ClientFallback.java

package com.github.zuul.handler;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

/**
 * @author <a href="http://github.com/athc">dujf</a>
 * @date 2018/9/19
 * @since JDK1.8
 */
@Component
public class ClientFallback implements FallbackProvider {

  @Override public String getRoute() {
    return "service-eureka-client";
  }

  @Override public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
    return new ClientHttpResponse() {
      @Override public HttpStatus getStatusCode() throws IOException {
        return HttpStatus.OK;
      }

      @Override public int getRawStatusCode() throws IOException {
        return 200;
      }

      @Override public String getStatusText() throws IOException {
        return "SUCCESS";
      }

      @Override public void close() {

      }

      @Override public InputStream getBody() throws IOException {
        return new ByteArrayInputStream("The service is unavailable.".getBytes());
      }

      @Override public HttpHeaders getHeaders() {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        return headers;
      }
    };
  }
}