We Keep Coding

How to create File object from assets folder?

I am trying to read a pdf file from my assets folder but I do not know how to get the path of pdf file.
I right click on pdf file and select "copy Path" and paste it
Here is the another screen shot of my code:
Here is my code:
File file = new File("/Users/zulqarnainmustafa/Desktop/ReadPdfFile/app/src/main/assets/Introduction.pdf");
if (file.exists()){
Uri path = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(path, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
this.startActivity(intent);
}
catch (ActivityNotFoundException e) {
Toast.makeText(this, "No application available to view PDF", Toast.LENGTH_LONG).show();
}
}else{
Toast.makeText(this, "File path not found", Toast.LENGTH_LONG).show();
}
I always get file not found, Help me to create File object or let me know how I can get the exact path for a file I also tried with file:///android_asset/Introduction.pdf but no success. I also tried with Image.png but never gets file.exists() success. I am using Mac version of Android studio. Thanks

get input stream from asset and convert it to a file object.
File f = new File(getCacheDir()+"/Introduction.pdf");
if (!f.exists())
try {
InputStream is = getAssets().open("Introduction.pdf");
byte[] buffer = new byte[1024];
is.read(buffer);
is.close();
FileOutputStream fos = new FileOutputStream(f);
fos.write(buffer);
fos.close();
} catch (Exception e) { throw new RuntimeException(e); }

Short converter (storing asset as cache file) in Kotlin:
fun fileFromAsset(name: String) : File =
File("$cacheDir/$name").apply { writeBytes(assets.open(name).readBytes()) }
cacheDir is just shorthand for this.getCacheDir() and should be predefined for you.

Can you try this code
AssetManager am = getAssets();
InputStream inputStream = am.open("Indroduction.pdf");
File file = createFileFromInputStream(inputStream);
private File createFileFromInputStream(InputStream inputStream) {
try{
File f = new File("new FilePath");
OutputStream outputStream = new FileOutputStream(f);
byte buffer[] = new byte[1024];
int length = 0;
while((length=inputStream.read(buffer)) > 0) {
outputStream.write(buffer,0,length);
}
outputStream.close();
inputStream.close();
return f;
}catch (IOException e) {
//Logging exception
}
return null;
}
Then try with
File file = new File("new file path");
if (file.exists())

Error in uploaing file from android to ftp server

I'm trying to upload an image from android to ftp server, but when i try to open the image that i uploaded i see the following message instead of the image "the image cannot be displayed because it contains errors"
and this is the code that i use
public void uploadImage(String path){
String server = "www.domainname.com";
int port = 21;
String user = "ftp-username";
String pass = "ftp-password";
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(server, port);
ftpClient.login(user, pass);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
// APPROACH #1: uploads first file using an InputStream
File firstLocalFile = new File(path);
long fileSize = firstLocalFile.length();
Log.i("File Size",fileSize+"");
String firstRemoteFile = "testfile1.jpg";
InputStream inputStream = new FileInputStream(firstLocalFile);
Log.i("uploading", "Start uploading first file");
boolean done = ftpClient.storeFile(firstRemoteFile, inputStream);
inputStream.close();
if (done) {
Log.i("uploaded", "finished uploading first file");
}
// APPROACH #2: uploads second file using an OutputStream
File secondLocalFile = new File(path);
String secondRemoteFile = "testfile2.jpg";
inputStream = new FileInputStream(secondLocalFile);
Log.i("uploading", "Start uploading second file");
OutputStream outputStream = ftpClient.storeFileStream(secondRemoteFile);
byte[] bytesIn = new byte[4096];
int read = 0;
while ((read = inputStream.read(bytesIn)) != -1) {
outputStream.write(bytesIn, 0, read);
}
inputStream.close();
outputStream.close();
boolean completed = ftpClient.completePendingCommand();
if (completed) {
Log.i("uploaded", "finished uploading second file");
}
} catch (IOException ex) {
Log.i("Error", "Error: " + ex.getMessage());
ex.printStackTrace();
} finally {
try {
if (ftpClient.isConnected()) {
ftpClient.logout();
ftpClient.disconnect();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
where is the error!!?
Thanks in advance..

This looks suspiciously like this bug: FTPClient corrupts the images while uploading to ftp server on android?
Try using FTP4J instead.

Checking if file exists, if so, dont create new file and append instead

private void saveFormActionPerformed(java.awt.event.ActionEvent evt) {
name = nameFormText.getText();
surname = surnameFormText.getText();
age = Integer.parseInt(ageFormText.getText());
stadium = stadiumFormText.getText();
Venues fix = new Venues();
fix.setName(name);
fix.setSurname(surname);
fix.setAge(age);
fix.setStadium(stadium);
File outFile;
FileOutputStream fStream;
ObjectOutputStream oStream;
try {
outFile = new File("output.data");
fStream = new FileOutputStream(outFile);
oStream = new ObjectOutputStream(fStream);
oStream.writeObject(fix);
JOptionPane.showMessageDialog(null, "File written successfully");
oStream.close();
} catch (IOException e) {
System.out.println(e);
}
}
This is what I have so far. Any ideas on what I could do with it to append the file if it's already created?

