Feign的基础应用(替代Eureka消费者)

不念不忘少年蓝@ 2022-12-21 03:17 95阅读 0赞

本篇接于[《SpringBoot：Eureka创建服务提供者》][SpringBoot_Eureka]。  
Demo项目结构如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]

*  pom文件

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

*  配置文件

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:20000/eureka/
    server:
      port: 40001
    spring:
      application:
        name: feign-consumer

*  application

@EnableDiscoveryClient
    @SpringBootApplication
    @EnableFeignClients
    public class FeignConsumerApplication { 
    
        public static void main(String[] args) { 
            new SpringApplicationBuilder(FeignConsumerApplication.class)
                    .web(WebApplicationType.SERVLET)
                    .run(args);
        }
    
    }

*  IService  
    重点就在这，我们通过`@FeignClient`注解声明serviceName，然后`@GetMapping`获取相应的服务

@FeignClient("eureka-client")
    public interface IService { 
    
        @GetMapping("/sayHi")
        String sayHi();
    
    }

*  最后新建一个测试类Controller

@RestController
    public class Controller { 
    
        @Autowired
        private IService service;
    
        @GetMapping("/sayHi")
        public String sayHi() { 
            return service.sayHi();
        }
    }

我们启动注册中心、Eureka client以及Feign，访问`localhost:4001/sayHi`，可以看到已经可以获取到服务了！

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center 1]

[SpringBoot_Eureka]: https://jiandansuifeng.blog.csdn.net/article/details/109364148
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/d83faf982f9a477baebc0cf4950642cf.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center 1]: https://img-blog.csdnimg.cn/20201114103037456.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0,size_16,color_FFFFFF,t_70#pic_center