如何在spring mvc中使用自定义注释从http请求中获取请求头的值？

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface CustomHeader {
    String value() default "";
}

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class CustomHeaderInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            CustomHeader customHeader = handlerMethod.getMethodAnnotation(CustomHeader.class);
            if (customHeader != null) {
                String headerValue = request.getHeader(customHeader.value());
                // 在这里可以对获取到的请求头值进行处理
                // 例如，可以将其存储到请求上下文中，以便后续使用
                request.setAttribute("customHeaderValue", headerValue);
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        // 在请求处理之后进行处理
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 在请求完成之后进行处理
    }
}

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/**"/> <!-- 可以根据实际需求配置拦截的路径 -->
        <bean class="com.example.CustomHeaderInterceptor"/>
    </mvc:interceptor>
</mvc:interceptors>

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new CustomHeaderInterceptor()).addPathPatterns("/**"); // 可以根据实际需求配置拦截的路径
    }
}

@Controller
public class MyController {

    @GetMapping("/example")
    public String exampleMethod(@CustomHeader("X-Custom-Header") String customHeaderValue) {
        // 在这里可以使用获取到的请求头值进行业务处理
        return "example";
    }
}