A Web service is a method of communication between two electronic devices over a network.They are the integral part of Mobile development. Web service are of various types SOAP, REST, and XML-RPC. For basics of webservices you can follow my blog Basics of Web Services.
In this post, I will show how to upload files from Android mobile devices to the server network using HttpURLConnection class.
A URLConnection with support for HTTP-specific features.
Refer the below link for complete sample code:-
Download Sample Code
Have a look on few code snippets,
//Async_ImageUpload.java
In this post, I will show how to upload files from Android mobile devices to the server network using HttpURLConnection class.
A URLConnection with support for HTTP-specific features.
- Obtain a new HttpURLConnection by calling URL.openConnection() and casting the result to HttpURLConnection.
- Prepare the request. The primary property of a request is its URI. Request headers may also include metadata such as credentials, preferred content types, and session cookies.
- Optionally upload a request body. Instances must be configured with setDoOutput(true) if they include a request body. Transmit data by writing to the stream returned by getOutputStream().
- Read the response. Response headers typically include metadata such as the response body's content type and length, modified dates and session cookies. The response body may be read from the stream returned by getInputStream(). If the response has no body, that method returns an empty stream.
- Disconnect. Once the response body has been read, the HttpURLConnection should be closed by calling disconnect(). Disconnecting releases the resources held by a connection so they may be closed or reused.
Download Sample Code
Have a look on few code snippets,
//Async_ImageUpload.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 | package com.example.harshalbenake.imageupload; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.Uri; import android.net.http.AndroidHttpClient; import android.os.AsyncTask; import android.os.Environment; import android.util.Log; import android.widget.Toast; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.FileEntity; import org.apache.http.entity.InputStreamEntity; import org.apache.http.entity.StringEntity; import org.apache.http.entity.mime.MultipartEntity; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.util.EntityUtils; import org.json.JSONObject; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; /** * This async task is used to send ImageUpload to server. * Created by <b>Harshal Benake</b> on 10/11/15. */ public class Async_ImageUpload extends AsyncTask<String, String, String> { private MainActivity mActivity; ProgressDialog progressDialog = null; private ResponseManager mResponseManager; private String status; public Async_ImageUpload(MainActivity activity) { this.mActivity = activity; } @Override protected void onPreExecute() { super.onPreExecute(); if (isConnected(mActivity)) { progressDialog = new ProgressDialog(mActivity); progressDialog.setProgressStyle(android.R.attr.progressBarStyleLarge); progressDialog.setMessage("Loading"); progressDialog.show(); progressDialog.setCancelable(false); } else { System.out.println("Internet lost"); cancel(true); } } @Override public String doInBackground(String... params) { if (!isCancelled()) { try { sendPostDataRegistrationWS(); if (mResponseManager != null && mResponseManager.response != null && !mResponseManager.response.equalsIgnoreCase("")) { if (mResponseManager.status == ResponseManager.SC_OK) { System.out.println("Async_ImageUpload response: " + mResponseManager.response); JSONObject jsonObject = new JSONObject(mResponseManager.response); status = jsonObject.optString("status"); String message = jsonObject.optString("message"); if (status != null && status.equalsIgnoreCase("200")) { } return message; } } } catch (Exception e) { e.printStackTrace(); } } return null; } @Override protected void onPostExecute(String message) { super.onPostExecute(message); if (progressDialog != null && progressDialog.isShowing()) { progressDialog.dismiss(); } if (message != null && !message.equalsIgnoreCase("")) { System.out.println("message: " + message); } } /** * This method is use to check the device internet connectivity. * * @param context * @return true :if your device is connected to internet. * false :if your device is not connected to internet. */ public static boolean isConnected(Context context) { ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo info = manager.getActiveNetworkInfo(); if (info == null) return false; if (info.getState() != NetworkInfo.State.CONNECTED) return false; return true; } /** * This webservice method is used to send data to server. * * @return */ public ResponseManager sendPostDataRegistrationWS() { ResponseManager responseManager = new ResponseManager(); responseManager.status = ResponseManager.exception; responseManager.response = "Server Error"; try { final String strUrl = mActivity.getResources().getString(R.string.webservice_url); String strFilePath = Environment.getExternalStorageDirectory() + File.separator + "hb" + File.separator + "156" + ".jpg"; File file = new File(strFilePath); HttpURLConnection httpURLConnection = null; DataOutputStream dataOutputStream = null; String lineEnd = "\r\n"; String twoHyphens = "--"; String boundary = "*****"; int maxBufferSize = 1 * 2048 * 2048; // open a URL connection to the Servlet FileInputStream fileInputStream = new FileInputStream(file); URL url = new URL(strUrl); // Open a HTTP connection to the URL httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setDoInput(true); // Allow Inputs httpURLConnection.setDoOutput(true); // Allow Outputs httpURLConnection.setUseCaches(false); // Don't use a Cached Copy httpURLConnection.setRequestMethod("POST"); httpURLConnection.setRequestProperty("Connection", "Keep-Alive"); httpURLConnection.setRequestProperty("ENCTYPE", "multipart/form-data"); httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary); httpURLConnection.setRequestProperty("UploadedImage", file.getName()); // conn.setRequestProperty("Params","Registration"); dataOutputStream = new DataOutputStream(httpURLConnection.getOutputStream()); //first parameter - type dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd); dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"parameter\"" + lineEnd + lineEnd + "parameter" + lineEnd); //uploaded_file parameter - UploadedImage dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd); dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\"" + file.getName() + "\"" + lineEnd); dataOutputStream.writeBytes(lineEnd); // create a buffer of maximum size int bytesAvailable = fileInputStream.available(); int bufferSize = Math.min(bytesAvailable, maxBufferSize); byte[] buffer = new byte[bufferSize]; // read file and write it into form... int bytesRead = fileInputStream.read(buffer, 0, bufferSize); while (bytesRead > 0) { dataOutputStream.write(buffer, 0, bufferSize); bytesAvailable = fileInputStream.available(); bufferSize = Math.min(bytesAvailable, maxBufferSize); bytesRead = fileInputStream.read(buffer, 0, bufferSize); } // send multipart form data necesssary after file data... dataOutputStream.writeBytes(lineEnd); dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); //close the streams // fileInputStream.close(); dataOutputStream.flush(); dataOutputStream.close(); // Execute HTTP Post Request String strResponse = httpURLConnection.getResponseMessage(); System.out.println("response " + ": " + strResponse); int statusCode = httpURLConnection.getResponseCode(); if (statusCode == HttpStatus.SC_OK) { responseManager.status = statusCode; responseManager.response = strResponse; responseManager.message = ""; } else { responseManager.status = statusCode; responseManager.response = ResponseManager.handledResponseMessage(mActivity, statusCode); responseManager.message = ResponseManager.handledResponseMessage(mActivity, statusCode); } return responseManager; } catch (Exception e) { e.printStackTrace(); } return responseManager; } } |
