HandlerInterceptor注入bean报错

过滤器注入Bean

/**
 * 登录拦截器
 * @author swt
 */
@Component
public class AccessTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private LoginInfoService loginInfoService;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
    // loginInfoService = null ???
        
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        // 请求处理之后进行调用，但是在视图被渲染之前
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        // 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
    }

}

　　

 

错误的写法

/**
 * 过滤器
 * @author swt
 */
@Configuration
public class MvcConfiguration extends WebMvcConfigurerAdapter {

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

}

　　

正确的写法

/**
 * 过滤器
 * @author swt
 */
@Configuration
public class MvcConfiguration extends WebMvcConfigurerAdapter {

    @Autowired
    private AccessTokenInterceptor accessTokenInterceptor;

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

}