Building a Chunked Upload System Using JavaUploader

How to Integrate JavaUploader into Your Spring Boot App

Assumption: “JavaUploader” is a Java file-upload library (if you meant a specific product with different APIs, say so).

1) Add dependency

• Maven:

xml
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<dependency>
<groupId>com.example</groupId>
  <artifactId>javauploader</artifactId>
  <version>1.0.0</version>
</dependency>

• Gradle:

groovy
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implementation ‘com.example:javauploader:1.0.0’

2) Configure multipart support (application.properties)

Code
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spring.servlet.multipart.enabled=true spring.servlet.multipart.max-file-size=10MB spring.servlet.multipart.max-request-size=20MB 

3) Create storage service using JavaUploader API

java
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@Service
public class UploadService {
  private final JavaUploader client = JavaUploader.builder()
    .destinationPath(”/data/uploads”)
    .maxChunkSize(5  1024  1024)
    .build();

  public String store(MultipartFile file) throws IOException {
    try (InputStream in = file.getInputStream()) {
      UploadResult r = client.upload(file.getOriginalFilename(), in, file.getSize());
      return r.getUrl(); // or r.getId()
    }
  }
}

4) Expose REST endpoint

java
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@RestController
@RequestMapping(”/api/files”)
public class FileController {
  private final UploadService uploadService;
  public FileController(UploadService s){this.uploadService=s;}

  @PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
  public ResponseEntity<?> upload(@RequestParam(“file”) MultipartFile file) throws IOException {
    String url = uploadService.store(file);
    return ResponseEntity.ok(Map.of(“url”, url));
  }
}

5) Security & validation

• Validate content type and size (check magic bytes if possible).
• Restrict upload paths; avoid exposing direct filesystem paths.
• Use authentication/authorization on the upload endpoint.

6) Optional: Chunked uploads & resumable

• If JavaUploader supports chunking, implement client-side chunking and server-side assembly via the library’s chunk API (configure maxChunkSize and upload session IDs).

7) Testing

• Unit test UploadService with a mocked JavaUploader client.
• Integration: use MockMvc to POST multipart files and verify responses and stored file presence.

If you want, I can generate a complete working example (pom, service, controller, and tests) — specify Maven or Gradle and Java version.