springboot controller拦截器(spring 拦截器 过滤器)

public class JWTInterceptor implements HandlerInterceptor{

	@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
  String token = request.getHeader("token");
  Map map = new HashMap<>();
  try {
    JWTUtils.verify(token);
    return true;
  } catch (TokenExpiredException e) {
    map.put("state", false);
    map.put("msg", "Token已经过期!!!");
  } catch (SignatureVerificationException e){
    map.put("state", false);
    map.put("msg", "签名错误!!!");
  } catch (AlgorithmMismatchException e){
    map.put("state", false);
    map.put("msg", "加密算法不匹配!!!");
  } catch (Exception e) {
    e.printStackTrace();
    map.put("state", false);
    map.put("msg", "无效token~~");
  }
  String json = new ObjectMapper().writevalueAsString(map);
  response.setContentType("application/json;charset=UTF-8");
  response.getWriter().println(json);
  return false;
}

}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new JwtTokenInterceptor()).
          excludePathPatterns("/user/**")  // 放行
          .addPathPatterns("/**"); // 拦截除了"/user/**的所有请求路径
    }
}