拦截器没有被调用

Question

基于一些业务逻辑，我需要在请求到达控制器之前将查询参数添加到请求中。为了实现这一点，我使用了 HandlerInterceptorAdapter 来拦截请求。 我有一个公共库，我在其中定义了一个拦截器，并且依赖项目具有控制器。 拦截器正在注册，但是当我调用任何 api 调用时，它不会被调用。

公共库中的拦截器

@Component
public class RequestInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, java.lang.Object handler)
            throws ServletException, IOException {
         request.setAttribute("id", "123"); // this would be populated based on logic

        return true;
    }
}

依赖

@Configuration
public class Resolver implements WebMvcConfigurer {

@Autowired
RequestInterceptor interceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor);
    }

}

Answer 1

您不必注释RequestInterceptor。请从 RequestInterceptor 和 @Autowired 类中删除 @Component 注释从 Resolver 类到此依赖项。 请不要注入，而是通过默认构造函数实例化它。

public class RequestInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, java.lang.Object handler)
            throws ServletException, IOException {
         request.setAttribute("id", "123"); // this would be populated based on logic

        return true;
    }
}

@Configuration
@EnableWebMvc
public class Resolver implements WebMvcConfigurer {


    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new RequestInterceptor());
    }

}