How to copy a folder and all its subfolders and files into another folder [duplicate]

This question already has answers here: 开发者_如何转开发 Copying files from one directory to another in Java (34 answers) Closed 7 years ago.

How can I copy a folder and all its subfolders and files into another folder?

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Choose what you like:

• FileUtils from Apache Commons IO (the easiest and safest way)

Example with FileUtils:

File srcDir = new File("C:/Demo/source");
File destDir = new File("C:/Demo/target");
FileUtils.copyDirectory(srcDir, destDir);

• Manually, example before Java 7 (CHANGE: close streams in the finally-block)
• Manually, Java >=7

Example with AutoCloseable feature in Java 7:

public void copy(File sourceLocation, File targetLocation) throws IOException {
    if (sourceLocation.isDirectory()) {
        copyDirectory(sourceLocation, targetLocation);
    } else {
        copyFile(sourceLocation, targetLocation);
    }
}

private void copyDirectory(File source, File target) throws IOException {
    if (!target.exists()) {
        target.mkdir();
    }

    for (String f : source.list()) {
        copy(new File(source, f), new File(target, f));
    }
}

private void copyFile(File source, File target) throws IOException {        
    try (
            InputStream in = new FileInputStream(source);
            OutputStream out = new FileOutputStream(target)
    ) {
        byte[] buf = new byte[1024];
        int length;
        while ((length = in.read(buf)) > 0) {
            out.write(buf, 0, length);
        }
    }
}

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Apache Commons IO can do the trick for you. Have a look at FileUtils.

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look at java.io.File for a bunch of functions.

you will iterate through the existing structure and mkdir, save etc to achieve deep copy.

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JAVA NIO will help to you to solve your problem. Please have a look on this http://tutorials.jenkov.com/java-nio/files.html#overwriting-existing-files.