How to Fix File Download Errors in Your Spring Boot REST Service?

Solving File Download Issues in Spring Boot Rest Service

File downloads from Spring Boot REST services can encounter errors. To resolve these issues, we examine a provided server-side code:

<code class="java">@RequestMapping(path="/downloadFile",method=RequestMethod.GET)
public  ResponseEntity<InputStreamReader> downloadDocument(...) {
    ...
    return ResponseEntity.ok()...body(i);
}</code>

Identifying the Issue

The issue may lie with using InputStreamReader, which may cause browser downloads to fail.

Solution Options

1. Using an InputStreamResource:

<code class="java">@RequestMapping(path="/download",method=RequestMethod.GET)
public ResponseEntity<Resource> download(...) {
    ...
    InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
    return ResponseEntity.ok()...body(resource);
}</code>

2. Using a ByteArrayResource:

<code class="java">@RequestMapping(path="/download",method=RequestMethod.GET)
public ResponseEntity<Resource> download(...) {
    ...
    ByteArrayResource resource = new ByteArrayResource(Files.readAllBytes(path));
    return ResponseEntity.ok()...body(resource);
}</code>

Implementation Details

• InputStreamResource allows using InputStream directly, but is suggested not to use for large files.
• ByteArrayResource loads the entire file into memory and is better for small files.

By implementing one of these solutions, the file download should proceed successfully from the Spring Boot REST service.

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