I am trying to write/read files in JavaFX while using the Gluon plugin, and I am not having any luck. If i run the program as a Desktop App, it works fine, I've even used the same functions in Android IDE and it works fine, however if I send the program to my phone with Gluon, it does not work. I wanting to know how to save/read to files in Gluon, and what have I done wrong, and why does it work as Desktop and on Android but not Gluon. The two fcns I used are:
public void writeToFile() {
try {
FileOutputStream f = new FileOutputStream("Meal1_Protein.txt");
f.write(choice.getBytes()); //Choice is input from a dropdown
f.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Toast toast = new Toast(choice);
toast.show();
}
public void readFromFile(){
try {
FileInputStream f = new FileInputStream("Meal1_Protein.txt");
InputStreamReader is = new InputStreamReader(f);
BufferedReader br = new BufferedReader(is);
StringBuffer buff = new StringBuffer();
String lines;
while((lines = br.readLine())!=null){
buff.append(lines);
buff.append("\n");
}
carbInput.setText(buff.toString()); // inserting into a txtfield
//to see if it I can read strings back in.
Toast toast = new Toast(buff.toString());
toast.show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
I have an upload image function that uploads images to the server but I am only able to add images into the server until the session ends. Once the session ends , I noticed that the images uploaded are not stored into my local solution and after some research I found out that we could make uploaded files be stored into our solution even when the session ends but I am unsure of how to implement it. I am very new to this and would appreciate all help given.
For now this is the code I have that allows me to upload my image:
protected void btnConfirm_Click(object sender, EventArgs e)
{
string uploadedPhoto = "";
if (uploadImage.HasFile)
{
string savePath;
//Find the filename extension of the file to be uploaded.
string fileExt = Path.GetExtension(uploadImage.FileName);
//rename the uploaded file with name
uploadedPhoto = txtName.Text + fileExt;
savePath = MapPath("~/Images/profile pictures/" + uploadedPhoto);
try
{
uploadImage.SaveAs(savePath);
lblMsg.Text = "Image uploaded!";
imgprw.ImageUrl = "~/Images/profile pictures/" + uploadedPhoto;
}
catch (IOException)
{
lblMsg.Text = "Image upload failed!";
}
catch (Exception ex)
{
lblMsg.Text = ex.Message;
}
}
}
I see your code is right because I used same way to upload and store image into folder like you.
string path = Server.MapPath("~/Photos/" + f.FileName);
f.SaveAs(path);
May I see your full code ?
Here is my code which reads excelsheet files.but i can see my other functions are working fine but when try to get resource as url it return null.
URL resource = null;
try {
System.out.println(file3);
resource = getServletContext().getResource(file3);
System.out.println("Problem with getting resource"+resource);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
File file = null;
try {
System.out.println(resource.toURI());
file = new File(resource.toURI());
} catch (URISyntaxException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
FileInputStream input = null;
try {
input = new FileInputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Workbook w;
w = Workbook.getWorkbook(input);
// Get the first sheet
Sheet sheet = w.getSheet(0);
return sheet;
I am trying to read the InputStream from IHTTPSession.getInputStream() using the following code but its gives Socket TimeOut Exception every time.
private String readInStream(InputStream in){
StringBuffer outBuffer=new StringBuffer();
BufferedInputStream bis=new BufferedInputStream(in);
try {
while(bis.available()>0){
int ch= bis.read();
outBuffer.append((char)ch);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e("DATA_Length", "outputBuffer :"+outBuffer.toString().length());
return outBuffer.toString();
}
i also tried the following Method but the same exception arises
private String readInStream(InputStream in){
String line="";
StringBuffer outBuffer=new StringBuffer();
BufferedReader rd=new BufferedReader(new InputStreamReader(in));
try {
while((line=rd.readLine()) != null){
outBuffer.append(line);
}
} catch (IOException e) {
Log.e("IOException", "IOException in readInStream:");
e.printStackTrace();
}
Log.e("DATA_Length", "outputBuffer :"+outBuffer.toString().length());
return outBuffer.toString();
}
Getting the content length from the header and reading up to it solved the problem.
Can confirm the accepted answer works (getting content length from the header and reading up to it). Here is some example code to turn the InputStream into a String:
try {
int contentLength = Integer.valueOf(session.getHeaders().get("content-length"));
String msg = new String(in.readNBytes(contentLength)); // the request body
} catch (IOException e) {
e.printStackTrace();
}
If you want to prevent a NullPointerException here, check whether the content-length header actually exists before parsing it to an integer.
To accomplish:
Upload a file from my local to server using an applet and servlet using apache fileupload jar.
Tried:
I have used a simple jsp, with a browse button and posted the action to my servlet (where I used apache fileupload). I was successful in uploading the file to the server.
Issue:
I am trying to upload a file, from my local machine, using an applet. I do not want to manually select files, instead upload files that are present in a specific folder. For now I have hardcoded the folder. I am able to look at the folder and get the list of files I want to upload.
Also, I have successfully established a connection from my applet to servlet.
Issue arises at the upload.parseRequest(request) in the servlet. I'm thinking its because the applet cannot post to servlet's request object.
Also, I have set the request type to multipart/form-data in my applet.
Right now, I am trying to pass the absolute path of the file to servlet and upload.
I have seen other posts where byte stream data is passed from applet to servlet, but the servlet uses the traditional File.write.
For me, it is mandatory to achieve this using apache fileupload.
Please suggest on how to pass a file/file path from applet to servlet, where the upload is handled by apache fileupload.
