一、Controller最上方添加 require 'csv'

二、方法里面添加

format.csv do        csv_string = CSV.generate do |csv|            csv << ["Name", "Created At"]            @people.each do |person|                csv << [person.name, person.created_at]            end        end        render :text => csv_string      end

最终代码：

require 'csv'class PeopleController < ApplicationController  def index    @people = Person.all    respond_to do |format|      format.html # index.html.erb      # 对应url http://localhost:222/people.json      format.json { render json: @people }      # 对应url http://localhost:222/people.xml      format.xml { render :xml => @people}      format.atom { @feed_title = "My event list" } # index.atom.builder      # 添加csv格式      format.csv do        csv_string = CSV.generate do |csv|            csv << ["Name", "Created At"]            @people.each do |person|                csv << [person.name, person.created_at]            end        end        render :text => csv_string      end    end  end

最后浏览器http://localhost:3000/people.csv 不过用excel打开UTF-8格式的csv汉字会显示乱码，需要转换为GBK