Spring MVC中的内容协商

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer
            .favorPathExtension(true)
            .favorParameter(true)
            .parameterName("mediaType")
            .ignoreAcceptHeader(true)
            .useJaf(true)
            .defaultContentType(MediaType.APPLICATION_JSON)
            .mediaType("xml", MediaType.APPLICATION_XML)
            .mediaType("json", MediaType.APPLICATION_JSON);
    }

    @Bean
    public ContentNegotiatingViewResolver contentNegotiatingViewResolver() {
        ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
        resolver.setContentNegotiationManager(contentNegotiationManager());
        return resolver;
    }

    @Bean
    public ContentNegotiationManager contentNegotiationManager() {
        List<ContentNegotiationStrategy> strategies = new ArrayList<>();
        strategies.add(new HeaderContentNegotiationStrategy());
        strategies.add(new ParameterContentNegotiationStrategy());
        strategies.add(new PathExtensionContentNegotiationStrategy());
        return new ContentNegotiationManager(strategies);
    }
}