线程方式：

require 'unirest'
require 'open-uri'
require 'parallel'
require 'json'

url = 'http://pvp.qq.com/web201605/js/herolist.json'
response = Unirest.get(url)
/(\[.*\])/ =~ response.body.force_encoding('utf-8')
hero_list = JSON $1
#返回ename, cname, skin_name组成的hash数组
hero_list.each do |hero|
  hero.select!{|key, _| key=='ename' || key == 'cname' || key == 'skin_name'}
  # hero.select!{|key, _| key =~ /[('ename')|('cname')|('skin_name')]/}
end

def download_hero_img(url, path, img_name)
  img_file = open(url,:ssl_verify_mode => OpenSSL::SSL::VERIFY_NONE){ |f| f.read }
  puts "download #{path}/#{img_name}.jpg"
  open("#{path}/#{img_name}.jpg", 'wb'){ |f| f.write(img_file)}
end

a = Proc.new{hero_list.pop || Parallel::Stop}
# 分成10个线程爬取
Parallel.map(a, in_threads:10) do |hero|
  path = "./#{hero['cname']}"
  Dir.mkdir(path) unless Dir.exists?(path)
  # url = "http://game.gtimg.cn/images/yxzj/img201606/heroimg/#{hero['ename']}/#{hero['ename']}"
  skin_list = hero['skin_name'].split('|')
  # puts skin_list
  skin_list.each_with_index do |skin, index|
    url = "https://game.gtimg.cn/images/yxzj/img201606/skin/hero-info/#{hero['ename']}/#{hero['ename']}-bigskin-#{index.to_i+1}.jpg"
    img_name = skin
    download_hero_img(url, path, img_name)
  end
end

线程参考资料：

Ruby 中的多进程与多线程

Parallel github

Parallel ruby的并行 多线程处理插件

多线程队列(Queue)下载博客文章到本地