I'm using HttpURLConnection to get a PDF file from the server then saving that PDF to the user's phone. Getting the file is working perfectly, but when saving, some files contain corrupted characters.
InputStream in = null;
OutputStream fileOutput = null;
try {
File file = new File(path);
file.mkdirs();
file = new File(path + File.separator + fileName + "." + fileExentsion);
file.createNewFile();
fileOutput = new FileOutputStream(file);
final byte[] buffer = new byte[1024];
int read;
in = conn.getInputStream();
while ((read = in.read(buffer)) != -1) {
fileOutput.write(buffer, 0, read);
}
fileOutput.flush();
return Uri.fromFile(file).toString(); // To open an intent in onPostExecute()
}
I tried using BufferedReader and BufferedWriter but the OS couldn't open the file after being saved. It is really weird because the same strings appears in other files correctly. And when downloading the file from a desktop, it looks good too.
Related
I have a zip file in assets. On first run of app, zip file (all files and folders) gets unzipped and stored in internal storage area. The base unzipped path is getFilesDir(). Since zip also contains folders, i could not use openFileOutput as it gave an error, contains a path separator. So i have used FileOutputStream instead which is now working fine. Since FileOutputStream does not expect private flag. Are these unzipped files and folders are private to my app or can they be accessed from other apps?
Here's the code,
`public boolean unpackZip(InputStream is, String path) throws IOException {
String filename;
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
ZipEntry ze;
byte[] buffer = new byte[1024];
int count;
while ((ze = zis.getNextEntry()) != null) {
filename = ze.getName();
// Need to create directories if not exists, or
// it will generate an Exception...
if (ze.isDirectory()) {
File fmd = new File(path + filename);
fmd.mkdirs();
continue;
}
FileOutputStream fout = new FileOutputStream(path + filename);
while ((count = zis.read(buffer)) != -1) {
fout.write(buffer, 0, count);
}
fout.close();
zis.closeEntry();
}
zis.close();
return true;
}`
if(!ErmUtil.isNull(listOfActualFilePaths) && listOfActualFilePaths.size()>0){
FileOutputStream fos = new FileOutputStream("/smiles/wrk/attachments/ermWeb/taxation/testing.zip");
ZipOutputStream zos = new ZipOutputStream(fos);
Iterator itrOnFNames = listOfActualFilePaths.iterator();
while (itrOnFNames.hasNext()) {
StringBuffer ActualPath = (StringBuffer) itrOnFNames.next();
addToZipFile(ActualPath.toString(), zos);
}
zos.close();//Closing Both Streams
fos.close();
}
public void addToZipFile(String fileName, ZipOutputStream zos) throws FileNotFoundException, IOException {
System.out.println("Writing '" + fileName + "' to zip file");
File file = new File(fileName);
int index = fileName.lastIndexOf("/");
String fileNameForZip = fileName.substring(index+1);
FileInputStream fis = new FileInputStream(file);
ZipEntry zipEntry = new ZipEntry(fileNameForZip);
zos.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
zos.write(bytes, 0, length);
}
zos.closeEntry();
fis.close();
}
I am using above code, to save zip-ed file on a specific location. But what i want to do is that, instead of saving that file, it get downloaded directly.
Edit 1
See If I want to download a zip file,then according to above code, on path /smiles/wrk/attachments/ermWeb/taxation/testing.zip it will be saved first,then from that folder, I(server) can send it to client(Computer).
But I don't want to save it on the specified path,Instead of "saving first to folder and then sending to client", I directly want to send it to client.
i have a created 3 xml files and compressed into a zip folder . The folder is send from server. When i download the zip folder through browser, its working properly and can extract the files. But when i download it from android application and store in SD card, it is corrupted. I pulled the file from SD card to computer and tried to extract the folder, it shows Zip Folder is invalid . My code is given below :
DefaultHttpClient httpclient1 = new DefaultHttpClient();
HttpPost httpPostRequest = new HttpPost(
Configuration.URL_FEED_UPDATE);
byte[] responseByte = httpclient1.execute(httpPostRequest,
new BasicResponseHandler()).getBytes();
InputStream is = new ByteArrayInputStream(responseByte);
// ---------------------------------------------------
File file1 = new File(Environment
.getExternalStorageDirectory() + "/ast");
file1.mkdirs();
//
File outputFile = new File(file1, "ast.zip");
FileOutputStream fos = new FileOutputStream(outputFile);
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
When I used
ZipInputStream zin = new ZipInputStream(new BufferedInputStream(is));
The ZipInputStream can't store values from stream.
