服务调用 OpenFeign

1.pom引入依赖

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

2.主启动类添加 @EnableFeignClients 注解

@SpringBootApplication
@EnableFeignClients
public class OrderFeignMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderFeignMain80.class, args);
    }
}

3.服务层创建 FeignService 接口并使用 @FeignClient 注解并指定调用的服务名

@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {

    @PostMapping("/payment/insert")
    CommonResult insertPayment(@RequestBody Payment payment);

    @GetMapping("/payment/getPayment/{id}")
    CommonResult getPaymentById(@PathVariable("id") Long id);

    @GetMapping("/payment/feign/timeout")
    String paymentTimeout();

    @GetMapping("/payment/feign/exception")
    String paymentException();
}

注意：这里的接口就和服务提供方的接口一致

4.Feign服务调用超时控制

ribbon:
  ReadTimeout: 5000
  ConnectTimeout: 5000

Feign底层是包含Ribbon的，所以超时控制交给Ribbon来做

注意：首字母是大写 ConnectTimeout ReadTimeout

5.Feign开启日志增强

@Configuration
public class FeignConfig {
    @Bean
    Logger.Level feignLoggerLevel(){
        return Logger.Level.FULL;
    }
}