The following code snippet shows how to get a unique file name when saving the file in java. It first checks if already a file exists with the specified name, then it appends a number to the end.
public static File getUniqueFilePath(String parent, String child, String fileName) {
File dir = new File(parent, child);
String uniqueName = getUniqueFileName(parent, child, fileName);
return new File(dir, uniqueName);
}
public static String getUniqueFileName(String parent, String child, String fileName) {
final File dir = new File(parent, child);
if (!dir.exists()) {
dir.mkdirs();
}
int num = 0;
final String ext = getFileExtension(fileName);
final String name = getFileName(fileName);
File file = new File(dir, fileName);
while (file.exists()) {
num++;
file = new File(dir, name + "-" + num + ext);
}
return file.getName();
}
public static String getFileExtension(final String path) {
if (path != null && path.lastIndexOf('.') != -1) {
return path.substring(path.lastIndexOf('.'));
}
return null;
}
public static String getFileName(String fileName) {
return fileName.substring(0, fileName.lastIndexOf('.'));
}
So, all that getUniqueFileName is doing is appending an integer to the filename. However it is not very efficient if a large number of files are going to be created and are not deleted. On every call, it starts counting from 0 to look for the next number that creates… Read more »