How to copy file into another directory in Java 8?

Question

I want to copy file from one package to another package.

I tried Files.copy method but it replaces my folder with copied file.

public static void main(String[] args) throws IOException {

    InputStream in = CopyFileToDirectoryTest.class.getClassLoader()
            .getResourceAsStream("com/stackoverflow/main/Movie.class");

    Path path = Paths.get("D://folder");

    long copy = Files.copy(in, path,StandardCopyOption.REPLACE_EXISTING);
    System.out.println(copy);

}

This doesn't work because it deletes folder and creates file with the name of folder.

Is there a way in Java 8 or I should use Apache Commons IO?

Joop Eggen · Accepted Answer · 2017-05-14 19:35:59Z

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.

edited May 14, 2017 at 19:35

answered May 14, 2017 at 19:30

Joop Eggen

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6 Comments

Jay Smith Over a year ago

Thank you, but how to convert classpath resource(com/stackoverflow/json/Movie.class) to Path object?

Jay Smith Over a year ago

Because I need to copy Movie.class from one package into another inside the same project.

Louis Wasserman Over a year ago

@JaySmith: stackoverflow.com/questions/15713119/…

Joop Eggen Over a year ago

A .class maintains its package path in its full class name. So that will not work normally. If you are repackaging classes from a jar, there are more regular means.

Jay Smith Over a year ago

Thanks the link helped but it throws new exception java.nio.file.DirectoryNotEmptyException. Meaning com/stackoverflow/json is not empty.

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