6 The HTTP Server - 6.10 Response Content-Type - 《Micronaut v2.2.3 Documentation》

6.10 Response Content-Type

6.10 Response Content-Type

A Micronaut’s controller action produces application/json by default. Nonetheless you can change the Content-Type of the response with the @Produces annotation or the produces member of the HTTP method annotations.

import io.micronaut.context.annotation.Requires;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.MediaType;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Get;
import io.micronaut.http.annotation.Produces;
@Controller("/produces")
public class ProducesController {
    @Get (1)
    public HttpResponse index() {
        return HttpResponse.ok().body("{\"msg\":\"This is JSON\"}");
    }
    @Produces(MediaType.TEXT_HTML)
    @Get("/html") (2)
    public String html() {
        return "<html><title><h1>HTML</h1></title><body></body></html>";
    }
    @Get(value = "/xml", produces = MediaType.TEXT_XML) (3)
    public String xml() {
        return "<html><title><h1>XML</h1></title><body></body></html>";
    }
}

import io.micronaut.context.annotation.Requires
import io.micronaut.http.HttpResponse
import io.micronaut.http.MediaType
import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get
import io.micronaut.http.annotation.Produces
@Controller("/produces")
class ProducesController {
    @Get (1)
    HttpResponse index() {
        HttpResponse.ok().body("{\"msg\":\"This is JSON\"}")
    }
    @Produces(MediaType.TEXT_HTML) (2)
    @Get("/html")
    String html() {
        "<html><title><h1>HTML</h1></title><body></body></html>"
    }
    @Get(value = "/xml", produces = MediaType.TEXT_XML) (3)
    String xml() {
        return "<html><title><h1>XML</h1></title><body></body></html>"
    }
}

import io.micronaut.context.annotation.Requires
import io.micronaut.http.HttpResponse
import io.micronaut.http.MediaType
import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get
import io.micronaut.http.annotation.Produces
@Controller("/produces")
class ProducesController {
    @Get (1)
    fun index(): HttpResponse<*> {
        return HttpResponse.ok<Any>().body("{\"msg\":\"This is JSON\"}")
    }
    @Produces(MediaType.TEXT_HTML)
    @Get("/html") (2)
    fun html(): String {
        return "<html><title><h1>HTML</h1></title><body></body></html>"
    }
    @Get(value = "/xml", produces = [MediaType.TEXT_XML]) (3)
    fun xml(): String {
        return "<html><title><h1>XML</h1></title><body></body></html>"
    }
}

1	The default content type is JSON
2	Annotate a controller’s action with `@Produces` to change the response content type.
3	Setting the `produces` member of the method annotation also changes the content type.