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Pushing multiple files to smb share jcifs from local folder

How we can push multiple files from our local folder to smb share folder using java. I can do with my single file using smbFile and it is working. I am looking for pushing multiple file push to smb share.
Any reference links and sample code would be helpful.
Thanks.
EDIT, Reference of code :
SmbFile[] files = getSMBListOfFiles(sb, logger, domain, userName, password, sourcePath, sourcePattern);
if (files == null)
return false;
output(sb, logger, " Source file count: " + files.length);
String destFilename;
FileOutputStream fileOutputStream;
InputStream fileInputStream;
byte[] buf;
int len;
for (SmbFile smbFile: files) {
destFilename = destinationPath + smbFile.getName();
output(sb, logger, " copying " + smbFile.getName());
try {
fileOutputStream = new FileOutputStream(destFilename);
fileInputStream = smbFile.getInputStream();
buf = new byte[16 * 1024 * 1024];
while ((len = fileInputStream.read(buf)) > 0) {
fileOutputStream.write(buf, 0, len);
}
fileInputStream.close();
fileOutputStream.close();
} catch (SmbException e) {
OutputHandler.output(sb, logger, "Exception during copyNetworkFilesToLocal stream to output, SMP issue: " + e.getMessage(), e);
e.printStackTrace();
return false;
}
This works fine if i try to send one single file of anyformat. But if would like to send multiple file to smb share fromocal folder. For This i need thr help please. Thanks.

Try to declare a SmbFile object that is a root folder of your folder, that you want to upload to the shared folder. Then iterate through the root.listFiles() array.
Put the uploadable files in that folder.
I assume that, your SmbFile[] files array only contains one file if it's only uploading one file.
Or another possible solution is that, try to use SmbFileOutputStream and SmbFileInputStream instead of FileOutputStream and FileInputStream.

I'm guessing you are using jcifs-library (which is quite outdated), so firstly I would recommend you to switch library. I switched to SMBJ and here is how I'm uploading file:
private static void upload(File source, DiskShare diskShare, String destPath, boolean overwrite) throws IOException {
try (InputStream is = new java.io.FileInputStream(source)) {
if (destPath != null && is != null) {
// https://learn.microsoft.com/en-us/windows/win32/fileio/creating-and-opening-files
Set<AccessMask> accessMask = new HashSet<>(EnumSet.of(
AccessMask.FILE_READ_DATA,
AccessMask.FILE_WRITE_DATA, AccessMask.DELETE));
Set<SMB2ShareAccess> shareAccesses = new HashSet<>(
EnumSet.of(SMB2ShareAccess.FILE_SHARE_WRITE));
Set<FileAttributes> createOptions = new HashSet<>(
EnumSet.of(FileAttributes.FILE_ATTRIBUTE_NORMAL));
try (com.hierynomus.smbj.share.File file = diskShare
.openFile(destPath, accessMask, createOptions,
shareAccesses,
(overwrite
? SMB2CreateDisposition.FILE_OVERWRITE_IF
: SMB2CreateDisposition.FILE_CREATE),
EnumSet.noneOf(SMB2CreateOptions.class))) {
int bufferSize = 2048;
if (source.length() > 20971520l) {
bufferSize = 131072;
}
byte[] buffer = new byte[bufferSize];
long fileOffset = 0;
int length = 0;
while ((length = is.read(buffer)) > 0) {
fileOffset = diskShare.getFileInformation(destPath)
.getStandardInformation().getEndOfFile();
file.write(buffer, fileOffset, 0, length);
}
file.flush();
file.close();
} finally {
is.close();
}
}
}
}
Of course takes a little effort on connecting the SMB-server and authenticating before this, but that's another case...

How to duplicate a file given a different name in the same directory in windows

I have been trying to duplicate a file but change the name of it in the same windows directory but I got not luck.
I cant just copy the file in the same directory because of the windows rule that two files cannot have the same name in the same directory.
I am not allowed to copy it to another directory then rename it, and then move it back in the same directory.
And I don't see any helpful implementation in the File.class.
Tried something like that but it didnt work:
File file = new File(filePath);
File copiedFile = new File(filePath);
//then rename the copiedFile and then try to copy it
Files.copy(file, copiedFile);

An initial attempt would be using Path as suitable:
Path file = Paths.get(filePath);
String name = file.getFileName().toString();
String copiedName = name.replaceFirst("(\\.[^\\.]*)?$", "-copy$0");
Path copiedFile = file.resolveSibling(copiedName);
try {
Files.copy(file, copiedFile);
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}

You could create a new file in the same directory and then just copy the contents of the original file to the duplicate
See: Java read from one file and write into another file using methods
For more info
you can also use this snippet from https://www.journaldev.com/861/java-copy-file
private static void copyFileUsingStream(File source, File dest) throws IOException {
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(source);
os = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
} finally {
is.close();
os.close();
}
}

