How to convert a Java File URI inot a absolute path?-CodePudding

I have a situation in which I receive a File URI in the format

file:///home/user/a.txt

I know that depending of the operation system other formats can be expected:

file:/C:/a.txt            <- On Windows
file:///C:/a.txt          <- On Windows
file:///home/user/a.txt   <- On Linux

I need the absolute file path to store the file. So I want to convert:

file:///home/user/a.txt   ===>   /home/user/a.txt

I do now this in a very clumsy way:

    public void save(URI targetURI) {
        Path path = Paths.get("/", targetURI.toString()).normalize();
        String filePath="" path;
        filePath=filePath.replace("/file:", "");
    ....
    }

I expect there is a more elegant solution based on the java.io util classes?

CodePudding user response：

check this -> Convert URL to AbsolutePath

Path p = Paths.get(url.toURI());

and how say @GOTO 0

Another option for those who use Java 11 or later:

Path path = Path.of(url.toURI()); or as a string:

String path = Path.of(url.toURI()).toString(); Both methods above throw a URISyntaxException that can be safely ignored if the URL is guaranteed to be a file URL.

UPDATE

And i found this -> https://eed3si9n.com/encoding-file-path-as-URI-reference/ The solution to the problem is described in great detail here


public static void main(String[] args) throws URISyntaxException
{
    URI uri = new URI("file:/C:/a.txt");
    save(uri);

    uri = new URI("file:///C:/a.txt");
    save(uri);

    uri = new URI("file:///home/user/a.txt");
    save(uri);

}

public static void save(URI targetURI)
{
    Path p = Paths.get(targetURI);
    String absolutePath = p.toString();
    System.out.println(absolutePath);
}

CodePudding user response：

ok, quite simple

public void save(URI targetURI) {
   Path p=Paths.get(targetURI).toString());
   String absolutePath= p.toString();
   ...
}