spring cloud nacos 三 Sentinel的使用

spring cloud nacos 三 Sentinel的使用
一.Spring Cloud中使用Sentinel
1.在服务提供者pom.xml 加入 spring-cloud-starter-alibaba-sentine

		
            org.springframework.cloud
            spring-cloud-starter-alibaba-sentinel
            0.9.0.RELEASE
        

2.application.yml

server:
  port: 8762
  # 注意：下面注释了是因为 消费者可能会因为配置了context-path 而调用请求不到提供者的服务
 # servlet:
 #   context-path: /nacos-provider
spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
    sentinel:
      transport:
        port: 8719
        dashboard: localhost:8080

3.在controller中加入注解

package com.sunup.practice.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
public class ProviderController {
    @GetMapping("/hello")
    @SentinelResource(value="hello")
    public String hi(@RequestParam(value = "name", defaultValue = "nacos", required = false) String name) {
        log.debug(name);
        return "hello" + name;
    }
}

4启动sentinel 下载地址 https://github.com/alibaba/Sentinel/releases 我下载的1.6.2版本 启动 java -jar sentinel-dashboard-1.6.2.jar 访问 http://localhost:8080

5.在流控规则添加规则

6.然后重启服务提供者访问http://localhost:8761/hello 每秒多访问几次就会出现
Blocked by Sentinel (flow limiting)

二、在FeignClient中使用Sentinel
1.在消费者pom.xml 中加入

		
            org.springframework.cloud
            spring-cloud-starter-alibaba-sentinel
            0.9.0.RELEASE
        

2.application.yml添加配置

server:
  port: 8763
  # 注意：下面注释了是因为 消费者可能会因为配置了context-path 而调用请求不到提供者的服务
 # servlet:
 #   context-path: /nacos-consuer
spring:
  application:
    name: nacos-consuer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
    sentinel:
      transport:
        port: 8719
        dashboard: localhost:8080

feign.sentinel.enabled: true

3.还是添加规则

4.访问http://localhost:8763/helloFeign