I'd guess that your main mistake is where you get the input stream. What you are actually doing is to get the server response as String (BasicResponseHandler) and then converting that to bytes again. Since Java is all UTF-8 this most likely does not work.
Better try something like
HttpResponse response = httpclient1.execute(httpPostRequest);
InputStream is = response.getEntity().getContent()
(And do better null pointer checking, read the content in a try-catch block and make sure you close all resources in a finally block.)
I've developed an application in which user can download .mp3 files from server. And pre-defined a path to mnt/sdcard/foldername for saving such files. I had run my program in HTC, LG, Samsung works perfect but when I running a same program at samsung galaxy s2 getting an issue that can't able to write(store) in mnt/sdcard/foldername and tried
Environment.getExternalStorageDirectory().getAbsolutePath()
but its shows downloaded file names in given path and zero bytes for each files properties. Any idea to solve this issue?
The SG2 does usually not have a sd-card and uses the internal flash memory as "external" storage. I have solved this issue with this code:
private File initCacheDir() {
String sdState = android.os.Environment.getExternalStorageState();
File imageCacheDir;
if (sdState.equals(android.os.Environment.MEDIA_MOUNTED)) {
File sdDir = android.os.Environment.getExternalStorageDirectory();
imageCacheDir = new File(sdDir, "Android/data/" + App.PACKAGE_NAME + "/files/imageCache");
}
else
imageCacheDir = context.getCacheDir();
if(!imageCacheDir.exists())
imageCacheDir.mkdirs();
return imageCacheDir;
}
Note that this code give you the location of the cache directory, which is usually located in the Android/data folder on the sd-card.
You'll find more details how to solve this issue with SG2 here:
How could i get the correct external storage on Samsung and all other devices?
try this
if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
cacheDir=new File(android.os.Environment.getExternalStorageDirectory(),"yourfile");
else
cacheDir=context.getCacheDir();
if(!cacheDir.exists())
cacheDir.mkdirs();
I finally found the code
public void download(String urlToDownload){
URLConnection urlConnection = null;
try{
URL url = new URL(urlToDownload);
//Opening connection of currrent url
urlConnection = url.openConnection();
urlConnection.connect();
//int lenghtOfFile = urlConnection.getContentLength();
String PATH = Environment.getExternalStorageDirectory() + "/1/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "file.mp3");
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = url.openStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
System.out.println("downloaded"+urlToDownload);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
Source: link
I tried creating a pdf file out of another one(in my local drive) using java.io. The thing is a file with a .pdf extension got created but im unable to open the file, it says the file is already in use and most importantly the size of the file is too large and it keeps on increasing (origin file size : 5,777kB and the newly created one file size as of now is 38,567kB). Im not that much of skilled java programmer but still i would appreciate if anyone can give me an explanation ..
String path = "D:\\priya_Docs\\Android pdfs\\Professional_Android_Application_Development.pdf";
File file = new File(path);
System.out.println("Located a file " + file.isFile());
String filesArray = file.getPath();
File getFile = file.getAbsoluteFile();
FileInputStream fis = new FileInputStream(getFile);
FileOutputStream fos = new FileOutputStream(
"D:\\priya_Docs\\Androiddoc.pdf");
for (int b = fis.read(); b != -1;) {
fos.write(b);
}
Simple use,
FileUtils.copyFile()
you meet the two problems
first,you have to close the resource: fis and fos,or it will say the file already in use
second,you have to use the byte[] to receive the data because pdf file is organized in byte arrays
String path = "D:\\priya_Docs\\Android pdfs\\Professional_Android_Application_Development.pdf";
File file = new File(path);
System.out.println("Located a file " + file.isFile());
String filesArray = file.getPath();
File getFile = file.getAbsoluteFile();
FileInputStream fis = new FileInputStream(getFile);
FileOutputStream fos = new FileOutputStream(
"D:\\priya_Docs\\Androiddoc.pdf");
byte[] buff=new byte[1024];
int len;
while((len=fis.read(buff))>=0) {
fos.write(buff,0,len);
}
fis.close();
fos.close();