熔断第一篇可以正常实现熔断，但是有个缺点是无法获取异常信息，基于第一篇接着改为fallbackFactory实现

1、userService代码如下

package com.cloud.service;

import com.cloud.service.backup.UserServiceBack;
import com.cloud.service.backup.UserServiceBackFactory;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author: zhouwei
 * @version: v1.0
 * @description: com.cloud.service.hello
 * @date:2021-01-25
 */
@FeignClient(value = "service-hi", fallbackFactory = UserServiceBackFactory.class) // 要调用的服务的名称
public interface UserService {
    @GetMapping("/user/{id}") // mapping地址
    String getUser(@RequestParam long id);

}

2、增加UserServiceBackFactory类

代码如下

package com.cloud.service.backup;

import com.cloud.service.UserService;
import feign.hystrix.FallbackFactory;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.springframework.stereotype.Component;

/**
 * @author: zhouwei
 * @version: v1.0
 * @description: com.cloud.service.backup
 * @date:2021-01-25
 */
@Component
public class UserServiceBackFactory implements FallbackFactory<UserService> {
    private UserServiceBack userServiceBack;

    public UserServiceBackFactory(UserServiceBack userServiceBack) {
        this.userServiceBack = userServiceBack;
    }

    @Override
    public UserService create(Throwable throwable) {
        System.out.println("异常信息" + ExceptionUtils.getFullStackTrace(throwable));
        return userServiceBack;
    }
}

3、UserServiceBack不变，访问效果不变控制台打印异常

异常信息java.lang.RuntimeException: com.netflix.client.ClientException: Load balancer does not have available server for client: service-hi
    at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:90)
    at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:119)
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89)
    at feign