Description: Simple implementation file (folder) copy, move, delete, size and other operations for
Copy files or directories, copy files around the same.
Delete a file or directory.
Moving files or directories, move files around the same, if the target folder does not exist is created.
Rename the file or folder.
Read the file or directory size.
Determine whether a file exists.
Local list of files in a directory (not recursive).
Recursive directory of all files.
Write the string specified file (when the path specified in the parent folder does not exist, it will maximize to create, save to ensure success!)
Get file size
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FileUtil.java