SpringCloud+Feign+Hystrix使用FallbackFactory統一處理，查看服務調用異常或失敗，進入熔斷降級處理的原因

1、 @FeignClient類

此類中的@FeignClient中fallbackFactory屬性指定熔斷降級處理的類為WebFeignFallbackFactory。

package com.tianchang.wei.service.feign.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import com.tianchang.wei.service.feign.Hystric.WebFeignFallbackFactory;

@FeignClient(value = "server-feign" ,fallbackFactory = WebFeignFallbackFactory.class)
public interface WebFeignService {
	@PostMapping(value = "/bigDataTest",produces = MediaType.APPLICATION_JSON_VALUE)
	public Object bigDataTest(@RequestBody Object o);
}
 

2、 WebFeignFallbackFactory 類

此類實現FallbackFactory類，並實現方法T create(Throwable arg0);其中arg0.getMessage();就是服務回退時的異常信息。

package com.tianchang.wei.service.feign.Hystric;

import org.springframework.stereotype.Component;

import com.tianchang.wei.service.feign.service.WebFeignService;

import feign.hystrix.FallbackFactory;

@Component
public class WebFeignFallbackFactory implements FallbackFactory<WebFeignService>{

	@Override
	public WebFeignService create(Throwable arg0) {
		return new WebFeignService(){
			@Override
			public Object bigDataTest(Object o) {
				return arg0.getMessage();
			}
		};
	}
}