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How do i parse content sent from multipart/form-data request to get file in java?

I am sending a HttpURLConnection request to server and trying to send a file. I am able to send file from client side but not sure how can i parse it on the server side.
My code on client side is below.
private void createRequestInCHESS(String sRequestId, String sLastUpdated) {
String boundary = "xyz";
String crlf = "\r\n";
String twoHyphens = "--";
String attachmentName = "file";
String attachmentFileName = "testFile.xlsx";
try {
File file = new File("c:\\MFGREQ-7.xlsx");
URL url = new URL(chess.getMfgRequestURL() + "/createRequest");
HttpURLConnection httpConnecton = (HttpURLConnection) url.openConnection();
httpConnecton.setRequestMethod(REQUEST_METHOD_POST);
httpConnecton.setRequestProperty("Accept", "application/json");
httpConnecton.setRequestProperty("Cache-Control", "no-cache");
httpConnecton.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
httpConnecton.setRequestProperty("id", sRequestId);
httpConnecton.setRequestProperty("lastModified", sLastUpdated);
httpConnecton.setDoOutput(true);
DataOutputStream outStream = new DataOutputStream(httpConnecton.getOutputStream());
outStream.writeBytes(twoHyphens + boundary + crlf);
outStream.writeBytes("Content-Disposition: form-data; name=\"" +
attachmentName + "\";filename=\"" + attachmentFileName + "\"" + crlf);
outStream.writeBytes(crlf);
byte[] bytes = Files.readAllBytes(file.toPath());
outStream.write(bytes);
outStream.flush();
outStream.close();
getResponseString(httpConnecton);
} catch (MalformedURLException me) {
me.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
server side code is given below. What can I use to retrive file sent from request.
#POST
#Path("/createRequest")
public Response createRequest(#Context HttpServletRequest request) {
try(BufferedReader reader = new BufferedReader(
new InputStreamReader(request.getInputStream()))) {
StringBuilder sbPayload = new StringBuilder();
String sLine;
while ((sLine = reader.readLine()) != null) {
sbPayload.append(sLine);
sbPayload.append(System.lineSeparator());
}
String data = sbPayload.toString();
// how do i retrieve file here ?
}

You really don't want to parse that yourself. Use the https://commons.apache.org/proper/commons-fileupload/
Then you can just write.
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8"); // Might be needed, depending on exact setup.
java.util.List<FileItem> items = upload.parseRequest(request);
And then items is the list of uploaded files.

Here is my answer. I have used org.glassfish.jersey.media.multipart.MultiPart on client side.
Client client = ClientBuilder.newBuilder().register(MultiPartFeature.class).build();
WebTarget webTarget = client.target(chess.getMfgRequestURL() + "/createRequest")
.queryParam("id", sRequestId)
.queryParam("lastModified", sLastUpdated);
FileDataBodyPart fileDataBodyPart = new FileDataBodyPart("file",
file, MediaType.APPLICATION_OCTET_STREAM_TYPE);
#SuppressWarnings("resource")
MultiPart multiPart = new FormDataMultiPart()
.field("json", jsonObj, MediaType.APPLICATION_JSON_TYPE) // json goes here
.bodyPart(fileDataBodyPart); // file goes here
multiPart.bodyPart(fileDataBodyPart);
Response response = webTarget.request(MediaType.APPLICATION_JSON_TYPE)
.post(Entity.entity(multiPart, multiPart.getMediaType()));
On server side, this is how I have parsed:
#POST
#Path("/createRequest")
#Consumes("multipart/form-data")
public Response createRequest(#Context HttpServletRequest request, #Multipart InputStream uploadedInputStream) throws Exception {
JsonObjectBuilder requestBuilder = null;
try {
String tempDir = "C:\\Users";
String filename = "test.xlsx";
File checkinFile = new File(tempDir, filename);
OutputStream out = new FileOutputStream(checkinFile);
IOUtils.copyStream(uploadedInputStream, out);
}catch (Exception e) {
String errorMessage = e.getMessage();
return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(errorMessage).build();
}

I want to download a file from the frontend, need to send input stream to the frontend. Using download link to download file from backend

