Four ways of copying files IO

1. Copy FileStreams

This is the most classic way to copy the contents of one file to another file. Using the read file A byte FileInputStream, FileOutputStream written to a file using B. This is the code for the first method:

 1 private static void copyFileUsingFileStreams(File source, File dest)
 2         throws IOException {    
 3     InputStream input = null;    
 4     OutputStream output = null;    
 5     try {
 6            input = new FileInputStream(source);
 7            output = new FileOutputStream(dest);        
 8            byte[] buf = new byte[1024];        
 9            int bytesRead;        
10            while ((bytesRead = input.read(buf)) > 0) {
11                output.write(buf, 0, bytesRead);
12            }
13     } finally {
14         input.close();
15         output.close();
16     }
17 

2. Copy FileChannel

 1 private static void copyFileUsingFileChannels(File source, File dest) throws IOException {    
 2         FileChannel inputChannel = null;    
 3         FileChannel outputChannel = null;    
 4     try {
 5         inputChannel = new FileInputStream(source).getChannel();
 6         outputChannel = new FileOutputStream(dest).getChannel();
 7         outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
 8     } finally {
 9         inputChannel.close();
10         outputChannel.close();
11     }
12 }

 

3. Using Commons IO Copy

 private static void copyFileUsingApacheCommonsIO(File source, File dest)
         throws IOException {
     FileUtils.copyFile(source, dest);
 }

 

4. Class Files Replication of Java7

private static void copyFileUsingJava7Files(File source, File dest)
        throws IOException {    
        Files.copy(source.toPath(), dest.toPath());
}