Alternatives for HttpServletRequest and HttpServletResponse in Micronaut

Question

I am playing with Micronaut and what I currently miss is access to HttpServletRequest and HttpServletResponse . These normally allow to access things like:

• request parameters
• input/output stream (especially writing directly to output stream)
• getting/setting cookies
• getting/setting headers
• getting client IP

Also I am not sure about alternatives for:

• @RequestParam files: List<MultipartFile>
• @RequestBody myClass: MyClass

Answer 1

@RequestBody -> @Body ( https://docs.micronaut.io/latest/guide/index.html#bodyAnnotation )

@RequestParam -> @QueryValue

https://micronaut-projects.github.io/micronaut-spring/latest/guide/index.html

Answer 2

https://docs.micronaut.io/latest/guide/index.html#requestResponse and https://docs.micronaut.io/latest/guide/index.html#binding shows how to bind to request parameters, cookies, headers, etc.

https://docs.micronaut.io/latest/guide/index.html#uploads shows how to handle file uploads.

input/output stream (especially writing directly to output stream)

Micronaut does things differently so you don't have access to a stream to write to. You can return a reactive type to have your data pushed to the response as soon as it's available.

getting client IP

Typically available via the host header or https://docs.micronaut.io/latest/api/io/micronaut/http/HttpRequest.html#getRemoteAddress--

Edit: Sending an XML file chunked

@Get(uri = "/xml", produces = MediaType.TEXT_XML)
Flowable<String> getXml() {
    return Flowable.create(emitter -> {
        emitter.onNext("<<xml header>>");
        //do some work
        emitter.onNext("more xml");
        emitter.onNext("<<xml footer>>");
    }, BackpressureStrategy.BUFFER);
}

Answer 3

You can use a Filter for using HTTP request/response

@Singleton
public class TraceService {

Flowable<Boolean> yourFilter(HttpRequest<?> request) {

The Micronaut HTTP server supports the ability to apply filters to request/response processing in a similar, but reactive, way to Servlet filters in traditional Java applications.

Filters provide the ability to support the following use cases:

Decoration of the incoming HttpRequest

Modification of the outgoing HttpResponse