The code below uses a protected url ,username password to get the files to download. I can only manage to download the file in the springboot folder. I want to send the file data to the frontend to have it download there to your downloads.
I might be wrong but I need to send the inputstream to the frontend, then download that data to a file? Any suggestions as to what I am doing wrong when trying to send this data to the frontend.
#RequestMapping(value = "/checkIfProtectedOrPublic/", method = RequestMethod.POST)
public ResponseEntity checkIfProtectedOrPublic(#RequestPart("prm_main") #Valid CheckProtectedData checkProtectedData) throws IOException {
List<PrmMain> prmMainList = prmMainRepository.findAllByCode("PROTECTED_LOGIN");
boolean success = true;
InputStream in = null;
FileOutputStream out = null;
for (int i = 0; i < prmMainList.size(); i++) {
if (prmMainList.get(i).getData().get("email").equals(checkProtectedData.getEmail())) {
String username= (String) prmMainList.get(i).getData().get("email");
String password= (String) prmMainList.get(i).getData().get("password");
try{
URL myUrl = new URL(checkProtectedData.getDownloadLink());
HttpURLConnection conn = (HttpURLConnection) myUrl.openConnection();
conn.setDoOutput(true);
conn.setReadTimeout(30000);
conn.setConnectTimeout(30000);
conn.setUseCaches(false);
conn.setAllowUserInteraction(false);
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestMethod("GET");
String userCredentials = username.trim() + ":" + password.trim();
String basicAuth = "Basic " + new String(Base64.encode(userCredentials.getBytes()));
conn.setRequestProperty ("Authorization", basicAuth);
in = conn.getInputStream();
out = new FileOutputStream(checkProtectedData.getFileName());
int c;
byte[] b = new byte[1024];
while ((c = in.read(b)) != -1){
out.write(b, 0, c);
}
}
catch (Exception ex) {
success = false;
}
finally {
if (in != null)
try {
in.close();
} catch (IOException e) {
}
if (out != null)
try {
out.close();
} catch (IOException e) {
}
}
}
}
return ResponseEntity.of(null);
}

//Complete redo of the code
PrmMain loginParameter = prmMainRepository.findAllByCode("PROTECTED_LOGIN").get(0);
if (loginParameter == null)
throw new IllegalArgumentException("Protected Login Not Configured");
// now try and download the file to a byte array using commons - this bypasses CORS requirements
HttpGet request = new HttpGet(checkProtectedData.getDownloadLink());
String login = String.valueOf(loginParameter.getData().get("email"));
String password = String.valueOf(loginParameter.getData().get("password"));
CredentialsProvider provider = new BasicCredentialsProvider();
provider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials(login, password));
try
(
CloseableHttpClient httpClient = HttpClientBuilder.create().setDefaultCredentialsProvider(provider).build();
CloseableHttpResponse response = httpClient.execute(request)
)
{
// if there was a failure send it
if (response.getStatusLine().getStatusCode() != HttpStatus.OK.value())
return new ResponseEntity<>(HttpStatus.valueOf(response.getStatusLine().getStatusCode()));
// send back the contents
HttpEntity entity = response.getEntity();
if (entity != null)
{
// return it as a String
HttpHeaders header = new HttpHeaders();
header.setContentType(MediaType.parseMediaType(entity.getContentType().getValue()));
header.setContentLength(entity.getContentLength());
header.set("Content-Disposition", "attachment; filename=" + checkProtectedData.getFileName());
return new ResponseEntity<>(EntityUtils.toByteArray(entity), header, HttpStatus.OK);
}
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
FRONTEND
export async function DownloadFile(url, request) {
axios({
url: `${localUrl + url}`, //your url
method: 'POST',
data: request,
responseType: 'blob', // important
}).then((response) =>
{
fileSaver.saveAs(new Blob([response.data]), request.fileName);
return true;
}).catch(function (error)
{
console.error('Failed ', error);
console.error('Failed ', error); console.log('Failed ', error);
}
);
}

