将索引添加到现有文件的文件名中(file.txt =& gt file_1.txt) [英] Add index to filename for existing file (file.txt => file_1.txt)

问题描述

如果文件已经存在，我想在文件名中添加索引，这样我就不会覆盖它.

I want to add an index to a filename if the file already exists, so that I don't overwrite it.

就像我有文件 myfile.txt 一样，并且目标文件夹中同时存在 myfile.txt -我需要复制名称为 myfile_1的文件.txt

Like if I have a file myfile.txt and same time myfile.txt exists in destination folder - I need to copy my file with name myfile_1.txt

同时如果我有一个文件 myfile.txt ，但目标文件夹包含 myfile.txt 和 myfile_1.txt -生成的文件名必须为 myfile_2.txt

And same time if I have a file myfile.txt, but destintation folder contains myfile.txt and myfile_1.txt - generated filename has to be myfile_2.txt

因此，该功能与在Microsoft操作系统中创建文件夹非常相似.

So the functionality is very similar to the creation of folders in Microsoft operating systems.

做到这一点的最佳方法是什么?

What's the best approach to do that?

推荐答案

未经测试的代码:

File f = new File(filename);
String extension = "";
int g = 0;
int i = f.lastIndexOf('.');
extension = fileName.substring(i+1);

while(f.exists()) {      
  if (i > 0) 
  {  f.renameTo(f.getPath() + "\" + (f.getName() + g) + "." + extension); }
  else
  {  f.renameTo(f.getPath() + "\" + (f.getName() + g)); }     

  g++;    
}

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