Post запрос java android

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Android — Send an HTTP(S) POST request

As a part of my ioPush Android application, I needed to send a POST request to a secure server. I found some examples over the Internet but nothing parametric.
Here is my code, with optional basic HTTP authentication and headers.

Packages importation

// Required for httpPost() method import java.io.InputStream; import java.net.URL; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import android.util.Base64; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.BufferedWriter; import java.io.OutputStreamWriter; import java.io.OutputStream; import java.net.HttpURLConnection; // Required for JSON handling import org.json.JSONException; import org.json.JSONObject; 

POST request

private HttpResultHelper httpPost(String urlStr, String user, String password, String data, ArrayListString[]> headers, int timeOut) throws IOException  // Set url URL url = new URL(urlStr); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); // If secure connection if (urlStr.startsWith("https"))  try  SSLContext sc; sc = SSLContext.getInstance("TLS"); sc.init(null, null, new java.security.SecureRandom()); ((HttpsURLConnection)conn).setSSLSocketFactory(sc.getSocketFactory()); > catch (Exception e)  Log.d(TAG, "Failed to construct SSL object", e); > > // Use this if you need basic authentication if ((user != null) && (password != null))  String userPass = user + ":" + password; String basicAuth = "Basic " + Base64.encodeToString(userPass.getBytes(), Base64.DEFAULT); conn.setRequestProperty("Authorization", basicAuth); > // Set Timeout and method conn.setReadTimeout(timeOut); conn.setConnectTimeout(timeOut); conn.setRequestMethod("POST"); conn.setDoOutput(true); if (headers != null)  for (int i = 0; i  headers.size(); i++)  conn.setRequestProperty(headers.get(i)[0], headers.get(i)[1]); > > if (data != null)  conn.setFixedLengthStreamingMode(data.getBytes().length); OutputStream os = conn.getOutputStream(); BufferedWriter writer = new BufferedWriter( new OutputStreamWriter(os, "UTF-8")); writer.write(data); writer.flush(); writer.close(); os.close(); > InputStream inputStream = null; try  inputStream = conn.getInputStream(); > catch(IOException exception)  inputStream = conn.getErrorStream(); > HttpResultHelper result = new HttpResultHelper(); result.setStatusCode(conn.getResponseCode()); result.setResponse(inputStream); return result; > 

How to call it
URL encoded with basic authentication

HttpResultHelper httpResult = httpPost("https://ioPush.net/app/api/getAuthToken", "**@ioPush.net", "**", null, null, 7000); BufferedReader in = new BufferedReader(new InputStreamReader(httpResult.getResponse())); String result = ""; String inputLine; while ((inputLine = in.readLine()) != null)  result += inputLine; > 

How to call it
JSON data with custom headers

 String result = ""; String inputLine; // JSON data JSONObject data = new JSONObject(); try  data.put("key1", "param1"); data.put("key2", param2); data.put("key3", "param3"); > catch (JSONException e)  e.printStackTrace(); > // Headers ArrayListString[]> headers = new ArrayList<>(); headers.add(new String[]"custom-header", "custom value">); headers.add(new String[]"Content-Type", "application/json">); httpResult = httpPost("https://url.ext/page", null, null, data.toString(), headers, 7000); BufferedReader in = new BufferedReader(new InputStreamReader(httpResult.getResponse())); while ((inputLine = in.readLine()) != null)  result += inputLine; > 

HttpResultHelpers
Mandatory class to return status code and response .

import java.io.InputStream; public class HttpResultHelper  private int statusCode; private InputStream response; public HttpResultHelper()  > public int getStatusCode()  return statusCode; > public void setStatusCode(int statusCode)  this.statusCode = statusCode; > public InputStream getResponse()  return response; > public void setResponse(InputStream response)  this.response = response; > > 

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How to Execute HTTP POST Requests in Android

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HTTP Post is part of a deprecated HTTP classes like org.apache.http and AndroidHttpClient as of Android 5.1. [1] X Research source Migrate your code to the HttpURLConnection classes which includes Posting functionality. HTTP Post is used in Java to request that a specific web server receive and store data submitted within a request form. The data is submitted and stored in name-value pairs. Examples of pairs include: email-your email address; username-your username; and password-your password.

Creating a Try Block and HttpURLConnection Object

 android:name="android.permission.INTERNET" /> 

try  //enter statements that can cause exceptions > 

URL url = new URL(“http://exampleurl.com/”); HttpURLConnection client = (HttpURLConnection) url.openConnection(); 

URL url = new URL(“http://exampleurl.com/”); HttpURLConnection client = null; try  client = (HttpURLConnection) url.openConnection(); > 

Posting the Output Request and Handling Exceptions

The setRequestProperty() function is used as the Accept-Encoding request header to disable automatic decompression.

client.setRequestMethod(“POST”); client.setRequestProperty(“Key”,”Value”); client.setDoOutput(true); 

OutputStream outputPost = new BufferedOutputStream(client.getOutputStream()); writeStream(outputPost); outputPost.flush(); outputPost.close(); 

client.setFixedLengthStreamingMode(outputPost.getBytes().length); client.setChunkedStreamingMode(0); 

catch(MalformedURLException error)  //Handles an incorrectly entered URL > catch(SocketTimeoutException error)  //Handles URL access timeout. > catch (IOException error)  //Handles input and output errors > 

finally  if(client != null) // Make sure the connection is not null. client.disconnect(); > 

Community Q&A

This method seems to be just a sample of what you should do in this point. You need then to do your own implementation to write data to the OutputStream. You can find a simple samples on internet explaining how to write different types of data to an OutputStream.

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The Android Manifest file presents the Android system with essential information about the app and is required for every app in its root directory. The INTERNET permission grants access to the API that opens the device’s network sockets.

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I’m receiving errors that the symbol cannot be resolved for the URL and HttpURLConnection objects. What packages am I supposed to import?

Android Studio can be set to automatically import packages once the symbols are references or pasted into the code. You can also manually add in the packages by typing in and without the book ended arrow symbols. To set Android Studio to automatically import packages, Windows and Linux users must click on File>Settings>Edti>General>Auto Import>Java and Mac users must click on Android Studio>Preferences. Change «Insert imports on paste» to all and mark «Add unambiguous imports on the fly» then save your changes.

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