rails上传图片代码实例

class WritePic
require "RMagick"
require "uuid"
def self.write(pic_data,ori_name,resize = nil,file_type = "jpg",tag=false)
#File.delete("c:/programData/ruby-uuid") if RAILS_GEM_VERSION == '2.1.2'
uuid = ori_name || "#{UUID.new.generate}.#{file_type}"
i = Magick::Image.from_blob(pic_data).first
if resize
p=resize[:width].to_i*1.00 /i.columns
i.resize!(resize[:width],resize[:height]|| i.rows*p)
end
wh=0
width = i.columns
height = i.rows
if width > height
wh =1
end
i.write("#{RAILS_ROOT}/public/images/user_pic/#{uuid}")
if tag
return wh,uuid
else
return uuid
end
end
def self.get_pic(url)
uuid = "#{UUID.new.generate}.#{file_type}"
img_orig1 = Magick::Image.read(url).first
image1 = img_orig1.resize_to_fit(300,300)
image1.write("#{RAILS_ROOT}/public/images/weibo_pic/#{uuid}")
return uuid
end
end

class Theme ActiveRecord::Base
require "RMagick"
require "uuid"
def _image=(picture_field)
if picture_field != ""
self.image = WritePic.write(picture_field.read,self.image,nil)
end
end
def _image
self.image
end
def suoluetu=(picture_field)
if picture_field != ""
self.thumbnail = WritePic.write(picture_field.read,self.thumbnail,nil,"png")
end
end
def suoluetu
self.thumbnail
end
end

h1>New theme/h1>
% form_for(@theme,:html=>{:multipart=>'true'}) do |f|%>
%= f.error_messages %>

p>
%= f.label :name %>br />
%= f.text_field :name %>
/p>
p>
%= f.label :color %>br />
%= f.text_field :color %>
/p>
p>
%= f.label :lastcolor %>br />
%= f.text_field :lastcolor %>
/p>
p>
%= f.label :image %>br />
%= f.file_field :_image %>
/p>
p>
%= f.label :thumbnail %>br />
%= f.file_field :suoluetu %>
/p>
p>
%= f.submit "Create" %>
/p>
% end %>

%= link_to 'Back', themes_path %>