How to get response from HttpPost

I want to get response from the httppost request. I get the network response like 200,405,404 but i don't get the value which is coming from server. I am trying a lot but i don't get response. Please help...
My code is below-
private void UploadPost() {
SharedPreferences sharedPreferences1 = getSharedPreferences("DATA", Context.MODE_PRIVATE);
String ID = sharedPreferences1.getString("id", "");
#SuppressWarnings("deprecation")
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Url.addOffer_url);
Log.e("uploadFile", "Source File Path " + picturePath);
File sourceFile1 = new File(picturePath);
if (!sourceFile1.isFile()) {
Log.e("uploadFile", "Source File Does not exist");
imgUploadStatus = "Source File Does not exist";
}
try {
AndroidMultiPartEntity entity = new AndroidMultiPartEntity();
File sourceFile = new File(picturePath);
MultipartEntity entity1 = new MultipartEntity(
HttpMultipartMode.BROWSER_COMPATIBLE);
// Adding file data to http body
entity.addPart("retailer_id", new StringBody(ID));
entity.addPart("title", new StringBody(addoffertitle));
entity.addPart("description", new StringBody(addofferdesc));
entity.addPart("keyword", new StringBody(addofferkeyword));
entity.addPart("offer_id", new StringBody(OfferListing_Id));
// entity.addPart("payment_status",new StringBody(paymentStatus));
// if(!picturePath.equals(""))
entity.addPart("offer_image", new FileBody(sourceFile));
/* else
entity.addPart("old_pic",new StringBody(Image_Path));*/
httppost.setEntity(entity);
Log.d("httppost success", "httppost");
//Run a api for net conn check
try {
String responseString= new String();
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity8 = response.getEntity();
if(entity8 !=null){
responseString = EntityUtils.toString(entity8, "UTF-8");
System.out.println("Response body: " + responseString);
}
statusCode = 200;
} catch (FileNotFoundException e) {
Log.e("log_tag1", "Error FileNotFoundException new service" + e.toString());
result = "FileNotFoundException";
} catch (SocketTimeoutException e) {
Log.e("log_tag2", "SocketTimeoutException new service " + e.toString());
result = "SocketTimeoutException";
} catch (Exception e) {
Log.e("log_tag3", "Error converting OtherException new service " + e.toString());
result = "OtherException";
}
if (statusCode == 200) {
// Server response
responseString = "success";
Log.e("complete success", "Response from server: " + responseString);
} else if (statusCode == 404) {
responseString = "page not found";
Log.e("complete page not found", "Response from server: " + responseString);
} else if (statusCode == 405) {
responseString = "no net";
Log.e("complete no net", "Response from server: " + responseString);
} else {
responseString = "other";
Log.e("complete other", "Response from server: " + responseString);
}
} catch (Exception e) {
responseString = e.toString();
responseString = "other";
Log.e("complete", "Response from server: " + responseString);
}
}
I want to response from the httppost.i get the network response but i don't get the value which is coming from server.I am trying a lot but i don't get response.Please help...

Try using EntityUtils instead of the BufferedReader. For instance, something like:
String responseString= new String();
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if(entity !=null){
responseString = EntityUtils.toString(entity, "UTF-8");
}
Look at the selected answer here - it shows how to get response body for a 400-HTTP response. You can also look at this example. If you are working with JSON payload, perhaps you might want to consider using Volley - here are some examples for PUT, POST, and GET requests using Volley

You can try this
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);
}
Instead of
HttpEntity entity8 = response.getEntity();
if(entity8 !=null){
responseString = EntityUtils.toString(entity8, "UTF-8");
System.out.println("Response body: " + responseString);
}

Android Unable to Retrieve JSON response [SC_406]

I have the code which basically retrieving a list of search result based on given keyword from TMDB (API ver.3, new API).
public String getPersonSearchResult(String keywords){
String query = URLEncoder.encode(keywords);
String TMDB_API_URL = "http://api.themoviedb.org/3/search/person?";
String TMDB_LIMIT_LIST = "&page=1";
String TMDB_QUERY = "&query=" + query;
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
String responseString = null;
try
{
// ATTEMPT HTTP REQUEST
String fullUrl = TMDB_API_URL + TMDB_API_KEY + TMDB_QUERY + TMDB_LIMIT_LIST;
Log.w(APP_TAG, "TRYING [" + fullUrl + "]");
response = httpclient.execute(new HttpGet(fullUrl));
StatusLine statusLine = response.getStatusLine();
if (statusLine.getStatusCode() == HttpStatus.SC_OK)
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
response.getEntity().writeTo(out);
out.close();
responseString = out.toString();
}else{
// FAILED REQUEST - CLOSE THE CONNECTION
response.getEntity().getContent().close();
throw new IOException(statusLine.getReasonPhrase());
}
}catch(Exception e){
Log.w(APP_TAG, e.getLocalizedMessage());
Log.w(APP_TAG, "FAILED TO RETRIEVE JSON DATA");
}
return responseString;
}
The problem is that i always get 406 Status Code (Not Acceptable). When i tried to run the URL myself
http://api.themoviedb.org/3/search/person?api_key=<MY_API_KEY_HERE>&query=jennifer&page=1
It displays the JSON result correctly.
I am not sure why is this happening. Similar function is used to retrieve JSON value from other source and and it works perfectly.
this is their API docs regarding search: http://docs.themoviedb.apiary.io/#search
Can anyone points me to the right direction? Any help is appreciated.

