Rails(1)：生成PDF文档

如何生成PDF文档?

1，install
gem install pdf-writer 
2，require & register
# environment.rb 
require 'pdf/writer' 
Mime::Type.register 'application/pdf', :pdf 

3，use
# lib/product_drawer.rb 
def self.draw(products) 
 pdf = PDF::Writer.new 
 products.each do |product| 
  pdf.text product.name 
 end 
 pdf.render 
end 
 
# products_controller.rb 
def index 
 @products = Product.find(:all) 
 respond_to do |format| 
  format.html 
  format.pdf do 
send_data ProductDrawer.draw(@products), :filename => 'products.pdf', :type=> 'application/pdf', :disposition => 'inline' 
  end 
 end 
end 
 
# in view 
<p><%= link_to 'PDF Format', formatted_products_path(:pdf) %></p> 
 
# in browser 
<A href="http://localhost:3000/products.pdf" target=_blank>http://localhost:3000/products.pdf</A>

如果内容有中文为什么会显示乱码?