#Pierre his code is perfect, however this is what I use so I won't be able to change the extension:
public static void copyWithDifferentName(File sourceFile, String newFileName) {
if (sourceFile == null || newFileName == null || newFileName.isEmpty()) {
return;
}
String extension = "";
if (sourceFile.getName().split("\\.").length > 1) {
extension = sourceFile.getName().split("\\.")[sourceFile.getName().split("\\.").length - 1];
}
String path = sourceFile.getAbsolutePath();
String newPath = path.substring(0, path.length() - sourceFile.getName().length()) + newFileName;
if (!extension.isEmpty()) {
newPath += "." + extension;
}
try (OutputStream out = new FileOutputStream(newPath)) {
Files.copy(sourceFile.toPath(), out);
} catch (IOException e) {
e.printStackTrace();
}
}

What is the best way to calculate a checksum for a Java class?

I have an application where I am generating a "target file" based on a Java "source" class. I want to regenerate the target when the source changes. I have decided the best way to do this would be to get a byte[] of the class contents and calculate a checksum on the byte[].
I am looking for the best way to get the byte[] for a class. This byte[] would be equivalent to the contents of the compiled .class file. Using ObjectOutputStream does not work. The code below generates a byte[] that is much smaller than the byte contents of the class file.
// Incorrect function to calculate the byte[] contents of a Java class
public static final byte[] getClassContents(Class<?> myClass) throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try( ObjectOutputStream stream = new ObjectOutputStream(buffer) ) {
stream.writeObject(myClass);
}
// This byte array is much smaller than the contents of the *.class file!!!
byte[] contents = buffer.toByteArray();
return contents;
}
Is there a way to get the byte[] with the identical contents of the *.class file? Calculating the checksum is the easy part, the hard part is obtaining the byte[] contents used to calculate an MD5 or CRC32 checksum.

THis is the solution that I ended up using. I don't know if it's the most efficient implementation, but the following code uses the class loader to get the location of the *.class file and reads its contents. For simplicity, I skipped buffering of the read.
// Function to obtain the byte[] contents of a Java class
public static final byte[] getClassContents(Class<?> myClass) throws IOException {
String path = myClass.getName().replace('.', '/');
String fileName = new StringBuffer(path).append(".class").toString();
URL url = myClass.getClassLoader().getResource(fileName);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try (InputStream stream = url.openConnection().getInputStream()) {
int datum = stream.read();
while( datum != -1) {
buffer.write(datum);
datum = stream.read();
}
}
return buffer.toByteArray();
}

I don't get what you means, but i think you are looking for this, MD5.
To check MD5 of a file, you can use this code
public String getMd5(File file)
{
DigestInputStream stream = null;
try
{
stream = new DigestInputStream(new FileInputStream(file), MessageDigest.getInstance("MD5"));
byte[] buffer = new byte[65536];
read = stream.read(buffer);
while (read >= 1) {
read = stream.read(buffer);
}
}
catch (Exception ignored)
{
int read;
return null;
}
return String.format("%1$032x", new Object[] { new BigInteger(1, stream.getMessageDigest().digest()) });
}
Then, you can store the md5 of a file in any way for exmaple XML. An exmaple of MD5 is 49e6d7e2967d1a471341335c49f46c6c so once the file name and size change, md5 will change. You can store md5 of each file in XML format and next time your run a code to check md5 and compare the md5 of each file in the xml file.

If you really want the contents of the .class file, you should read the contents of .class file, not the byte[] representation that is in memory. So something like
import java.io.*;
public class ReadSelf {
public static void main(String args[]) throws Exception {
Class classInstance = ReadSelf.class;
byte[] bytes = readClass(classInstance);
}
public static byte[] readClass(Class classInstance) throws Exception {
String name = classInstance.getName();
name = name.replaceAll("[.]", "/") + ".class";
System.out.println("Reading this: " + name);
File file = new File(name);
System.out.println("exists: " + file.exists());
return read(file);
}
public static byte[] read(File file) throws Exception {
byte[] data = new byte[(int)file.length()]; // can only read a file of size INT_MAX
DataInputStream inputStream =
new DataInputStream(
new BufferedInputStream(
new FileInputStream(file)));
int total = 0;
int nRead = 0;
try {
while((nRead = inputStream.read(data)) != -1) {
total += nRead;
}
}
finally {
inputStream.close();
}
System.out.println("Read " + total
+ " characters, which should match file length of "
+ file.length() + " characters");
return data;
}
}

