How to use parameters with HttpPost

Question

I am using a RESTfull webservice with this methode:

@POST @Consumes({"application/json"}) @Path("create/") public void create(String str1, String str2){ System.out.println("value 1 = " + str1); System.out.println("value 2 = " + str2); } 

In my Android app I want to call this method. How do I give the correct values to the parameters using org.apache.http.client.methods.HttpPost;

I have noticed that I can use the annotation @HeaderParam and simply add headers to the HttpPost object. Is this the correct way? Doing it like:

httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("str1", "a value"); httpPost.setHeader("str2", "another value"); 

Using the setEntity methode on httpPost won't work. It only sets the parameter str1 with the json string. When using it like:

JSONObject json = new JSONObject(); json.put("str1", "a value"); json.put("str2", "another value"); HttpEntity e = new StringEntity(json.toString()); httpPost.setEntity(e); //server output: value 1 = {"str1":"a value","str2":"another value"}  

Answer 1

To set parameters to your HttpPostRequest you can use BasicNameValuePair, something like this :

    HttpClient httpclient;     HttpPost httpPost;     ArrayList<NameValuePair> postParameters;     httpclient = new DefaultHttpClient();     httpPost = new HttpPost("your login link");       postParameters = new ArrayList<NameValuePair>();     postParameters.add(new BasicNameValuePair("param1", "param1_value"));     postParameters.add(new BasicNameValuePair("param2", "param2_value"));      httpPost.setEntity(new UrlEncodedFormEntity(postParameters, "UTF-8"));      HttpResponse response = httpclient.execute(httpPost); 

Answer 2

You can also use this approach in case you want to pass some http parameters and send a json request:

(note: I have added in some extra code just incase it helps any other future readers)

public void postJsonWithHttpParams() throws URISyntaxException, UnsupportedEncodingException, IOException {      //add the http parameters you wish to pass     List<NameValuePair> postParameters = new ArrayList<>();     postParameters.add(new BasicNameValuePair("param1", "param1_value"));     postParameters.add(new BasicNameValuePair("param2", "param2_value"));      //Build the server URI together with the parameters you wish to pass     URIBuilder uriBuilder = new URIBuilder("http://google.ug");     uriBuilder.addParameters(postParameters);      HttpPost postRequest = new HttpPost(uriBuilder.build());     postRequest.setHeader("Content-Type", "application/json");      //this is your JSON string you are sending as a request     String yourJsonString = "{\"str1\":\"a value\",\"str2\":\"another value\"} ";      //pass the json string request in the entity     HttpEntity entity = new ByteArrayEntity(yourJsonString.getBytes("UTF-8"));     postRequest.setEntity(entity);      //create a socketfactory in order to use an http connection manager     PlainConnectionSocketFactory plainSocketFactory = PlainConnectionSocketFactory.getSocketFactory();     Registry<ConnectionSocketFactory> connSocketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()             .register("http", plainSocketFactory)             .build();      PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(connSocketFactoryRegistry);      connManager.setMaxTotal(20);     connManager.setDefaultMaxPerRoute(20);      RequestConfig defaultRequestConfig = RequestConfig.custom()             .setSocketTimeout(HttpClientPool.connTimeout)             .setConnectTimeout(HttpClientPool.connTimeout)             .setConnectionRequestTimeout(HttpClientPool.readTimeout)             .build();      // Build the http client.     CloseableHttpClient httpclient = HttpClients.custom()             .setConnectionManager(connManager)             .setDefaultRequestConfig(defaultRequestConfig)             .build();      CloseableHttpResponse response = httpclient.execute(postRequest);      //Read the response     String responseString = "";      int statusCode = response.getStatusLine().getStatusCode();     String message = response.getStatusLine().getReasonPhrase();      HttpEntity responseHttpEntity = response.getEntity();      InputStream content = responseHttpEntity.getContent();      BufferedReader buffer = new BufferedReader(new InputStreamReader(content));     String line;      while ((line = buffer.readLine()) != null) {         responseString += line;     }      //release all resources held by the responseHttpEntity     EntityUtils.consume(responseHttpEntity);      //close the stream     response.close();      // Close the connection manager.     connManager.close(); }