Spring Cloud整合Sentinel

ゞ浴缸里的玫瑰 2021-09-08 10:56 352阅读 0赞

[**完整目录清单页面（必看）**][Link 1]

Spring Cloud Alibaba默认为Sentinel整合了Servlet、RestTemplate、 FeignClient和Spring WebFlux。它不仅补全了Hystrix在Servlet和RestTemplate这一块的空白，而且还完全兼容了Hystrix在FeignClient中限流降级的用法,并支持灵活配置和调整流控规则。

**第一步：新建sentinel-springcloud子模块项目，pom.xml添加`spring-cloud-starter-alibaba-sentinel`依赖**

<dependency>
    	<groupId>com.alibaba.cloud</groupId>
    	<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    </dependency>

**第二步：新建SentinelHelloWorldControllerc测试类**

package com.java1234.controller;
    
    
    import com.alibaba.csp.sentinel.annotation.SentinelResource;
    import com.alibaba.csp.sentinel.slots.block.BlockException;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    
    /** * @author java1234_小锋 * @site www.java1234.com * @company Java知识分享网 * @create 2021-05-04 14:35 */
    @RestController
    public class SentinelHelloWorldController { 
    
    
        /** * 注解方式定义资源 * @SentinelResource value 资源名称 * @SentinelResource blockHandler 调用被限流/降级/系统保护的时候调用的方法 * @return */
        @SentinelResource(value = "helloWorld_springcloud",blockHandler = "blockHandlerForHelloWorld3")
        @RequestMapping("helloWorld3")
        public String helloWorld3(){ 
            return "Sentinel 大爷你好！by 注解方式@SentinelResource"+System.currentTimeMillis();
        }
    
        /** * 原方法调用被限流/降级/系统保护的时候调用 * @param ex * @return */
        public String blockHandlerForHelloWorld3(BlockException ex) { 
            ex.printStackTrace();
            return "系统繁忙，请稍后！";
        }
    
    
    }

**第三步：`application.yml`配置本地项目接入Dashboard控制台**

spring:
      application:
        name: sentinel_springcloud  # 设置应用名称
      cloud:
        sentinel:
          transport:
            dashboard: localhost:8080 # 设置Sentinel连接控制台的主机地址和端口

**第四步：Sentinel Dashboard增加流控规则**

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**第五步：测试**

浏览器地址栏输入：http://localhost/helloWorld3

正常显示：

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如果频繁访问，则被流控

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[Link 1]: https://blog.csdn.net/caoli201314/article/details/116422933
[img-i6nerl9G-1624267108063_C_Users_java1234_AppData_Roaming_Typora_typora-user-images_image-20210621115320329.png]: /images/20210901/724697e0efab459781fca2bdfbc87f1a.png
[img-Atqn2c67-1624267108064_C_Users_java1234_AppData_Roaming_Typora_typora-user-images_image-20210621115522849.png]: /images/20210901/913d87e07752452a9feb9a72a09968e7.png
[img-amluljcE-1624267108065_C_Users_java1234_AppData_Roaming_Typora_typora-user-images_image-20210621115548434.png]: /images/20210901/77800c7b124a477193e49bfbdb73c199.png