content: package jnpf.handler;
  
  import jnpf.util.JsonUtil;
  import jnpf.base.ActionResult;
  import lombok.extern.slf4j.Slf4j;
  import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
  import org.springframework.cloud.gateway.support.NotFoundException;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.core.annotation.Order;
  import org.springframework.core.io.buffer.DataBufferFactory;
  import org.springframework.http.HttpStatus;
  import org.springframework.http.MediaType;
  import org.springframework.http.server.reactive.ServerHttpResponse;
  import org.springframework.web.server.ResponseStatusException;
  import org.springframework.web.server.ServerWebExchange;
  import reactor.core.publisher.Mono;
  
  /**
   * 网关统一异常处理
   *
   * @author JNPF开发平台组
   * @version V3.1.0
   * @copyright 引迈信息技术有限公司（https://www.jnpfsoft.com）
   * @date 2021-03-24
   */
  @Slf4j
  @Order(-1)
  @Configuration
  public class GatewayHandler implements ErrorWebExceptionHandler {
  
      @Override
      public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
          ServerHttpResponse response = exchange.getResponse();
  
          if (exchange.getResponse().isCommitted()) {
              return Mono.error(ex);
          }
  
          String msg;
  
          if (ex instanceof NotFoundException) {
              msg = "服务未找到";
          } else if (ex instanceof ResponseStatusException) {
              ResponseStatusException responseStatusException = (ResponseStatusException) ex;
              msg = responseStatusException.getMessage();
          } else {
              msg = "内部服务器错误";
          }
  
          response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
          response.setStatusCode(HttpStatus.OK);
  
          return response.writeWith(Mono.fromSupplier(() -> {
              DataBufferFactory bufferFactory = response.bufferFactory();
              ActionResult result = ActionResult.fail(msg);
              return bufferFactory.wrap(JsonUtil.getObjectToString(result).getBytes());
          }));
      }
  }
  