自己闲来无事，用mechanize做了一个可以下载校内相册照片的代码。

写的有些简陋。。。。主要是根据相册的地址来分析用户ID和相册ID，然后模拟请求相册页面，并提取所有照片，然后下载到本地的一个文件夹中。

ruby版本：ruby1.8.7 or ruby1.9.2
操作系统：windows 7

Linux下没有试过~不过应该也可以的：

#encoding: utf-8

require 'rubygems'

require 'mechanize'

class Renren
  def initialize(e,p)

    @agent = Mechanize.new

    @page = @agent.get('http://3g.renren.com/')

    @page = @page.form_with(:method => 'POST') do |r|

      r.email = e

      r.password = p

    end.submit

  end
  def fetch_other_photo(album_link,foldername)

    photo_urls = []

    puts Iconv.conv("gb2312", "utf-8", "开始分析相册地址.....")

    begin

      user_id,album_id = parse_album_uri(album_link)

    rescue

      puts Iconv.conv("gb2312", "utf-8", "您的相册地址不正确，请重新输入！")

      return

    end

    page = @agent.get("http://3g.renren.com/album/wgetalbum.do?id=#{user_id}&owner=#{album_id}")

    puts Iconv.conv("gb2312", "utf-8", "正在获取所有照片地址.....")

    loop do

      page.links_with(:href => /http:\/\/3g\.renren\.com\/album\/wgetphoto\.do?/).each do |link|

        photo = link.click

        photo_urls << photo.link_with(:text => "下载该图").href

      end

      break if page.link_with(:text => "下一页").nil?

      page = page.link_with(:text => "下一页").click

    end

    if photo_urls.length > 0

      puts Iconv.conv("gb2312", "utf-8", "开始下载相册.....")

      unless File.directory?("#{foldername}")

        Dir.mkdir("#{foldername}")

      end

      Dir.chdir("#{foldername}") do |path|

          photo_urls.each do |photo_url|

            @agent.get(photo_url) do |photo|

              puts Iconv.conv("gb2312","utf-8","正在保存文件#{photo.filename}……已经下载#{((photo_urls.index(photo_url)+1).to_f/photo_urls.length*100).to_i}%")

              photo.save

            end

          end

      end

      puts Iconv.conv("gb2312","utf-8","相册下载完毕.....")

    else

      puts Iconv.conv("gb2312","utf-8","相册内没有照片哟~")

    end

  end
  private
  def parse_album_uri(uri)

    uri = uri.chomp("#thumb")

    uri = uri.split("?")

    if uri.length > 1 and uri[1].include?("owner")

      uri = uri[1].split("&")

      user_id = uri[0].split("=")[1]

      album_id = uri[1].split("=")[1]

    else

      uri = uri[0].split("/")

      album_id = uri[4]

      user_id = uri[5].split("-")[1]

    end

    return user_id,album_id

  end

end
print Iconv.conv("gb2312","utf-8","用户名：")

username = gets.chomp()

print Iconv.conv("gb2312","utf-8","密码：")

password = gets.chomp()

renren = Renren.new(username,password)

loop do

  print Iconv.conv("gb2312","utf-8","粘贴相册地址：")

  uri = gets.chomp()

  renren.fetch_other_photo(uri, username)

  print Iconv.conv("gb2312","utf-8","按0退出程序，按其它键继续下载其它相册：")

  break if gets.chomp() == "0"

end