HttpURLConnection simple POST fichier multipart / formulaire-données de Android à google blobstore
J'ai très peu d'idée du fonctionnement du code HTML. Ce que je veux faire est exactement similaire au suivant mais sur Android
<body>
<form action="<%= some_url %>" method="post" enctype="multipart/form-data">
<input type="file" name="myFile">
<input type="submit" value="Submit">
</form>
</body>J'ai essayé le code suivant -
private static void postToUrl(String url_to_upload_on,
String file_name_with_ext, byte[] byteArray) {
String attachmentName = "file";
String attachmentFileName = file_name_with_ext;
String crlf = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
try{
URL url = new URL(url_to_upload_on);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty(
"Content-Type", "multipart/form-data;boundary=" + boundary);
DataOutputStream request = new DataOutputStream(
connection.getOutputStream());
request.writeBytes(twoHyphens + boundary + crlf);
request.writeBytes("Content-Disposition: form-data; name=\"" +
attachmentName + "\";filename=\"" +
attachmentFileName + "\"" + crlf);
request.writeBytes(crlf);
request.write(byteArray);
request.writeBytes(crlf);
request.writeBytes(twoHyphens + boundary +
twoHyphens + crlf);
request.flush();
request.close();
}catch(Exception e){
e.printStackTrace();
}
}
cela ne me donne pas d'erreurs directes mais quand j'obtiens error-stream using-
Log.w(TAG, "connection.getErrorStream() = " + connection.getErrorStream());
j'ai compris-
12-14 18:25:54.911: W/uploadToBlobStore(30558): httpUrlConnection.getErrorStream() = com.Android.okhttp.internal.http.HttpTransport$FixedLengthInputStream@426dd5a8
sans succès.
PS- Je télécharge un fichier sur Google Blobstore
PS- Je ne peux pas utiliser les bibliothèques http Apache ou sa classe en plusieurs parties sous la forme Android dit que sa valeur est dépréciée
EDIT 1
Maintenant, j'utilise le code suivant, mais il ne fonctionne que pour les fichiers de moins de 2,3 Mo -
private static void postToUrl3(String url_to_upload_on,
String file_name_with_ext, byte[] byteArray, String mimeType) {
CloseableHttpClient httpClient = null;
try {
httpClient = HttpClientBuilder.create().build();
HttpPost postRequest = new HttpPost(url_to_upload_on);
MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create();
reqEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
ByteArrayBody bab = new ByteArrayBody(byteArray, file_name_with_ext);
reqEntity.addPart("file", bab);
postRequest.setEntity(reqEntity.build());
httpClient.execute(postRequest);// takes time
} catch (Exception e) {
Log.w("uploadToBlobStore", "postToUrl Exception e = " + e);
e.printStackTrace();
} finally {
if (httpClient != null) {
Log.w("uploadToBlobStore", "connection.closing ");
try {
httpClient.close();
} catch (IOException e) {
Log.w("uploadToBlobStore", "connection.closing errot e = "
+ e);
e.printStackTrace();
}
}
}
}
comment le faire fonctionner avec des fichiers plus volumineux?
PS - Je l'envoie à Blobstore et j'ai paramétré le maxUploadSizeByteset MaxUploadSizeBytesPerBlob à 30 Mo. Je ne suis pas en mesure de comprendre le problème de taille, car la documentation de Google blobstore dit -
Google App Engine inclut le service Blobstore, qui permet aux applications de servir des objets de données limités uniquement par la quantité de données pouvant être téléchargées ou téléchargées via une seule connexion HTTP.
Alors peut-il y avoir un problème avec la connexion http? et si oui, comment puis-je le configurer.
J'utilise HttpURLConnection pour y parvenir.
Créer une classe personnalisée multipart ::
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
*
* @param requestURL
* @param charset
* @throws IOException
*/
public MultipartUtility(String requestURL, String charset)
throws IOException {
this.charset = charset;
// creates a unique boundary based on time stamp
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true); // indicates POST method
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the request
*
* @param name field name
* @param value field value
*/
public void addFormField(String name, String value) {
writer.append("--" + boundary).append(LINE_FEED);
writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
.append(LINE_FEED);
writer.append("Content-Type: text/plain; charset=" + charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
/**
* Adds a upload file section to the request
*
* @param fieldName name attribute in <input type="file" name="..." />
* @param uploadFile a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
writer.append("--" + boundary).append(LINE_FEED);
writer.append(
"Content-Disposition: form-data; name=\"" + fieldName
+ "\"; filename=\"" + fileName + "\"")
.append(LINE_FEED);
writer.append(
"Content-Type: "
+ URLConnection.guessContentTypeFromName(fileName))
.append(LINE_FEED);
writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
writer.append(LINE_FEED);
writer.flush();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
/**
* Adds a header field to the request.
*
* @param name - name of the header field
* @param value - value of the header field
*/
public void addHeaderField(String name, String value) {
writer.append(name + ": " + value).append(LINE_FEED);
writer.flush();
}
/**
* Completes the request and receives response from the server.
*
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public List<String> finish() throws IOException {
List<String> response = new ArrayList<String>();
writer.append(LINE_FEED).flush();
writer.append("--" + boundary + "--").append(LINE_FEED);
writer.close();
// checks server's status code first
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
response.add(line);
}
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return response;
}
}
tilisez-le (manière asynchrone) ::
MultipartUtility multipart = new MultipartUtility(requestURL, charset);
// In your case you are not adding form data so ignore this
/*This is to add parameter values */
for (int i = 0; i < myFormDataArray.size(); i++) {
multipart.addFormField(myFormDataArray.get(i).getParamName(),
myFormDataArray.get(i).getParamValue());
}
//add your file here.
/*This is to add file content*/
for (int i = 0; i < myFileArray.size(); i++) {
multipart.addFilePart(myFileArray.getParamName(),
new File(myFileArray.getFileName()));
}
List<String> response = multipart.finish();
Debug.e(TAG, "SERVER REPLIED:");
for (String line : response) {
Debug.e(TAG, "Upload Files Response:::" + line);
// get your server response here.
responseString = line;
}
utilisez okhttp et utilisez l'extrait suivant (tiré de recettes )
ajustez les valeurs d'en-tête en fonction des attentes de votre serveur.
private static final String IMGUR_CLIENT_ID = "...";
private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
private final OkHttpClient client = new OkHttpClient();
public void run() throws Exception {
// Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
RequestBody requestBody = new MultipartBuilder()
.type(MultipartBuilder.FORM)
.addPart(
Headers.of("Content-Disposition", "form-data; name=\"title\""),
RequestBody.create(null, "Square Logo"))
.addPart(
Headers.of("Content-Disposition", "form-data; name=\"image\""),
RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
.build();
Request request = new Request.Builder()
.header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
.url("https://api.imgur.com/3/image")
.post(requestBody)
.build();
Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
System.out.println(response.body().string());
}
Vous pouvez également utiliser Retrofit.
Vous pouvez spécifier un appel comme ceci:
@Multipart
@POST("/user/photo")
Call<User> updateUser(@Part("photo") RequestBody photo, @Part("description") RequestBody description);
puis créez le comme ceci:
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://api.github.com")
.build();
GitHubService service = retrofit.create(GitHubService.class);
et enfin l'exécuter comme ça:
service.updateUser(Photo, description).enqueue() -> asynchrone
service.updateUser(Photo, description).execute() -> synchrone
Voir la documentation ici