Add fall back to zuul
Want to add a fallback Zuul, the need to achieve ZuulFallbackProvider interface in the implementation class, which is designated as a fallback offer micro-services, and provide a ClientHttpResponse as a fallback response.
1. Copy the project microservice-gateway-zuul, will ArtifactId modified to microservice-gateway-zuul-fallback.
2. Write zuul rollback categories:
package com.xhx.springcloud.hystrix;
import com.alibaba.fastjson.JSONObject;
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;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* xuhaixing
* 2018/6/12 21:36
*/
@Component
public class ZuulFallBack implements FallbackProvider {
@Override
public String getRoute() {
return "eureka-feign"; //服务id,可以用* 或者 null 代表所有服务都过滤
}
@Override
public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
return new ClientHttpResponse() {
@Override
public HttpStatus getStatusCode() throws IOException {
return HttpStatus.OK; //请求网关成功了,所以是ok
}
@Override
public int getRawStatusCode() throws IOException {
return HttpStatus.OK.value();
}
@Override
public String getStatusText() throws IOException {
return HttpStatus.OK.getReasonPhrase();
}
@Override
public void close() {
}
@Override
public InputStream getBody() throws IOException {
JSONObject json =new JSONObject();
json.put("state","501");
json.put("msg","后台接口错误");
return new ByteArrayInputStream(json.toJSONString().getBytes("UTF-8")); //返回前端的内容
}
@Override
public HttpHeaders getHeaders() {
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.APPLICATION_JSON_UTF8); //设置头
return httpHeaders;
}
};
}
}