Question

我有一个Django端点：

urlpatterns = [
    path('store', views.store, name='store'),
]

这个观点：

def store(request):
    x = request.POST['x']
    y = request.POST['y']
    z = request.POST['z']
    timestamp = request.POST['timestamp']
    Data(x=x, y=y, z=z, timestamp=timestamp).store()
    return HttpResponse(status=200)

我需要从Android手机向该端点发出http请求。

我现在有这个代码，如何添加POST参数？

String endpoint = "http://192.168.1.33:8000/rest/store";
try { new uploadData().execute(new URL(endpoint)); }
catch (MalformedURLException e) { e.printStackTrace(); }

private class uploadData extends AsyncTask<URL, Integer, String> {

        String result;

        protected String doInBackground(URL... urls) {
            try {
                HttpURLConnection urlConnection = (HttpURLConnection) urls[0].openConnection();
                result = urlConnection.getResponseMessage();
                urlConnection.disconnect();
            }
            catch (IOException e) { result = "404"; }
            return result;
        }

        protected void onPostExecute(String result) {
            if (result.equalsIgnoreCase("OK")) {
                ((TextView) findViewById(R.id.http)).setText("Database Online");
                ((TextView) findViewById(R.id.http)).setTextColor(Color.GREEN);
            }
            else if (result.equalsIgnoreCase("FORBIDDEN")) {
                ((TextView) findViewById(R.id.http)).setText("No user for device");
                ((TextView) findViewById(R.id.http)).setTextColor(Color.RED);
            }
            else{
                ((TextView) findViewById(R.id.http)).setText("Can't reach server");
                ((TextView) findViewById(R.id.http)).setTextColor(Color.RED);
            }
        }
    }

如何将x，y，z和timestamp添加为POST参数？

Answer 1

假设数据是一个具有post参数的jsonObject：

 HttpURLConnection urlConnection = (HttpURLConnection) urls[0].openConnection();
 urlConnection.setRequestMethod("POST");
 setHeaders(postConn);
 String mData = data.toString();
 if (mData != null) {
        urlConnection.setDoOutput(true);
        urlConnection.setRequestProperty("Content-Length", Integer.toString(mData.length()));
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(postConn.getOutputStream(), "UTF-8");
        final PrintWriter out = new PrintWriter(outputStreamWriter, true);
        out.print(mData);
        out.close();

      }
 int result = urlConnection.getResponseMessage();
  InputStream in = null;
  if (result == HttpsURLConnection.HTTP_OK) {
    in = postConn.getInputStream(); // to get result
 }
 urlConnection.disconnect();

SetHeaders将是：

private void setHeaders(final HttpsURLConnection connection) {
    connection.addRequestProperty("Content-type", "application/json");
    // Add more headers
}

希望这会有所帮助!!

Answer 2

使用Retrofit。它为您简化了很多。

文档： http://square.github.io/retrofit/

教程： https://www.youtube.com/watch?v=R4XU8yPzSx0

几乎没有理由使用其他任何东西。如果它有用，请告诉我。

Answer 3

使用OkHttp

将implementation 'com.squareup.okhttp3:okhttp:3.10.0'添加到您的gradle

发送帖子请求使用

public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

String post(String url, String json) throws IOException {
  RequestBody body = RequestBody.create(JSON, json);
  Request request = new Request.Builder()
   .url(url)
   .post(body)
   .build();
  Response response = client.newCall(request).execute();
  return response.body().string();
}

查看文档here

Android发送POST参数

3 个答案: