添加依赖
org.springframework.cloud:spring-cloud-dependencies:Greenwich.SR3
‘org.springframework.cloud:spring-cloud-starter-consul-discovery’,
‘com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-config:2.1.2.RELEASE’
‘io.github.openfeign:feign-okhttp’,
‘org.springframework.cloud:spring-cloud-starter-openfeign’

nacos 配置

spring:
  profiles:
    active: local
  application:
    # TODO: 这里配置成实际工程的名字, 作为发布服务的ID.
    name: test-server
  main:
    allow-bean-definition-overriding: true
  cloud:
    consul:
      config:
        enabled: false
    nacos:
      config:
        server-addr: nacos2-offline.com:80
        enabled: true
        namespace: dev
        group: TEST_GROUP
        username: dev
        password: skLN2LsI/JC2yBtg
        file-extension: yml

consul配置

  cloud:
    config:
      override-none: true   // 本地配置覆盖远程
    consul:
      host: consul-dev-service
      port: 8500
      discovery:
        #prefer-ip-address: false
        healthCheckPath: /actuator/health
        healthCheckInterval: 15s
        hostname: 10.0.3.105
        port: 30039 

1.在启动类上添加 EnableFeignClients 制定扫描路径
添加依赖

@Slf4j
@EnableFeignClients({"com.test.api"})
@EnableDiscoveryClient
@SpringBootApplication
public class Application implements WebMvcConfigurer{

    public static void main(String[] args) {
        SpringApplication.run(DcJingdongProviderApplication.class, args);
    }

}

2.提供 controller

@RequestMapping("/api")
@RestController
public class ApiController {

    @ApiOperation(value = "测试")
    @PostMapping(value = "/test")
    public String test (@RequestBody TestDTO request) throws Exception {
     
        return "测试成功！！";
    }

}

4. 提供 远程调用接口

@FeignClient(name = "服务名称", path = "/eclp",fallback = TestServiceHystrix.class)
public interface TestServiceRemote {

    @RequestMapping(value = "/api/test", method = RequestMethod.POST,produces="application/json;charset=UTF-8")
    String test (@RequestBody TestDTO request);
}

5. 熔断器

@Slf4j
@Component
public class EclpServiceHystrix implements EclpServiceRemote {

    @Override
    public String test (TestDTO request) {
        log.info("服务降低！！");
        return "服务降低！！";
    }

}

6.服务使用者，只需在启动类添加@EnableFeignClients({“com.test.api”})

@Slf4j
@EnableFeignClients({“com.test.api”})
@EnableDiscoveryClient
@SpringBootApplication
public class Application implements WebMvcConfigurer{

public static void main(String[] args) {
    SpringApplication.run(DcJingdongProviderApplication.class, args);
}

}

客户端测试controller
在服务中注入 TestServiceRemote 直接使用即可

@Slf4j
@Api(value = "test测试 ", tags = "Test测试")
@RequestMapping("/test")
@RestController
public class TestController {

    @Autowired
    TestServiceRemote testServiceRemote ;
    
    @ApiOperation(value = "删除缓存的shopkey")
    @RequestMapping(value = "/test", method = RequestMethod.POST)
    public result queryPoOrder() {

        TestDTO testDto= new TestDTO ();

        String result = testServiceRemote .queryPoOrder(requestDTO);

        return  result ;
    }

引入依赖
‘org.springframework.cloud:spring-cloud-starter-openfeign’
‘io.github.openfeign:feign-okhttp’,

yml 配置文件

     feign:
       hystrix:
         enabled: true
       compression:
         request:
           enabled: true
           min-request-size: 2048
         response:
           enabled: true
       httpclient:
         enabled: true # 支持HttpClient的开关
         max-connections: 500 # 最大连接数
         max-connections-per-route: 100 # 单个路径的最大连接数
       client:
         config:
           default:
             loggerLevel: basic