How to upload large files on multi-user request in Java?

Question

I use this tutorial to upload large files, but it cannot even load 300 KB of file. It also does not download anything other than *.txt or *.log files. Need pointers that can help me upload large files regardless of file types.

Changed code sharing

 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 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) httpConn.setRequestProperty("User-Agent", "CodeJava Agent") httpConn.setRequestProperty("Test", "Bonjour") outputStream = httpConn.getOutputStream() writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), true) } 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() } 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() } public void addHeaderField(String name, String value) { writer.append(name + ": " + value).append(LINE_FEED) writer.flush() } 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 status code first int status = httpConn.getResponseCode() //<- Exception coming in this line java.io.IOException: Error writing to server 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 } static main(args) { String charset = "UTF-8"; File uploadFile1 = new File("C:\\1392943434245.xml"); String requestURL = "http://localhost:10060/testme"; try { MultipartUtility multipart = new MultipartUtility(requestURL, charset); multipart.addFilePart("fileUpload", uploadFile1); List<String> response = multipart.finish(); println("SERVER REPLIED:"); for (String line : response) { System.out.println(line); } } catch (IOException ex) { System.err.println(ex); } } } 

Answer 1

Have you verified that your HTTP server does not impose a size limit on requests? Is there enough memory and disk size? Perhaps the reason is not in your code.

Answer 2

Try this code, you can upload any type of file

 public class TryFile { public static void main(String[] ar) throws HttpException, IOException, URISyntaxException { // TODO Auto-generated method stub TryFile t=new TryFile(); t.method(); } public void method() throws HttpException, IOException, URISyntaxException { String url="<your url>"; String fileName="<your file name>"; HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); FileBody fileContent= new FileBody(new File(fileName)); StringBody comment = new StringBody("Filename: " + fileName); MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("file", fileContent); httppost.setEntity(reqEntity); System.out.println("post length"+reqEntity.getContentLength()); HttpResponse response = httpclient.execute(httppost); HttpEntity resEntity = response.getEntity(); System.out.println("end"+resEntity.getContentLength()); } } 

Answer 3

This is the working code to download the file:

 <jsp:useBean id="upBean" scope="session" class="javazoom.upload.UploadBean" > <jsp:setProperty name="upBean" property="filesizelimit" value="<%= 1024 * 1024%>" /> </jsp:useBean> 

try it,

  try { if (MultipartFormDataRequest.isMultipartFormData(request)) { MultipartFormDataRequest mrequest = new MultipartFormDataRequest(request); Hashtable files = mrequest.getFiles(); byte data[] = null; if ((files != null) && (!files.isEmpty())) { fileObj = (UploadFile) files.get("fileUpload"); m_imagename = fileObj.getFileName().trim(); //File type validator if (!Utility.isValiedFileName1(m_imagename)) { ERROR = "Invalid File Type"; response.sendRedirect("XXX.jsp");//response page return; } //file uploader method call if ((fileObj != null) && (fileObj.getFileName() != null)) { data = fileObj.getData(); //Java method for uploading result = imageUpload.copyImage(data);//depCode } } } } catch (Exception e) { SystemMessage.getInstance().writeMessage(" ERROR : " + e); } 

This is the part related to HTTP.

Answer 4

See here

We can upload any number of files of any size using plupload.