Get file name from FileOutputStream in java

Get file name from FileOutputStream in java

In Java, a FileOutputStream is used for writing data to a file, but it does not directly provide a method to retrieve the file name it is writing to. This is primarily because FileOutputStream can be created from a FileDescriptor or a file path, and it doesn't maintain a reference to the file's name in all cases.

However, if you have control over the creation of the FileOutputStream, you can maintain this information yourself. Here's a simple way to do it:

Approach: Store File Name When Creating FileOutputStream

When you create a FileOutputStream, you can store the file name in a separate variable for later use:

import java.io.File; import java.io.FileOutputStream; import java.io.IOException; public class FileOutputStreamExample { public static void main(String[] args) { String filePath = "example.txt"; File file = new File(filePath); try (FileOutputStream fos = new FileOutputStream(file)) { // Write data to the file fos.write("Hello, World!".getBytes()); // Retrieve the file name String fileName = file.getName(); System.out.println("File name: " + fileName); } catch (IOException e) { e.printStackTrace(); } } }

In this example, the file name is stored in the filePath variable, and you can retrieve the name using file.getName().

Note

  • If the FileOutputStream was created using a FileDescriptor, there isn't a straightforward way to retrieve the associated file's name, as the FileDescriptor does not maintain this information.
  • It's important to handle the potential IOException that may be thrown when working with file I/O in Java. The try-with-resources statement (try (FileOutputStream fos = new FileOutputStream(file))) is used in this example to ensure that the FileOutputStream is closed properly.

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