一? 介紹說明

1.1 說明

1.1.1 消費者8081

1.1.2 openfegin接口

1.1.3 提供者9091

9091微服務滿足：

1 openfegin 配置fallback邏輯，作為統一fallback服務降級處理。

2.sentinel訪問觸發了自定義的限流配置，在注解@sentinelResource里面配置blockhandler方法。

二 實操案例

2.1 consumer案例配置

2.1.1 pom配置

        <!--alibaba-sentinel--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency><!--nacos-config--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><!-- 引入自己定義的api通用包 --><dependency><groupId>com.jurf.ms.api</groupId><artifactId>ms-api-commons</artifactId><version>1.0-SNAPSHOT</version></dependency>

2.1.2 業務代碼

    @Resourceprivate PayFeignSentinelApi payFeignSentinelApi;
//    @Autowired
//   private OpenFeginApi openFeingApi;@GetMapping(value = "/consumer/pay/nacos/get/{orderNo}")public ResultData getPayByOrderNo(@PathVariable("orderNo") String orderNo){return payFeignSentinelApi.getPayByOrderNo(orderNo);//   return openFeingApi.getPayByOrderNo(orderNo);}

2.1.3 配置文件

2.1.4?啟動配置

2.2?openfegin-api的配置

2.2.1 pom文件

    <!--openfeign--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><!--alibaba-sentinel--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency>

2.2.2?業務代碼

1.代碼接口： 注意這里要配置成訪問服務的服務名稱，和nacos的服務名一致。

/*** @auther zzyy* @create 2024-01-05 13:05*/
@FeignClient(value = "ms-alibaba-provider9091",contextId = "ms-alibaba-provider9091-1",fallback = PayFeignSentinelApiFallBack.class)
public interface PayFeignSentinelApi
{@GetMapping(value = "/pay/nacos/get/{orderNo}")public ResultData getPayByOrderNo(@PathVariable("orderNo") String orderNo);
}

2.fallback實現類

@Component
public class PayFeignSentinelApiFallBack implements PayFeignSentinelApi
{@Overridepublic ResultData getPayByOrderNo(String orderNo){return ResultData.fail(ReturnCodeEnum.RC500.getCode(),"對方服務宕機或不可用，FallBack服務降級o(╥﹏╥)o");}
}

2.3??提供配置

2.3.1 pom配置

    <!--openfeign--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><!--alibaba-sentinel--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency>

2.3.2?業務實現

    //openfeign+sentinel進行服務降級和流量監控的整合處理case@GetMapping(value = "/pay/nacos/get/{orderNo}")@SentinelResource(value = "getPayByOrderNo",blockHandler = "handlerBlockHandler")public ResultData getPayByOrderNo(@PathVariable("orderNo") String orderNo){//模擬從數據庫查詢出數據并賦值給DTOPayDTO payDTO = new PayDTO();payDTO.setId(1024);payDTO.setOrderNo(orderNo);payDTO.setAmount(BigDecimal.valueOf(9.9));payDTO.setPayNo("pay:"+ IdUtil.fastUUID());payDTO.setUserId(1);return ResultData.success("查詢返回值："+payDTO);}public ResultData handlerBlockHandler(@PathVariable("orderNo") String orderNo, BlockException exception){return ResultData.fail(ReturnCodeEnum.RC500.getCode(),"getPayByOrderNo服務不可用，" +"觸發sentinel流控配置規則"+"\t"+"o(╥﹏╥)o");}

2.3.3?配置

2.4? 服務啟動

1.nacos啟動

2.sentinel啟動

3.應用服務啟動

2.5?驗證訪問

1.消費者：?http://localhost:8081/consumer/pay/nacos/get/999

2.提供者：http://localhost:9091/pay/nacos/get/222

3.驗證blockhandler

a) sentinel配置

b)頻繁刷新訪問： 提示sentinel流控規則訪問

?4.驗證fallback

關閉9091服務提供者

再次訪問：提示fallback異常提示。