What is the function of the @EnableWebFlux annotation

问题

I have a very simple webflux demo application with freemarker which has got following files:

1.WebFluxDemoApplication.java

@SpringBootApplication
public class WebFluxDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebFluxDemoApplication.class, args);
    }

    @Controller
    class HomeController {
        @GetMapping("/hello")
        public String hello() {
            return "index";
        }
    }
}

2.index.ftl(located under classpath:/templates)

<html>
    <head>
        <title>demo</title>
    </head>
    <body></body>
</html>

3.application.yml(without any configuration)

4.pom.xml(with spring-boot-starter-freemarker and spring-boot-starter-webflux)

I can get normal page via http://localhost:8080/hello using these files, but if I add @EnableWebFlux to WebFluxDemoApplication, there's an error shows java.lang.IllegalStateException: Could not resolve view with name 'index'.

I notice that the Spring WebFlux's official guide states to use @EnableWebFlux to configure freemarker. Actually it works for template files, but there seems something wrong with static resources.

For example, I put a main.js file under classpath:/templates/js/, and add <script src="/js/main.js"></script> in index.ftl, then I get an error says WARN 3046 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8080/js/main.js]: Response status 404 with reason "No matching handler"

UPDATE For static resources problem, I found a solution which is to add a RouterFunction that resolves the static resources as the post stated.

回答1:

As stated in the Spring Boot reference documentation, @EnableWebFlux will tell Spring Boot that you wish to take full control over the WebFlux configuration and disable all auto-configuration for this (including static resources).

@EnableWebFlux doesn't configure Freemarker, it actually sets up the whole WebFlux infrastructure. In the case of Spring Boot, adding the spring-boot-starter-freemarker as a dependency (and optionally configuring it through configuration properties) is all you need.

来源：https://stackoverflow.com/questions/51843344/what-is-the-function-of-the-enablewebflux-annotation

标签

Spring

spring-boot

freemarker

spring-webflux