android - 将图像从 Android(使用 Android 异步 Http 客户端)上传到 Rails 服务器(使用回形针)

Question

我正在尝试通过 http post 方法将图像文件从 Android 设备上传到 Rails 服务器。 但是张贴图片是行不通的。更具体地说，post 参数(包括图像文件)似乎没有正确发送。

我正在使用 Android 异步 Http 客户端 (http://loopj.com/android-async-http/) 从 android 发布图像，发布图像的代码是这样的。

public static void postImage(){
    RequestParams params = new RequestParams();
    params.put("picture[name]","MyPictureName");
    params.put("picture[image]",File(Environment.getExternalStorageDirectory().getPath() + "/Pictures/CameraApp/test.jpg"));
    AsyncHttpClient client = new AsyncHttpClient();
    client.post("http://x.x.x.x:3000/pictures/", params, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(String response) {
            Log.w("async", "success!!!!");
        }                                                                                                                                                                     
    }); 
}   

至于rails paperclip应用，我只是简单地使用脚手架和生成名为“pictures”的模型，并在其上添加回形针附件。模型和 Controller (接收请求)如下所示。

模型

class Picture < ActiveRecord::Base                                                                                                                                            
  attr_accessible :name, :image
  has_attached_file :image,
                    :styles => { :original => "480x480>", :thumbnail => "100x100>" },
                    :path => ':rails_root/public/system/pictures/image/:id_partition/:style_:filename'
end

Controller

# POST /pictures                                                                                                                                                              
# POST /pictures.json
def create
  @picture = Picture.new(params[:picture])

  respond_to do |format|
    if @picture.save
      format.html { redirect_to @picture, notice: 'Picture was successfully created.' }
      format.json { render json: @picture, status: :created, location: @picture }
    else
      format.html { render action: "new" }
      format.json { render json: @picture.errors, status: :unprocessable_entity }
    end
  end
end

当收到请求时，“rails server”控制台会说如下内容

Started POST "/pictures/" for y.y.y.y at 2012-09-03 18:23:00 +0900
Processing by PicturesController#create as HTML
  Parameters: {"picture"=>{"name"=>"PictureName"}}
   (0.1ms)  begin transaction
  SQL (0.5ms)  INSERT INTO "pictures" ("album_id", "created_at", "image_content_type", "image_file_name", "image_file_size", "image_updated_at", "name", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)  [["album_id", nil], ["created_at", Mon, 03 Sep 2012 09:23:00 UTC +00:00], ["image_content_type", nil], ["image_file_name", nil], ["image_file_size", nil], ["image_updated_at", nil], ["name", "PictureName"], ["updated_at", Mon, 03 Sep 2012 09:23:00 UTC +00:00], ["user_id", nil]]
[paperclip] Saving attachments.
   (11.0ms)  commit transaction
Redirected to http://x.x.x.x:3000/pictures/10                                                                                                                               
Completed 302 Found in 15ms (ActiveRecord: 11.6ms)

如您所见，仅发送了一个参数，未收到原始图像数据“picture[image]”参数。谁能帮帮我？

Answer 1

对不起，那是我的愚蠢错误。 我应该做的

params.put("picture[image]", new File(Environment.getExternalStorageDirectory().getPath() + "/Pictures/CameraApp/test.jpg"));

不是

params.put("picture[image]", File(Environment.getExternalStorageDirectory().getPath() + "/Pictures/CameraApp/test.jpg"));

应该使用新文件而不是文件

当使用Android Asynchronous Http Client (http://loopj.com/android-async-http/)时，我们不必关心MultipartEntity。 感谢所有回答我问题的人!!!!