I figure it out, by adding this:
HttpGet getObj = new HttpGet(fullUrl);
getObj.addHeader("Accept", "application/json");
Perhaps this is API specific requirement. Not sure though...

One way to do it
Try using builder.scheme
URIBuilder builder = new URIBuilder();
builder.setScheme("http").setHost("api.themoviedb.org").setPath("/3/search/person")
.setParameter("api_key", YOURAPIKEY)
.setParameter("page", 1)
.setParameter("query", query)
URI uri = builder.build();
HttpGet httpget = new HttpGet(uri);
.....
response = httpclient.execute(new HttpGet(httpget ));

I think its nothing to do with your code.. your code is perfect. The only problem might be with the API request method. Maybe they require some specific headers to be requested for in the request. Give a try with requesting headers like "("Accept", "application/json")" It might work..

try this
String ret = null; try {
response = httpClient.execute(httpGet);
} catch (Exception e) {
e.printStackTrace();
}
try {
ret = EntityUtils.toString(response.getEntity());
} catch (IOException e) {
Log.e("HttpRequest", "" + e.getMessage());
} catch (Exception e) {
e.printStackTrace();
}
return ret;

How to build a http post request with the correct entity with Java and not using any library?

How should I build the entity to achieve this post request?
POST https://picasaweb.google.com/data/feed/api/user/userID/albumid/albumID/photoid/photoID
<entry xmlns='http://www.w3.org/2005/Atom'>
<content>great photo!</content>
<category scheme="http://schemas.google.com/g/2005#kind"
term="http://schemas.google.com/photos/2007#comment"/>
</entry>
It's from:
http://code.google.com/intl/zh-TW/apis/picasaweb/docs/2.0/developers_guide_protocol.html#AddComments
Could someone provide an example or any tips?
Many thanks.
UPDATE:
I added my code here:
List<Header> headers = new ArrayList<Header>();
headers.add(new BasicHeader("GData-Version", "2"));
headers.add(new BasicHeader("Authorization", "GoogleLogin auth=" + mAuthToken));
EntityTemplate entity = new EntityTemplate(new ContentProducer() {
public void writeTo(OutputStream ostream) throws IOException {
Writer writer = new OutputStreamWriter(ostream, "UTF-8");
writer.write("\r\n");
writer.write("<entry xmlns='http://www.w3.org/2005/Atom'>");
writer.write("<content>" + comment + "</content>");
writer.write("<category scheme=\"http://schemas.google.com/g/2005#kind\"\r\n");
writer.write("term=\"http://schemas.google.com/photos/2007#comment\"/>");
writer.write("</entry>\r\n");
writer.flush();
}
});
Still no luck. Any idea?

It is a sample code using HttpClient.
I hope this piece of information will be of help to you.
// yourID
String userID = "";
String albumID = "";
String photoID = "";
HttpPost postRequest = new HttpPost(
"https://picasaweb.google.com/data/feed/api/user/" + userID
+ "/albumid/" + albumID + "/photoid/" + photoID);
postRequest.addHeader(new BasicHeader("GData-Version", "2.0"));
postRequest.addHeader(new BasicHeader("Authorization",
"GoogleLogin auth=" + mAuthToken));
String content =
"<entry xmlns='http://www.w3.org/2005/Atom'>"
+ "<content>" + comment + "</content>"
+ "<category scheme='http://schemas.google.com/g/2005#kind'"
+ " term='http://schemas.google.com/photos/2007#comment'/>"
+ "</entry>";
try {
StringEntity entity = new StringEntity(content);
entity.setContentType(new BasicHeader("Content-Type",
"application/atom+xml"));
postRequest.setEntity(entity);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(postRequest);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

You can use "GDataAPI" and "Guava-libraries".
PicasawebService myService
= new PicasawebService("exampleCo-exampleApp-1"); // just id
myService.setUserCredentials(
"liz#gmail.com", "mypassword"); // your mailaddress, password
// change "username", "albumid" and "photoid"
URL feedUrl = new URL(
"https://picasaweb.google.com/data/feed/api/"
+ "user/username/albumid/albumid/photoid/photoid");
CommentEntry myComment = new CommentEntry();
myComment.setContent(
new PlainTextConstruct("great photo!")); // there is comment
myService.insert(feedUrl, myComment);
Refere to following URL.
http://code.google.com/intl/ja/apis/picasaweb/docs/2.0/developers_guide_java.html
http://code.google.com/p/gdata-java-client/downloads (GDataAPI Download)
http://code.google.com/p/guava-libraries/ (Guava-libraries)

You can use HttpClient from apache httpcomponents to create http requests.
Find the tutorials here.