在 ruby​​ on rails 如何从客户端获取数据（android）

Question

Android 作为客户端，我将数据从客户端发送到服务器端。Ruby on rails 作为服务器端，如何使用 post 方法从客户端获取数据。

我想从客户端获取数据到服务器端进行显示。 对于客户端，我有代码如何向服务器端发送数据，但在服务器端我不知道如何获取数据。

通过仅使用服务器端，我们必须创建 url，并且我们必须在客户端代码中使用该 url 来发送数据。

服务器端代码。

def load
    if signed_in?
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      @my_post = current_user.posts.new
    end
    @posts = Post.paginate(page: params[:page],:per_page => 10)
    @post = Post.new
  end


  def index
    @posts = Post.all
    respond_with(@posts) do |format|
      format.json { render json: @post_names = {:post => @posts.as_json(:only=> :content)} }
    end
  end 

  def show
    if signed_in?
      @post = Post.find(params[:id])
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      current_user.vote_for(@post)
    else
    @post = Post.find(params[:id])
    Guest.find(1).vote_for(@post)
    end
    @posts = Post.paginate(page: params[:page],:per_page => 10)  
    @guest = Guest.new
    @user = User.new
    @users = User.paginate(page: params[:page],:per_page => 10)
  end

  def create 
    @post = Post.new(params[:post])
    if @post.save
      @posts = Post.paginate(page: params[:page],:per_page => 10)
    else 
      @posts = Post.paginate(page: params[:page],:per_page => 10)
    end
    @guest = Guest.new
    @users = User.paginate(page: params[:page],:per_page => 10)

  end

  def my_prayer_create     
      @my_post = current_user.posts.new(params[:post])
      @post = Post.new(params[:post])
      @guest = Guest.new
      @user = User.new
      @users = User.paginate(page: params[:page],:per_page => 10)
      if @my_post.save
        flash[:notice] = "Prayer Successfully created."
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      else 
        flash[:notice] = "Error"
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      end
  end

  def edit
    if signed_in?    
    @my_post = current_user.posts.find(params[:id])
    else
    @post = Post.find(params[:id])
    end
  end

  def update
    if signed_in? 
      @my_post = current_user.posts.find(params[:id])
      if @my_post.update_attributes(params[:post])
        flash[:notice] = "Prayer Successfully updated."
        @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
      end
    else  
    @post = Post.find(params[:id])
    end
  end

  def destroy
    if signed_in? 
      @my_post = current_user.posts.find(params[:id])
      @users = User.paginate(page: params[:page],:per_page => 10)
      @guest = Guest.new
      @my_post.destroy
      flash[:notice] = "Prayer Successfully destroyed."
      @my_posts = current_user.posts.paginate(page: params[:page],:per_page => 10)
    end
  end

这是服务器端，如何从客户端获取数据。

我在这里也提到了我的客户端代码

public class HomeLayoutActivity extends Activity implements OnClickListener{

        private EditText value;
        private Button btn;
        private ProgressBar pb;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.home_layout);
            value=(EditText)findViewById(R.id.editText1);
            btn=(Button)findViewById(R.id.button1);
            pb=(ProgressBar)findViewById(R.id.progressBar1);
            pb.setVisibility(View.GONE);
            btn.setOnClickListener(this);
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.home_layout, menu);
            return true;
        }

        public void onClick(View v) {
            // TODO Auto-generated method stub
                if(value.getText().toString().length()<1){

                    // out of range
                    Toast.makeText(this, "please enter something", Toast.LENGTH_LONG).show();
                }else{
                    pb.setVisibility(View.VISIBLE);
                    new MyAsyncTask().execute(value.getText().toString());      
                }


        } 

        private class MyAsyncTask extends AsyncTask<String, Integer, Double>{

            @Override
            protected Double doInBackground(String... params) {
                // TODO Auto-generated method stub
                postData(params[0]);
                return null;
            }

            protected void onPostExecute(Double result){
                pb.setVisibility(View.GONE);
                Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
            }
            protected void onProgressUpdate(Integer... progress){
                pb.setProgress(progress[0]);
            }

            public void postData(String valueIWantToSend) {
                // Create a new HttpClient and Post Header
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost("http://localhost:3000/posts/create_a_post");

                try {
                    // Add your data
                    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    nameValuePairs.add(new BasicNameValuePair("content", valueIWantToSend));
                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                    //httppost.addHeader("Authorization","Basic "+authorization);
                    httppost.addHeader("Content-Type","application/x-www-form-urlencoded");
                    //httppost.setHeader("Content-Type", "application/json");
                    httppost.addHeader("Accept", "application/json");

                    // Execute HTTP Post Request
                    HttpResponse response = httpclient.execute(httppost);

                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                } catch (IOException e) {
                    // TODO Auto-generated catch block


                }
            }
        }
    }

如何从客户端获取数据，我必须在 ruby​​ on rails 中执行哪些代码

Answer 1

您不会将 Json 发送到服务器。

查看类似问题如何使用 Android 发送 Json 数据： How to send POST request in JSON using HTTPClient?

如果你的 Json 是正确的，你可以在 Rails 中使用params 方法访问你的数据，在普通的 web 请求和 android 客户端请求之间访问参数没有区别。

您无需更改 Rails 代码。使用 Http-Client 发出测试请求。

我为HttpRequester 的示例请求制作了屏幕截图：

参数 post[name] 和 post[user_id] 仅为示例，将其替换为您的属性。

您的开发服务器控制台在发送请求后应该有以下输出：

Started POST "/posts" for 127.0.0.1 at 2013-06-10 13:31:01 +0200
Processing by PostsController#create as HTML
  Parameters: {"post"=>{"name"=>"name", "user_id"=>"5"}}