SpringCloud两种服务降级的方法

1.feign整合hystrix的降级

2.hystrix本身的降级

3.进行熔断的处理

package com.mcloud.nis.knowledge.feign;

import com.alibaba.fastjson.JSONObject;
import com.mcloud.nis.knowledge.feign.Impl.BasicSignFallBack;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * Created by 周建鹏
 * $ on 2019/10/18 $ 14:04
 * <p>
 * 调用体征基础服务信息
 */
第一种:
@FeignClient(name = "nis-signs", fallback = BasicSignFallBack.class) //依赖的服务
public interface BasicSignManager {
    /**
     * 获取生命体征的基础信息
     */
    @RequestMapping(value = "/confs/basics/signs", method = RequestMethod.GET)
    JSONObject getSignCode(@RequestParam String organCode);
}

package com.mcloud.nis.knowledge.feign.Impl;

import com.alibaba.fastjson.JSONObject;
import com.mcloud.nis.knowledge.constant.BizErrorCodeEnum;
import com.mcloud.nis.knowledge.feign.BasicSignManager;
import com.mcloud.nis.knowledge.service.impl.CatalogueLibraryServiceImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/**
 * Created by 周建鹏
 * $ on 2019/11/5 $ 17:55
 * <p>
 * 生命体征服务降级处理类,一定要实现服务类的接口
 * <p/>
 */
@Component
public class BasicSignFallBack implements BasicSignManager {

    private static Logger logger = LoggerFactory.getLogger(BasicSignFallBack.class);

    @Override
    public JSONObject getSignCode(String organCode) {
        logger.warn("生命体征接口的降级处理:{}", JSONObject.toJSONString(organCode));
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "10001");
        jsonObject.put("error", BizErrorCodeEnum.NO_SERVICE);
        return jsonObject;
    }
}
第二种:

@ApiOperation(value = "获取生命体征", notes = "获取生命体征")
@ResponseBody
@GetMapping(value = "/getBasicSign")
@HystrixCommand(fallbackMethod = "getBasicSignByError")
public ServiceResult getBasicSign(@RequestParam String code) {
    try {
        CheckParameterUtls.checkNotNull(code, BizErrorCodeEnum.PARAMETER_IS_NULL);
        JSONObject signCode = basicSignManager.getSignCode(code);
        return ServiceResult.success(signCode);
    } catch (BizException e) {
        return ServiceResult.fail(e.getErrorCode().getErrorCode(), e.getErrorCode().getDescription());
    }
}

//https://blog.csdn.net/HUXU981598436/article/details/89316880
private ServiceResult getBasicSignByError(String code) {
    logger.info("生命体征入口controller中的降级方法:{}", JSONObject.toJSONString(code));
    JSONObject jsonObject = new JSONObject();
    jsonObject.put("code", code);
    jsonObject.put("error", BizErrorCodeEnum.NO_SERVICE.getDescription());
    return ServiceResult.fail(Integer.parseInt(BizErrorCodeEnum.NO_SERVICE.getErrorCode()), BizErrorCodeEnum.NO_SERVICE.getDescription(), jsonObject);
}

最后

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