The modified part is:
1. The website root directory management is changed to the management of the contents of the UserFile folder.
2. The new folder must be a safe folder named FileManager.IsUnsafeName
3. The new file must be a safe file name FileManager.IsSafeName
4. If you delete files in the directory, an error will be reported.
5. When copying a file, an error will be reported if the file already exists.
6. When copying a folder, an error will be reported if the file already exists.
7. The uploaded file must be a safe file FileManager.IsSafeName
8. Added the function of modifying text file content, which is more practical.
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