十二、Sentinel支持OpenFeign

Sentinel要支持OpenFeign,只需要以下两个步骤:

1、配置feign.sentinel.enabled=true

2、添加依赖:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

 

在Producer模块中定义资源:

@RestController
public class HelloProducer {
    @Value("${server.port}")
    private int port;

    @RequestMapping("/hello")
    public String  hello() {
        return "hello,Producer,port:" + port;
    }
}

 

首先在根项目的dependencyManagement中添加依赖:

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
        <version>3.1.6</version>
    </dependency>

 

其次在Consumer中添加依赖:

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>

在Consumer的application.properties配置:

feign.sentinel.enabled=true

在启动类加@EnableFeignClients。

 

增加feign接口:

@FeignClient(name = "producer", fallback = HelloFeignFallback.class, configuration = FeignConfiguration.class)
public interface HelloFeign {
    @RequestMapping("/hello")
     String  hello();
}

fallback属性是服务降级的处理。producer是Producer的服务名。

public class HelloFeignFallback implements HelloFeign {
    @Override
    public String hello() {
        return "hello fallback";
    }
}

public class FeignConfiguration {

    @Bean
    public HelloFeign helloFeign() {
        return new HelloFeignFallback();
    }
}

FeignConfiguration没加@Configuration注解。

在Controller加:

@Autowired
private HelloFeign helloFeign;

@RequestMapping("/call")
public String call() {
    return helloFeign.hello();
}

启动Consumer和Producer后,访问http://localhost:7001/consumer/call,看到hello,Producer,port:7000。关闭Producer服务,在调用,看到hello fallback。继续启动一个端口是7002的Producer服务,继续访问,发现hello,Producer,port:7000和hello,Producer,port:7002交替输出,实现了负载均衡。

posted @ 2023-07-05 21:17  shigp1  阅读(114)  评论(0编辑  收藏  举报