rails3+ paperclip图片加水印
1. 新建项目,并移除index.htmlrails new paperclip-waterrm public/index.html
2. 修改Gemfile 添加paperclip
gem 'paperclip'
3. 新建asset
rails g scaffold asset ttile:string
4. 添加paperclip支持
rails g paperclip asset data
5. 新建 lib/paperclip_processors/watermark.rb，源文件在：
http://gist.github.com/raw/465088/3de6e4f50ff659b91ee094764af842968d4e0de3/watermark.rb
6. 修改asset.rb
require 'paperclip_processors/watermark'class Asset < ActiveRecord::Basehas_attached_file :data, :processors => [:watermark],:styles => { :original => { :geometry => '550x400>', :watermark_path => "#{Rails.root}/public/images/rails.png",#水印图片所在位置 :position => 'Center' ＃添加的水印在图片哪个位置 }}end
7. 修改 _form.html.erb,添加文件上传支持，并修改 show.html.erb,显示图片
<%= form_for(@asset,:html => {:multipart => true}) do |f| %>＃show.html.erb <p><%= @asset.title %></p><p><%=image_tag @asset.data.url() %></p>
8.运行迁移文件
rake db:migrate
9.修改routes.rb
root :to => "assets#index" resources :assets
10. 启动项目 测试
rails s
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