How to redirect page to static file in Spring Boot?

Question

How can I redirect a page web request / request mapping in Spring Boot (MVC) to point to a static file (example: .txt, .json, .jpg, .mp4, etc). All I have in my Spring Boot project is an application.properties file and the @Controllers.

I'd like for the user, when making a web request to the url in browser to be asked to download the file (not use it to attempt to render the page, like it does with .html, .jsp)

Answer 1

You can achive this by telling the response that you wish to attach a downloadable file. Then you can simple write the content you want to make downloadable.

Here is an example :

@ResponseStatus(HttpStatus.OK)
@RequestMapping(value = "/myredirect", method = RequestMethod.GET, produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
public void downloadFile(HttpServletResponse response) {
    // Remove this instruction if you wish to disable the download dialog.
    response.setHeader("Content-Disposition", "attachment; filename=filename.ext");

    // Load your file content as byte.
    byte[] fileContent = IOUtils.toByteArray(new ClasspathResource("myfile").getIntputStream());

    response.getOutputStream().write(fileContent);
}

On the other hand, if you simply want a direct mapping to a static file. You may use the default public folder of Spring Boot Starter Web.

Any file found inside classpath:/public will be mapped to /*by default.