SpringBoot 拦截器中无法使用 @Autowired 注入 Service

进行如下修改即可。

首先是 WebMvcConfiguration：

@Configuration
public class WebMvcConfiguration extends WebMvcConfigurerAdapter {

    @Bean
    public AuthenticationInterceptor authenticationInterceptor() {
        return new AuthenticationInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(authenticationInterceptor()).addPathPatterns("/**");
    }

}

然后需要使 springboot 扫描到当前 Interceptor，也就是在类上加上 @Component 注释。

@Component
public class AuthenticationInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        User user = userService.getById(id);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object o, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object o, Exception e) throws Exception {
    }

}