How to convert a multipart file to File in java?

How to convert a multipart file to File in java?

To convert a MultipartFile to a File in Java, you can follow these steps:

  1. Create a temporary file.
  2. Write the bytes from the MultipartFile to the temporary file.
  3. Use the temporary file as a File object.

Here's a code example using Spring's MultipartFile from the org.springframework.web.multipart package:

import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class MultipartFileToFileConverter { public static File convert(MultipartFile multipartFile) throws IOException { File file = File.createTempFile("temp", null); try (InputStream inputStream = multipartFile.getInputStream(); OutputStream outputStream = new FileOutputStream(file)) { int bytesRead; byte[] buffer = new byte[8192]; while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) { outputStream.write(buffer, 0, bytesRead); } } return file; } public static void main(String[] args) { try { MultipartFile multipartFile = /* Your MultipartFile here */; File convertedFile = convert(multipartFile); // Now you can use 'convertedFile' as a regular File object. // For example, you can perform file operations like reading or uploading it. } catch (IOException e) { e.printStackTrace(); } } }

In this example:

  • We create a temporary file using File.createTempFile().
  • We obtain an InputStream from the MultipartFile and an OutputStream from the temporary file.
  • We read data from the input stream and write it to the output stream in chunks until all data is copied.
  • After copying the data, you can use the convertedFile as a regular File object.

Make sure to handle exceptions appropriately in your code, and replace /* Your MultipartFile here */ with the actual MultipartFile you want to convert.

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