Sentinel 整合SpringCloud的详细教程

<!--Sentinel 整合SpringCloud 的依赖-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-sentinel</artifactId>
    <version>2.2.0.RELEASE</version>
</dependency>

# 设置应用的名称
spring:
  application:
    name: springCloudSentinel
  cloud:
    sentinel:
      transport:
 
        #设置Sentinel控制台的主机地址和端口号
        dashboard: localhost:9000

@SentinelResource(value = "Sentinel_Cloud",blockHandler = "exceptionHandler")
@GetMapping("/sentinelCloud")
public String sentinelCloud(){
    //使用限流规则
    return "Sentinel_Cloud,成功调用";
}

/**
 * 定义降级 / 限流 的处理函数
 *
 * @param exception
 * @return
 */
public String exceptionHandler(BlockException exception) {
    exception.printStackTrace();
    return "Sentinel_Cloud,访问限流";
}

# 设置应用的名称
spring:
  application:
    name: springCloudSentinel
  cloud:
    sentinel:
      transport:
 
        #设置Sentinel控制台的主机地址和端口号
        dashboard: localhost:9000
 
# 开启 Sentinel 对 Feign 的支持
feign:
  sentinel:
    enabled: true

@GetMapping("/feignHello")
public String feignHello(){
    return feignClient.feignHello();
}

@FeignClient(contextId = "testFeignClient", value = "注册中心中服务的名称", fallback = FeignFallbackService.class)
public interface TestFeignClient {
 
   /**
    * OpenFeign 远程调用的方法
    *
    * @return
    */
   @GetMapping("/test/feignHello")
   String feignHello();
}

@Service
public class FeignFallbackService  implements TestFeignClient{
   @Override
   public String feignHello() {
      return "Feign 远程调用限流了";
   }
}