Copy and rename file on different location

Question

I have one file example.tar.gz and I need to copy it to another location with different name example _test.tar.gz. I have tried with

private void copyFile(File srcFile, File destFile) throws IOException {

    InputStream oInStream = new FileInputStream(srcFile);
    OutputStream oOutStream = new FileOutputStream(destFile);

    // Transfer bytes from in to out
    byte[] oBytes = new byte[1024];
    int nLength;

    BufferedInputStream oBuffInputStream = new BufferedInputStream(oInStream);
    while((nLength = oBuffInputStream.read(oBytes)) > 0) {
        oOutStream.write(oBytes, 0, nLength);
    }
    oInStream.close();
    oOutStream.close();
}

where

String from_path = new File("example.tar.gz");
File source = new File(from_path);

File destination = new File("/temp/example_test.tar.gz");
if(!destination.exists())
    destination.createNewFile();

and then

copyFile(source, destination);

It doesn't work. The path is correct. It prints that the file exists. Can anybody help me?

Correct this code in your post: `String from_path=new File("example.tar.gz");` — Prince John Wesley, Mar 22 '11 at 07:52
you don't need createNewFile w/ FileOutputStream, also you should not use BufferedInputStream(), it doesn't really help. Just use larger than 1k `byte[] oBytes`. Last but not least, `FileChannel.transferTo` is the best way to copyStuff — bestsss, Mar 22 '11 at 07:58

score 42 · Accepted Answer · edited Sep 14 '16 at 11:49

42

Why to reinvent the wheel, just use FileUtils.copyFile(File srcFile, File destFile) , this will handle many scenarios for you

edited Sep 14 '16 at 11:49

Matt

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answered Mar 22 '11 at 07:44

jmj

237,923
42
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438

1

works like a dream – Cleaton Pais Dec 07 '21 at 11:16

score 8 · Answer 2 · edited May 23 '17 at 12:09

I would suggest Apache commons FileUtils or NIO (direct OS calls)

or Just this

Credits to Josh - standard-concise-way-to-copy-a-file-in-java

File source=new File("example.tar.gz");
File destination=new File("/temp/example_test.tar.gz");

copyFile(source,destination);

Updates:

Changed to transferTo from @bestss

 public static void copyFile(File sourceFile, File destFile) throws IOException {
     if(!destFile.exists()) {
      destFile.createNewFile();
     }

     FileChannel source = null;
     FileChannel destination = null;
     try {
      source = new RandomAccessFile(sourceFile,"rw").getChannel();
      destination = new RandomAccessFile(destFile,"rw").getChannel();

      long position = 0;
      long count    = source.size();

      source.transferTo(position, count, destination);
     }
     finally {
      if(source != null) {
       source.close();
      }
      if(destination != null) {
       destination.close();
      }
    }
 }

Using FileStreams might be inefficient to copy files, look at `java.nio.channels.FileChannel.transferTo` — bestsss, Mar 22 '11 at 07:59

score 2 · Answer 3 · answered Jun 13 '19 at 20:20

2

There is Files class in package java.nio.file. You can use the copy method.

Example: Files.copy(sourcePath, targetPath).

Create a targetPath object (which is an instance of Path) with the new name of your file.

answered Jun 13 '19 at 20:20

The_Cute_Hedgehog

1,280
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22

Copy and rename file on different location

3 Answers3

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