生成复制文件的文件名

Question

I am looking to get similar behaviour to what you get in Windows when you copy and paste a file in the same directory.

For eg, if you've copy/paste a file called foo.txt , it will create foo Copy.txt and if you paste it once more, it creates foo Copy(2).txt and if you copy/paste foo Copy.txt , foo Copy Copy.txt is created.

Is there a Java utility function that does this? I've looked at File.createTempFile but the filename it generates is too long and contains a UID-like substring.

Answer 1

通过将FileChooser与“ showSaveDialog”方法结合使用，您将获得所需的结果，因为Java随后将OS行为用于现有文件。

Answer 2

Sometimes, you just have to do the work first, it will give you an appreciation for the API. Then you can write your own utility methods

File original = new File("build.xml");
String path = original.getAbsoluteFile().getParent();
String name = original.getName();
String ext = name.substring(name.indexOf("."));
name = name.substring(0, name.indexOf("."));
name = path + File.separator + name;

int index = 1;
File copy = new File(name + " (" + index + ")" + ext);
while (copy.exists()) {
    index++;
    copy = new File(name + " (" + index + ")" + ext);
}
System.out.println(copy);