Get file name from URL

Question

In Java, given a java.net.URL or a String in the form of http://www.example.com/some/path/to/a/file.xml , what is the easiest way to g

Answer 1

If you are using Spring, there is a helper to handle URIs. Here is the solution:

List<String> pathSegments = UriComponentsBuilder.fromUriString(url).build().getPathSegments();
String filename = pathSegments.get(pathSegments.size()-1);

Answer 2

Urls can have parameters in the end, this

 /**
 * Getting file name from url without extension
 * @param url string
 * @return file name
 */
public static String getFileName(String url) {
    String fileName;
    int slashIndex = url.lastIndexOf("/");
    int qIndex = url.lastIndexOf("?");
    if (qIndex > slashIndex) {//if has parameters
        fileName = url.substring(slashIndex + 1, qIndex);
    } else {
        fileName = url.substring(slashIndex + 1);
    }
    if (fileName.contains(".")) {
        fileName = fileName.substring(0, fileName.lastIndexOf("."));
    }

    return fileName;
}

Answer 3

If you want to get only the filename from a java.net.URL (not including any query parameters), you could use the following function:

public static String getFilenameFromURL(URL url) {
    return new File(url.getPath().toString()).getName();
}

For example, this input URL:

"http://example.com/image.png?version=2&modificationDate=1449846324000"

Would be translated to this output String:

image.png

Answer 4

The Url object in urllib allows you to access the path's unescaped filename. Here are some examples:

String raw = "http://www.example.com/some/path/to/a/file.xml";
assertEquals("file.xml", Url.parse(raw).path().filename());

raw = "http://www.example.com/files/r%C3%A9sum%C3%A9.pdf";
assertEquals("résumé.pdf", Url.parse(raw).path().filename());

Answer 5

andy's answer redone using split():

Url u= ...;
String[] pathparts= u.getPath().split("\\/");
String filename= pathparts[pathparts.length-1].split("\\.", 1)[0];

Answer 6

create a new file with string image path

    String imagePath;
    File test = new File(imagePath);
    test.getName();
    test.getPath();
    getExtension(test.getName());


    public static String getExtension(String uri) {
            if (uri == null) {
                return null;
            }

            int dot = uri.lastIndexOf(".");
            if (dot >= 0) {
                return uri.substring(dot);
            } else {
                // No extension.
                return "";
            }
        }