To achieve high-performance uploads where files are streamed directly from the request without being saved to the local disk (non-disk-landing), you can pass the HttpServletRequest directly to fileStorageService.of().
Critical Configuration:
You MUST enable lazy multipart resolution in your Spring configuration, otherwise the input stream will be consumed before it reaches the service:
spring.servlet.multipart.resolve-lazily: true
Accessing Request Parameters:
To access non-file parameters from the request, wrap the request using fileStorageService.wrapper(request) to get a HttpServletRequestFileWrapper. This allows you to retrieve multipart form data and parameters without prematurely reading the input stream.
Warning: Do not define individual request parameters (e.g., @RequestParam String aaa) in your Controller method signature, as this will trigger the input stream to be read early and cause the upload to fail.
@PostMapping("/upload-request")
public FileInfo uploadRequest(HttpServletRequest request) {
return fileStorageService.of(request).upload();
}
@PostMapping("/upload-request2")
public FileInfo uploadRequest2(HttpServletRequest request) {
HttpServletRequestFileWrapper wrapper = (HttpServletRequestFileWrapper) fileStorageService.wrapper(request);
// Access parameters via wrapper
String aaa = wrapper.getParameter("aaa");
// Access multipart form data
MultipartFormDataReader.MultipartFormData formData = wrapper.getMultipartFormData();
Map<String, String[]> parameterMap = formData.getParameterMap();
return fileStorageService.of(wrapper).upload();
}
