使用Sinatra上传文件

this thread .

包括在这里以防链接消失:

post '/upload' do
  unless params[:file] &&
         (tmpfile = params[:file][:tempfile]) &&
         (name = params[:file][:filename])
    @error = "No file selected"
    return haml(:upload)
  end
  STDERR.puts "Uploading file, original name #{name.inspect}"
  while blk = tmpfile.read(65536)
    # here you would write it to its final location
    STDERR.puts blk.inspect
  end
  "Upload complete"
end

那么你的观点是这样的。这将使用HAML,但重要的是不要忘记在form元素中设置enctype,否则只会得到文件名而不是对象:

%form{:action=>"/upload",:method=>"post"   ,:enctype=>"multipart/form-data"}
  %input{:type=>"file",:name=>"file"}
  %input{:type=>"submit",:value=>"Upload"}

include FileUtils::Verbose

get '/upload' do
    erb :upload
end

post '/upload' do
    tempfile = params[:file][:tempfile] 
    filename = params[:file][:filename] 
    cp(tempfile.path, "public/uploads/#{filename}")
    'Yeaaup'
end

__END__

@@upload
<form action='/upload' enctype="multipart/form-data" method='POST'>
    <input name="file" type="file" />
    <input type="submit" value="Upload" />
</form>

if params[:file]
  filename = params[:file][:filename]
  tempfile = params[:file][:tempfile]
  target = "public/files/#{filename}"

  File.open(target, 'wb') {|f| f.write tempfile.read }
end

原件在 https://github.com/tbuehlmann/sinatra-fileupload 但是我的环境有一些配置问题。别忘了加上 enctype="multipart/form-data" method="POST" 在上传表格上。