You have first to check if the file exists before, if not create a new one. To learn how to append object to objectstream take a look at this question.
File outFile = new File("output.data");
FileOutputStream fStream;
ObjectOutputStream oStream;
try {
if(!outFile.exists()) outFile.createNewFile();
fStream = new FileOutputStream(outFile);
oStream = new ObjectOutputStream(fStream);
oStream.writeObject(fix);
JOptionPane.showMessageDialog(null, "File written successfully");
oStream.close();
} catch (IOException e) {
System.out.println(e);
}

Using Java 7, it is simple:
final Path path = Paths.get("output.data");
try (
final OutputStream out = Files.newOutputStream(path, StandardOpenOption.CREATE,
StandardOpenOption.APPEND);
final ObjectOutputStream objOut = new ObjectOutputStream(out);
) {
// work here
} catch (IOException e) {
// handle exception here
}
Drop File!

Trouble with uploading a file from an applet to servlet

I am working on an applet that records voice and uploads to a servlet.
Here is the code of the upload thread in the applet
class uploadThread extends Thread {
#Override
public void run() {
try {
//Preparing the file to send
AudioFileFormat.Type fileType = AudioFileFormat.Type.WAVE;
File file = File.createTempFile("uploded", ".wav");
byte audio[] = out.toByteArray();
InputStream input = new ByteArrayInputStream(audio);
final AudioFormat format = getFormat();
final AudioInputStream ais = new AudioInputStream(input, format, audio.length / format.getFrameSize());
AudioSystem.write(ais, fileType, file);
//uploading to servlet
FileInputStream in = new FileInputStream(fileToSend);
byte[] buf = new byte[1024];
int bytesread = 0;
String toservlet = "http://localhost:8080/Servlet/upload";
URL servleturl = new URL(toservlet);
URLConnection servletconnection = servleturl.openConnection();
servletconnection.setDoInput(true);
servletconnection.setDoOutput(true);
servletconnection.setUseCaches(false);
servletconnection.setDefaultUseCaches(false);
DataOutputStream out = new DataOutputStream(servletconnection.getOutputStream());
while ((bytesread = in.read(buf)) > -1) {
out.write(buf, 0, bytesread);
}
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.err.println("Error during upload");
}
}
}//End of inner class uploadThread
Here is the code of the grab file method in the servlet:
java.io.DataInputStream dis = null;
try {
int fileLength = Integer.valueOf(request.getParameter("fileLength"));
String fileName = request.getParameter("fileName");
dis = new java.io.DataInputStream(request.getInputStream());
byte[] buffer = new byte[fileLength];
dis.readFully(buffer);
dis.close();
File cibleServeur = new File("/Users/nebrass/Desktop/" + fileName);
FileOutputStream fos = new FileOutputStream(cibleServeur);
fos.write(buffer);
fos.close();
} catch (IOException ex) {
Logger.getLogger(UploadServlet.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
dis.close();
} catch (Exception ex) {
Logger.getLogger(UploadServlet.class.getName()).log(Level.SEVERE, null, ex);
}
}
I have created a certificate with the keytool. And i have signed the JAR of the applet.
I have added the applet to the jsp file and it is working, and have the all permissions (I tried to save a file on a desktop using the applet)
Update: The problem is that the file is not sent, and when i try to debug the servlet, it is not invoked by the the applet.
Please help

That's not how it works. You've just opened a URLConnection and wrote to the output stream. That way you're assuming something like a socket connection, but here we need more of a HttpUrlConnection and then a request-parameter and a multi-part request.
Google Search
Google found lots of solutions, but for the completeness of the answer, I'm adding one below :
https://stackoverflow.com/a/11826317/566092

You want up upload a file from the server to the user desktop?
I doubt this will be allowed, for obvious security reasons.
Why don't you just call the servlet directly from the browser? And "save as" the file?
Here is an exemple on how to send a file (any type) from a servlet.
protected void doPost(
...
response.setContentType("your type "); // example: image/jpeg, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/octet-stream
response.setHeader("Content-Disposition","attachment; filename=\"your_filename\"");
File uploadedFile = new File("/your_file_folde/your_file_name");
if (uploadedFile.exists()){
FileUtils.copyFile(uploadedFile, response.getOutputStream());
}
else { // Error message
}
....
}

Android file not found exception when trying to upload file via FTP

I'm trying to upload a text file to a server via FTP. The text file is in data/data/my package/files (I have checked in the DDMS). I am getting a filenotfoundexception in LogCat.
Here's my code:
FTPClient client = new FTPClient();
FileInputStream fis = null;
try {
client.connect("82.163.99.80");
client.enterLocalPassiveMode();
client.login("user", "password");
//
// Create an InputStream of the file to be uploaded
//
String filename = "sdcardstats.txt";
fis = new FileInputStream(filename);
//
// Store file to server
//
client.storeFile(filename, fis);
client.logout();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fis != null) {
fis.close();
}
client.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
Can anyone help please?

Your code:
fis = new FileInputStream(filename);
... requires a path, not a file name.
Try instead:
fis = openFileInput(filename);
... which takes a file name and tries to open it in your application's private file storage area. For more information, see the Android Developers Guide for Data Storage: Internal Files, and FileInputStream and openFileInput.