Copying Files from One Directory to Another in Java

How to copy file from one location to another location?

You can use this (or any variant):

Files.copy(src, dst, StandardCopyOption.REPLACE_EXISTING);

Also, I'd recommend using File.separator or / instead of \\ to make it compliant across multiple OS, question/answer on this available here.

Since you're not sure how to temporarily store files, take a look at ArrayList:

List<File> files = new ArrayList();
files.add(foundFile);

To move a List of files into a single directory:

List<File> files = ...;
String path = "C:/destination/";
for(File file : files) {
    Files.copy(file.toPath(),
        (new File(path + file.getName())).toPath(),
        StandardCopyOption.REPLACE_EXISTING);
}

Copy file from one folder to another in Java

You can use standard java.nio.file.Files.copy(Path source, Path target, CopyOption... options)

How to copy file from directory to another Directory in Java

Use Apache Commons FileUtils
FileUtils.copyDirectory(source, desc);

How to copy file into another directory in Java 8?

Files.copy needs the name of the target file.

Path targetFilePath = Paths.get("D:/folder/Movie.class");

This is indeed requires a bit more than the conventional "if the target is a directory, copy the file into it." On the otherhand a quite useful requirement: an InputStream no longer has a name.

How to copy files from one folder to another using Java?

You can use the Java.io.File class.
It has a method that checks if a fill exists.

Example:

//create files
File original =new File("C:\\test\\testfile.txt");
File destination =new File("D:\\test\\file.txt");
//check if file exists.
for(int x=0;destination.exists()==true;x++){
//if file exists then add 1 to file name and check if exists again.
destination=new File("D\\test\\file"+x+".txt");

}
//copy file.
Files.copy(origional, destination, StandardCopyOption.REPLACE_EXISTING);

Copy entire directory contents to another directory?

FileUtils.copyDirectory()

Copies a whole directory
to a new location preserving the file
dates. This method copies the
specified directory and all its child
directories and files to the specified
destination. The destination is the
new location and name of the
directory.

The destination directory is created
if it does not exist. If the
destination directory did exist, then
this method merges the source with the
destination, with the source taking
precedence.

To do so, here's the example code

String source = "C:/your/source";
File srcDir = new File(source);

String destination = "C:/your/destination";
File destDir = new File(destination);

try {
    FileUtils.copyDirectory(srcDir, destDir);
} catch (IOException e) {
    e.printStackTrace();
}

Need to copy all files from one folder to another using java

Apache commons-io library has a FileUtils.copyDirectory() method. It copies all files from source dir and its subfolders to dest dir, creating dest dir if necessary.

FileUtils docs

If you are using Gradle, add this to your dependencies section to add this library to your project:

implementation 'commons-io:commons-io:2.11.0'

Copy files from one directory to another and append new files with timestamp instead of overwriting in Java

    //construct the src and dest file structure
    File srcFile = new File(src, file);
    File destFile = new File(dest, file);
    while (destFile.exists()) {
        destFile = new File(dest, file + '-' + Instant.now());
    }

In one case the destination file got named test-file.txt-2018-03-14T11:05:21.103706Z. The time given is in UTC. In any case you will end up with a name of file that doesn’t already exist (if the loop terminates, but I have a hard time seeing the scenario where it doesn’t).

You may want to append the timestamp only to plain files and reuse existing folders (directories), I don’t know your requirements here. And you may want to append the timestamp before the extension if there is one (to get test-file-2018-03-14T11:05:21.103706Z.txt instead). I trust you to make the necessary modifications.

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