Below are my FileUploadHandler (where the HTTP requests are handled) and FileUpload(which is my applet)
Below is my FileUpload Handler:
#WebServlet(name = "FileUploadHandler", urlPatterns = { "/upload" })
#MultipartConfig
public class FileUploadHandler extends HttpServlet {
String uploadFolder ="";
#Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("doPost-servlet URL is: "
+ request.getRequestURL());
try {
uploadFolder = fileToUpload(request);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
uploadFolder = getServletContext().getRealPath("")+ File.separator;
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// process only if its multipart content
if (ServletFileUpload.isMultipartContent(request)) {
System.out.println("Yes, it is a multipart request...");
try {
List<FileItem> multiparts = upload.parseRequest(request);
System.out.println("Upload.parseRequest success !");
for (FileItem item : multiparts) {
if (!item.isFormField()) {
String name = new File(item.getName()).getName();
item.write(new File(uploadFolder + File.separator
+ name));
}
}
System.out.println("File uploaded to server !");
// File uploaded successfully
request.setAttribute("message", "File Uploaded Successfully");
} catch (Exception ex) {
request.setAttribute("message", "File Upload Failed due to "
+ ex);
}
} if(!ServletFileUpload.isMultipartContent(request)){
throw new ServletException("Content type is not multipart/form-data");
}
doGet(request, response);
//request.getRequestDispatcher("/result.jsp").forward(request, response);
OutputStream outputStream = response.getOutputStream();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
objectOutputStream.writeObject("Success !");
objectOutputStream.flush();
objectOutputStream.close();
}
private String fileToUpload(HttpServletRequest request) throws IOException,
ClassNotFoundException {
ServletInputStream servletIn = request.getInputStream();
ObjectInputStream in = new ObjectInputStream(servletIn);
String uploadFile = (String) in.readObject();
System.out.println("Value in uploadFolder is: " + uploadFile);
return uploadFile;
}
Below is the fileupload applet:
public class FileUpload extends Applet {
private JButton capture;
private JTextField textField;
private final String pathDirectory = "C:\\";
private final String captureConfirmMessage = "Are you sure you want to continue?";
private final String confirmDialogTitle = "Confirm upload";
final File folder = new File(pathDirectory);
public void init() {
upload= new JButton("Upload");
textField = new JTextField();
capture.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
int selection = JOptionPane.showConfirmDialog(upload,
uploadConfirmMessage, confirmDialogTitle,
JOptionPane.YES_NO_OPTION);
if (selection == JOptionPane.OK_OPTION) {
listFilesForFolder(folder);
} else if (selection == JOptionPane.CANCEL_OPTION) {
JOptionPane.showMessageDialog(upload,
"You have aborted upload", "Upload Cancelled", 2);
}
}
});
add(upload);
add(textField);
}
public void listFilesForFolder(final File folder) {
for (final File fileEntry : folder.listFiles()) {
if (fileEntry.isDirectory()) {
listFilesForFolder(fileEntry);
} else {
try {
onSendData(fileEntry.getAbsolutePath());
System.out.println(fileEntry.getAbsolutePath());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private URLConnection getServletConnection() throws MalformedURLException,
IOException {
// Open the servlet connection
URL urlServlet = new URL("http://localhost:8081/UploadFile/upload");
HttpURLConnection servletConnection = (HttpURLConnection) urlServlet
.openConnection();
// Config
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches(false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setRequestProperty("Content-Type", "multipart/form-data;");
servletConnection.connect();
return servletConnection;
}
private void onSendData(String fileEntry) {
try {
// Send data to the servlet
HttpURLConnection servletConnection = (HttpURLConnection) getServletConnection();
OutputStream outstream = servletConnection.getOutputStream();
ObjectOutputStream objectOutputStream= new ObjectOutputStream(
outstream);
objectOutputStream.writeObject(fileEntry);
// Receive result from servlet
InputStream inputStream = servletconnection.getInputStream();
ObjectInputStream objectInputStream = new ObjectInputStream(
inputStream);
String result = (String) objectInputStream.readObject();
objectInputStream.close();
inputStream.close();
out.flush();
out.close();
// Display result on the applet
textField.setText(result);
} catch (java.net.MalformedURLException mue) {
mue.printStackTrace();
textField.setText("Invalid serlvetUrl, error: " + mue.getMessage());
} catch (java.io.IOException ioe) {
ioe.printStackTrace();
textField.setText("Couldn't open a URLConnection, error: "
+ ioe.getMessage());
} catch (Exception e) {
e.printStackTrace();
textField.setText("Exception caught, error: " + e.getMessage());
}
}
public void paint(Graphics g) {
g.drawString("Click the button above to capture", 5, 50);
}
I could finally succeed posting the request to the servlet from the applet.
It was a simple logic that I was missing. I did not add the header and trailer while posting to the servlet, which was the key, in the servlet to identify the incoming request as a multipart data.
FileInputStream fileInputStream = new FileInputStream(new File(
fileEntry));
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream
.writeBytes("Content-Disposition: form-data; name=\"upload\";"
+ " filename=\"" + fileEntry + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form
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);
System.out.println(fileEntry + " uploaded.");
}
// send multipart form data necesssary after file data
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
I added the header and trailer and also used this to create the URL connection.
private URLConnection getServletConnection() throws MalformedURLException,
IOException {
// Open the servlet connection
URL urlServlet = new URL("http://localhost:8083/UploadFile/upload");
HttpURLConnection servletConnection = (HttpURLConnection) urlServlet
.openConnection();
// Config
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches(false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setRequestMethod("POST");
servletConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + this.boundary);
servletConnection.setRequestProperty("Connection", "Keep-Alive");
servletConnection.connect();
return servletConnection;
}
Then, in the servlet, I was just reading the data using upload.ParseRequest(request).
Thank you for the help.