spring - 如何在@Service 中的@Configuration 处动态设置@Bean？

Question

我在我的应用程序中使用 spring cloud 和 feign 客户端。我想在调用 feign 客户端时将参数“accept-language”设置为标题。我在 [Using @Headers with dynamic values in Feign client + Spring Cloud (Brixton RC2)

问] 1，但我不知道如何设置标头参数。这是我的代码：我在 app.java 中设置了 MyDefaultFeignConfig @EnableFeignClients(basePackages = {defaultConfiguration = MyDefaultFeignConfig.class)

和 MyDefaultFeignConfig.java ：

@Configuration
public class MyDefaultFeignConfig {

private String requestLanguage = "zh";

@Bean
RequestInterceptor feignRequestInterceptor() {
    return new RequestInterceptor() {
        @Override
        public void apply(RequestTemplate template) {
            template.header("accept-language", requestLanguage);
        }
    };
}

//doesn't work
public static void updateBean(String requestLanguage) {
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MyDefaultFeignConfig.class);

    try {
        System.out.println(applicationContext.getBean("feignRequestInterceptor"));
    } catch (NoSuchBeanDefinitionException e) {
        System.out.println("Bean not found");
    }

    BeanDefinitionRegistry beanFactory = (BeanDefinitionRegistry) applicationContext.getBeanFactory();

    beanFactory.registerBeanDefinition("feignRequestInterceptor",
            BeanDefinitionBuilder.genericBeanDefinition(String.class)
                    .addConstructorArgValue(new RequestInterceptor() {
                        @Override
                        public void apply(RequestTemplate template) {
                            template.header("accept-language", requestLanguage);
                        }
                    })
                    .getBeanDefinition()
    );

}
}

我的网关控制器是：

@Autowired
 private LeaseOrderRemoteService leaseOrderRemoteService;
 @RequestMapping(value = "/Discovery/order/unifiyInit", method = RequestMethod.GET)
public Message unifiyOrderInit(@RequestHeader("accept-language") String language) {
    MyDefaultFeignConfig.updateBean(language);
    return leaseOrderRemoteService.unifiyOrderInit();
}

我的假客户控制器是：

public Message unifiyOrderInit(@RequestHeader("accept-language") String language) {
    //...
}

而且我只能在第一次设置@Bean时将“accept-language”的值作为MyDefaultFeignConfig config。如何将“accept-language”的值从Gateway设置为feign client。请帮助我，想想！任何建议都表示感谢和最好的问候！