遇到一个需求是：要为用户设置不同的菜单、数据访问权限。对于一些特定类型的数据，有的用户可以看有的用户则不可以。一开始没有太多思路，后来一想是不是可以把"特定类型"这个参数通过@PathVariable注解加到路径上，这样就可以通过拦截器拦截后，校验此用户是否可以访问这个路径（类型）下的数据了。

话不多说，以下为具体实践

拦截器配置类

@Configuration
public class UserInterceptorConfig {
  //为了保证IDbnetUserService提前实例化，能在userInterceptor使用
  //ConditionalOnMissingBean可以保证只有一个IDbnetUserService的实例
  @Bean
  @ConditionalOnMissingBean(IDbnetUserService.class)
  public IDbnetUserService dbnetUserService() {
    return new DbnetUserServiceImpl();
  }
  //拦截器
  @Bean(name = "userInterceptor")
  public HandlerInterceptor userInterceptor(IDbnetUserService dbnetUserService) {
    return new HandlerInterceptor() {
      @Override
      public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //url = request.getRequestURI() 判断url是否可以有权限访问而返回true或者false
      }
    };
  }
}

注册拦截器

//注册拦截器
  @Bean
  public WebMvcConfigurer registerInterceptor(@Qualifier("userInterceptor") HandlerInterceptor userInterceptor) {
    return new WebMvcConfigurerAdapter() {
      @Override
      public void addInterceptors(InterceptorRegistry registry) {
        //要拦截的路径
        List path = interceptorProperties.getPath();
        //要排除的路径
        List excludePath = interceptorProperties.getExcludePath();
        registry.addInterceptor(userInterceptor).addPathPatterns(path.stream().toArray(String[]::new))
            .excludePathPatterns(excludePath.stream().toArray(String[]::new));
      }

    };
  }

配置要拦截的路径

@Component
@ConfigurationProperties(prefix = "dbnet.interceptor")
public class InterceptorProperties {
  /**
   * 需要拦截的接口通配
   */
  private List path = new ArrayList<>();
  /**
   * 需要忽略的接口通配
   */
  private List excludePath = new ArrayList<>();
  public List getPath() {
    return path;
  }
  public void setPath(List path) {
    this.path = path;
  }
  public List getExcludePath() {
    return excludePath;
  }
  public void setExcludePath(List excludePath) {
    this.excludePath = excludePath;
  }
}

dbnet:
 interceptor:
  path: /dbnet/**,/datanet/**
  excludePath: /dbnet/detail,/datanet/recommend,/datanet/count,/datanet/getKeys,/datenet/metadata/**