How to Download Files from Spring Boot REST Services?

Downloading Files from Spring Boot REST Services

In Spring Boot, downloading a file from a REST service is often necessary. Here's a detailed explanation of how to implement this functionality:

Method 1: Using InputStreamResource

<code class="java">@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
    // ...
    InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

    return ResponseEntity.ok()
        .headers(headers)
        .contentLength(file.length())
        .contentType(MediaType.APPLICATION_OCTET_STREAM)
        .body(resource);
}</code>

<code class="java">@RequestMapping(path = "/download", method = RequestMethod.GET)
public ResponseEntity<Resource> download(String param) throws IOException {
    // ...
    Path path = Paths.get(file.getAbsolutePath());
    ByteArrayResource resource = new ByteArrayResource(Files.readAllBytes(path));

    return ResponseEntity.ok()
        .headers(headers)
        .contentLength(file.length())
        .contentType(MediaType.APPLICATION_OCTET_STREAM)
        .body(resource);
}</code>

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