Decompressing tar file with Apache Commons Compress

I'm using Apache Commons Compress to create tar archives and decompress them. My problems start with this method:
private void decompressFile(File file) throws IOException {
logger.info("Decompressing " + file.getName());
BufferedOutputStream outputStream = null;
TarArchiveInputStream tarInputStream = null;
try {
tarInputStream = new TarArchiveInputStream(
new FileInputStream(file));
TarArchiveEntry entry;
while ((entry = tarInputStream.getNextTarEntry()) != null) {
if (!entry.isDirectory()) {
File compressedFile = entry.getFile();
File tempFile = File.createTempFile(
compressedFile.getName(), "");
byte[] buffer = new byte[BUFFER_MAX_SIZE];
outputStream = new BufferedOutputStream(
new FileOutputStream(tempFile), BUFFER_MAX_SIZE);
int count = 0;
while ((count = tarInputStream.read(buffer, 0, BUFFER_MAX_SIZE)) != -1) {
outputStream.write(buffer, 0, count);
}
}
deleteFile(file);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
}
}
Every time I run the code, compressedFile variable is null, but the while loop is iterating over all entries in my test tar.
Could you help me to understand what I'm doing wrong?

From the official documentation
Reading entries from an tar archive:
TarArchiveEntry entry = tarInput.getNextTarEntry();
byte[] content = new byte[entry.getSize()];
LOOP UNTIL entry.getSize() HAS BEEN READ {
tarInput.read(content, offset, content.length - offset);
}
I have written an example starting from your implementation and testing with a very trivial .tar (just one entry of text).
Not knowing the exact requirement I just take care of solving the problem of reading the archive avoiding the nullpointer. Debugging, the entry is available as you also have found
private static void decompressFile(File file) throws IOException {
BufferedOutputStream outputStream = null;
TarArchiveInputStream tarInputStream = null;
try {
tarInputStream = new TarArchiveInputStream(
new FileInputStream(file));
TarArchiveEntry entry;
while ((entry = tarInputStream.getNextTarEntry()) != null) {
if (!entry.isDirectory()) {
File compressedFile = entry.getFile();
String name = entry.getName();
int size = 0;
int c;
while (size < entry.getSize()) {
c = tarInputStream.read();
System.out.print((char) c);
size++;
}
(.......)
AS I said: I tested with a tar including only an entry of text (you can also try this approach to verify the code) to be sure that the null is avoided.
You need to make all the needed adaptations for your real needs.
It is clear that you will have to handle streams as in the metacode I posted on top.
It shows how to deal with the single entries.

Try using getNextEntry() method instead of getNextTarEntry() method.
The second method returns a TarArchiveEntry. Probably this is not what you want!

How to computer CRC32/MD5 of a specific file withing my APK

I want to calculate the CRC or MD5 of a specific file (Activity) in my Application (within my APK) so that I can compare that value in another file and make sure that the first file has not been tampered with.
Can I do that? Is so, can you guide me with it?
Example:
Let say I have file A.java and B.java. I want to calculate A.java CRC32/MD5 and store this value in B.java so that when B.java executes it recalaculates A.java and compares it to the known value

You can't do this. There are no separate class files on Android, you get a single DEX file with all classes and libraries compiled in. You have to compute the hash of the classes.dex file and store it in a resource file, because putting it in a class file will change the overall hash value. However, if I decompile your app and changes your classes.dex, I can also changes the resources, so that doesn't really offer any real protection. Of course, you can try to obfuscate or hide the value to make it harder, but some tools will look for CRC/MessageDigest references and simply hook them to return the same value every time.

Get the contents of A.java into a string using a java.io.BufferedReader and proceed as follows:
public byte[] getMD5(String fileAContents) throws NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
messageDigest.update(fileAContents.getBytes());
return messageDigest.digest();
}

public static void calculate(Context context) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
ZipInputStream fis = get(context);
System.out.println("fis: " + fis);
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = fis.read(dataBytes)) != -1) {
md.update(dataBytes, 0, nread);
};
byte[] mdbytes = md.digest();
//convert the byte to hex format method 1
StringBuffer sb = new StringBuffer();
for (int i = 0; i < mdbytes.length; i++) {
sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
}
System.out.println("Digest(in hex format):: " + sb.toString());
//convert the byte to hex format method 2
StringBuffer hexString = new StringBuffer();
for (int i=0;i<mdbytes.length;i++) {
String hex=Integer.toHexString(0xff & mdbytes[i]);
if(hex.length()==1) hexString.append('0');
hexString.append(hex);
}
System.out.println("Digest(in hex format):: " + hexString.toString());
if(fis!=null){
fis.close();
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static ZipInputStream get(Context context){
// Get the path to the apk container.
String apkPath = context.getApplicationInfo().sourceDir;
JarFile containerJar = null;
try {
// Open the apk container as a jar..
containerJar = new JarFile(apkPath);
// Look for the "classes.dex" entry inside the container.
ZipEntry zzz = containerJar.getEntry("classes.dex");
// If this entry is present in the jar container
if (zzz != null) {
System.out.println("long " + zzz.getCrc());
// Get an Input Stream for the "classes.dex" entry
InputStream in = containerJar.getInputStream(zzz);
ZipInputStream zin = new ZipInputStream(in);
return zin;
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (containerJar != null)
try {
containerJar.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}