跟我学Spring Cloud（Finchley版）-18-Zuul深入

/**
 * @author itmuch.com
 */
@Component
public class MyFallbackProvider implements FallbackProvider {
  @Override
  public String getRoute() {
    // 表明是为哪个微服务提供回退，*表示为所有微服务提供回退
    return "*";
  }

  @Override
  public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
    if (cause instanceof HystrixTimeoutException) {
      return response(HttpStatus.GATEWAY_TIMEOUT);
    } else {
      return this.fallbackResponse();
    }
  }

  public ClientHttpResponse fallbackResponse() {
    return this.response(HttpStatus.INTERNAL_SERVER_ERROR);
  }

  private ClientHttpResponse response(final HttpStatus status) {
    return new ClientHttpResponse() {
      @Override
      public HttpStatus getStatusCode() throws IOException {
        return status;
      }

      @Override
      public int getRawStatusCode() throws IOException {
        return status.value();
      }

      @Override
      public String getStatusText() throws IOException {
        return status.getReasonPhrase();
      }

      @Override
      public void close() {
      }

      @Override
      public InputStream getBody() throws IOException {
        return new ByteArrayInputStream("服务不可用，请稍后再试。".getBytes());
      }

      @Override
      public HttpHeaders getHeaders() {
        // headers设定
        HttpHeaders headers = new HttpHeaders();
        MediaType mt = new MediaType("application", "json", Charset.forName("UTF-8"));
        headers.setContentType(mt);
        return headers;
      }
    };
  }
}