我在中创建servlet ServletContextInitializer 通过一些简化的配置动态地添加与该servlet相关的更多数据。

@Configuration
@EnableConfigurationProperties(value = ConformanceProperties.class)
public class Initializer implements ServletContextInitializer {

    @Autowired
    private ConformanceProperties conformanceProperties;

    // ...

    public void onStartup(ServletContext container) throws ServletException {

        for (ConformanceProperties.Capability capability : conformanceProperties.getCapabilities()) {
            ProxyServlet proxy = new ProxyServlet();

            ServletRegistration.Dynamic registration = container.addServlet(capability.getName(), proxy);
            registration.setLoadOnStartup(1);
            registration.addMapping(capability.getBase());
            registration.setInitParameter("foo", "bar");
        }
    }
}

稍后在服务bean中，我想从当前servlet上下文（如果可用）获取数据：

@Service
public class FooAdapter implements ResourceService {

    public static Optional<HttpServletRequest> getCurrentHttpRequest() {
        return Optional.ofNullable(RequestContextHolder.getRequestAttributes())
                .filter(ServletRequestAttributes.class::isInstance).map(ServletRequestAttributes.class::cast)
                .map(ServletRequestAttributes::getRequest);
    }

    @Override
    public Promise bar() {
        // ...

        HttpServletRequest request = getCurrentHttpRequest().get();

        if (request != null) {
            String foo = request.getServletContext().getInitParameter("foo");
        }
        // ...
    }
}

不幸的是，在服务bean中，我总是得到应用程序上下文，而不是servlet上下文。因此 foo 是 null 而不是 bar . 如何直接在服务bean中获取servlet上下文而不是上层应用程序上下文？