原創轉載請註明出處：https://www.cnblogs.com/agilestyle/p/15166657.html

package com.test.resilience4j.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import io.github.resilience4j.circuitbreaker.annotation.CircuitBreaker;
import org.apache.commons.lang.StringUtils;
import org.apache.dubbo.config.annotation.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 * springboot與resilience4j整合
 *
 * <dependency>
 *     <groupId>io.github.resilience4j</groupId>
 *     <artifactId>resilience4j-spring-boot2</artifactId>
 *     <version>1.7.1</version>
 * </dependency>
 *
 *
 * 需注意的地方：
 * 1、name = "cp-auth-web" 和resilience4j.circuitbreaker.instances.cp-auth-web.base-confi須一致
 * 2、@RequestMapping請求方法和fallbackMethod方法的引數須一致
 * 3、不能try...catch...捕獲異常

* @author nanfengxiangbei
* @date 2021-11-12
*/

@RequestMapping("/content")
@RestController
public class OttContentFallBackController {
    private static final Logger logger = LoggerFactory.getLogger(OttContentFallBackController.class);
    private static final Logger mockLog = LoggerFactory.getLogger("OttContentMockController");

    @Reference
    private IServiceProduct productService;

    @Reference(check = false, mock = "true")
    private IUnityAuthService unityAuthService;


    @RequestMapping(value = "/fallback")
    @CrossOrigin(origins = "*")
    @CircuitBreaker(name = "cp-auth-web", fallbackMethod = "fallbackTest")
    public String fallBack(@RequestBody OttProductContentReqVo reqVo, HttpServletRequest request, HttpServletResponse response) {

        OttContentRespVo respVo = new OttContentRespVo("cp同步內容到hd成功", "000");
        logger.debug("fallbackTest請求開始" + JSON.toJSONString(reqVo));

        ServiceProduct serviceProduct = productService.getServiceProductByProductCode(reqVo.getProductID());
        logger.debug("獲取產品資訊：" + JSON.toJSONString(serviceProduct));

        UnityAuth dorisDemo = new UnityAuth();
        dorisDemo.setContentId(reqVo.getContentID());
        dorisDemo.setProductCode(serviceProduct.getProductCode());
        dorisDemo.setCreateTime(new Date());
        dorisDemo.setRouteId(System.currentTimeMillis());
        dorisDemo.setAccount("136870000000");
        dorisDemo.setAllPass(0);
        dorisDemo.setResult(0);
        dorisDemo.setRouteEnd(System.currentTimeMillis());
        dorisDemo.setRequestBody(JSON.toJSONString(dorisDemo));

        // 呼叫服務降級dubbo
        String message = unityAuthService.add(dorisDemo);
        if (!StringUtils.isEmpty(message)) {
            mockLog.error(message);
        }
        return JSONObject.toJSONString(respVo);
    }

    /**
     * 當請求發生異常時，fallbackMethod裡指定呼叫此方法
     *
     * @param reqVo    請求引數
     * @param request  請求引數
     * @param response 響應引數
     * @param e        異常
     * @return 響應訊息
     */
    private String fallbackTest(@RequestBody OttProductContentReqVo reqVo,
                                HttpServletRequest request,
                                HttpServletResponse response,
                                RuntimeException e) {
        mockLog.error("resilience4j invoked with operation: " + reqVo.getAction() + ", \nexception:" + e);
        OttContentRespVo respVo = new OttContentRespVo("cp同步內容到hd成功", "000");
        return JSONObject.toJSONString(respVo);
    }
}