使用POST方法REST API进行android登录

Question

I am a beginner in android development and I am working on a android application with REST api for login. I have to use POST method for login. After going through the docs and sites, i tried to implement the below code, but It's giving "invalid post request" every time. I tried to debugge but wasn't able to find the reason. Can someone please help me with link to understand how can i implement this. We have to pass the JSON paramter {"username": "abc@test.com","password": "abctest"} (i guess that is general)

  HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost("http://beta.m-adaptive.com/login"); BasicNameValuePair usernameBasicNameValuePair = new BasicNameValuePair("username", paramUsername); BasicNameValuePair passwordBasicNameValuePair = new BasicNameValuePair("password", paramPassword); List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>(); nameValuePairList.add(usernameBasicNameValuePair); nameValuePairList.add(passwordBasicNameValuePair); try { UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList); httpPost.setEntity(urlEncodedFormEntity); try { HttpResponse httpResponse = httpClient.execute(httpPost); InputStream inputStream = httpResponse.getEntity().getContent(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); StringBuilder stringBuilder = new StringBuilder(); String bufferedStrChunk = null; while((bufferedStrChunk = bufferedReader.readLine()) != null){ stringBuilder.append(bufferedStrChunk); } return stringBuilder.toString(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); if(result.equals("working")){ Toast.makeText(getApplicationContext(), "working...", Toast.LENGTH_LONG).show(); }else{ Toast.makeText(getApplicationContext(), "Invalid POST request...", Toast.LENGTH_LONG).show(); } 

Answer 1

If you want to pass JSON as your only parameter, you have to use StringEntity instead of UrlEncodedFormEntity and send the whole string, like this:

HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://beta.m-adaptive.com/login");
httpPost.setEntity(new StringEntity(YOUR JSON));
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
try {
    HttpResponse httpResponse = httpClient.execute(httpPost);
    ...

Answer 2

May be this helps :

class PlaceOrder extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {

            // TODO Auto-generated method stub

            try {

                HttpClient httpClient = new DefaultHttpClient();

                HttpPost httpPst = new HttpPost(

                "yout_url");

                ArrayList<NameValuePair> parameters = new ArrayList<NameValuePair>(

                2);

                parameters.add(new BasicNameValuePair("username", "apple"));

                parameters.add(new BasicNameValuePair("pw", "apple"));

                parameters.add(new BasicNameValuePair("email",
                        "apple@gmail.com"));

                parameters.add(new BasicNameValuePair("name", "apple"));

                httpPst.setEntity(new UrlEncodedFormEntity(parameters));

                HttpResponse httpRes = httpClient.execute(httpPst);

                String str = convertStreamToString(
                        httpRes.getEntity().getContent()).toString();

                Log.i("mlog", "outfromurl" + str);

            } catch (UnsupportedEncodingException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            } catch (ClientProtocolException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            } catch (IOException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            return null;

        }

    }

    public static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));

        StringBuilder sb = new StringBuilder();

        String line = null;

        try {

            while ((line = reader.readLine()) != null) {

                sb.append(line + "\n");

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            try {

                is.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return sb.toString();

    }