How to Efficiently Download Files from Spring Controllers?

Downloading a File from Spring Controllers: A Comprehensive Guide

Downloading a file from a website using Spring controllers requires efficient handling of file generation and delivery. While combining Freemarker with PDF generation frameworks is one approach, there are more optimal solutions.

The primary challenge lies in enabling users to download the file through a Spring controller. To address this, follow these steps:

1. Implement a Controller Method: Create a controller method annotated with @RequestMapping(value = "/files/{file_name}", method = RequestMethod.GET) to handle file requests.
2. Retrieve File Stream: Obtain the file as an InputStream using appropriate methods.
3. Copy File to Response Stream: Use org.apache.commons.io.IOUtils.copy() to copy the file's InputStream to the response's OutputStream. Remember to flush the buffer to ensure complete delivery.
4. Handle Exceptions: Catch any IOExceptions that may occur during file transfer and log the error.
5. Set Content Type: If desired, specify the file type by setting response.setContentType("application/pdf").

Example Controller Method:

This approach provides a robust and efficient way to handle file downloads in Spring applications.

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