Spring Cloud Alibaba添加熔断机制Sentinel

[!NOTE]

本篇内容需要在上一篇的基础上进行。

请找到上一篇的项目代码,本篇在上一篇的源代码上进行编写。

本系列教程目录:https://laisc7301.github.io/blog/2024/01/29/202401290001SpringBoot%E7%B3%BB%E5%88%97%E5%9F%BA%E7%A1%80%E6%95%99%E7%A8%8B/

打开上一个模块的源代码(my-consumer-feign),我们继续进行。

整个项目的文件结构如下图所示:

找到pom.xml文件,在<dependencies>标签里添加:

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

找到application.yml,在里面添加:

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feign:
sentinel:
enabled: true

其它文件的源代码:

FeignServiceFallback.java

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package org.laisc.consumer.feign.service.fallback;

import org.laisc.consumer.feign.service.FeignService;
import org.springframework.stereotype.Component;

@Component
public class FeignServiceFallback implements FeignService {

@Override
public String test(String message) {
return "test fallback";
}
}

FeignService.java

修改@FeignClient注解,最终变成下面这样:

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package org.laisc.consumer.feign.service;

import org.laisc.consumer.feign.service.fallback.FeignServiceFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(value = "my-provider", fallback = FeignServiceFallback.class)
public interface FeignService {
@GetMapping(value = "/test/{message}")
String test(@PathVariable("message") String message);
}

现在,关闭所有服务,只打开ConsumerFeignApplication,访问 http://localhost:9092/test/hi ,你就会看到:

test fallback

项目源代码下载:https://pan.baidu.com/s/1_g7WWmJCxtHVIW-UdGVqHQ?pwd=lnrk

上一篇:Spring Cloud Alibaba创建服务消费者Feign(负载均衡):https://laisc7301.github.io/blog/2024/01/28/202401280000SpringCloudAlibaba%E5%88%9B%E5%BB%BA%E6%9C%8D%E5%8A%A1%E6%B6%88%E8%B4%B9%E8%80%85Feign(%E8%B4%9F%E8%BD%BD%E5%9D%87%E8%A1%A1)/